JP7483515B2 - A measuring device for measuring the liquid phase flow conditions - Google Patents

Description

The present invention relates to a measuring device that measures the flow conditions of the liquid phase. More specifically, the present invention relates to a measuring device that measures the flow conditions of the liquid phase, which is useful when the measurement target is a two-phase fluid in which gas and liquid flow together, for example in a nuclear power plant or a chemical plant.

Understanding the flow conditions of cooling water and solutions in nuclear reactors and chemical plants (mainly velocity distribution in the liquid phase and the proportion of gas and liquid, etc.) is essential for plant design. In order to optimize such design, it is necessary to accurately understand the flow conditions of cooling water and solutions. To accurately understand the flow conditions of cooling water and solutions, it is necessary to collect information on the liquid and gas phases at as many points as possible within a cross section perpendicular to the direction of fluid flow.

Measurements of the liquid phase flow field typically involve techniques such as injecting tracer particles into the flow and visualizing it with laser light. For example, particle imaging velocimetry (PIV) is known as a measurement technique for obtaining time series information on the amount of gas and liquid present in a gas-liquid two-phase flow at multiple points within a cross section of the fluid (Non-Patent Document 1). PIV is a technique for measuring the velocity field of a fluid by dispersing fluorescent particles in the fluid, irradiating the fluid with a laser that induces fluorescence, and capturing images of the fluorescent particles moving with the flow using a camera. With PIV, the presence rate of gas and liquid can also be measured simultaneously through image analysis, as the images are captured using a camera.

As a means of measuring the flow conditions of bubbles in the liquid phase, there is also a technology (called a wire mesh sensor) in which parallel wire groups are arranged in two layers so that they intersect along a plane perpendicular to the axis of the pipe through which the fluid to be measured flows, and the difference in conductance between the gas phase (bubbles) and the liquid phase is used to capture the size and flow of air bubbles, for example, on the gas phase side of a gas-liquid two-phase flow (Non-Patent Document 2). For example, a wire group parallel to the X axis and a wire group parallel to the Y axis are arranged in two layers, with one of the wire groups being the transmitting side wires (called the transmitter side wires) and the other wire group being the receiving side wires (called the receiver side wires), stretched across the cross section of the flow path so that they are perpendicular to each other.

Raffel, M. et al. Particle image velocimetry: a practical guide. (Springer, 2007). Report of the Central Research Institute of the Electric Power Industry, Report No. L10003, Evaluation of the influence of wire mesh sensors on the flow field and the scope of application, May 2011

However, PIV is limited to cases where an optical field of view is ensured, and cannot be applied to measuring fluids flowing inside pressure vessels under high temperature and pressure conditions, such as nuclear reactors or chemical plants, where an optical path (such as a sight glass) cannot be installed. Furthermore, even for fluids at room temperature and pressure, it cannot be applied in environments where the fluid flows inside opaque pipes or vessels and an optical path cannot be established.

The wire mesh sensor in Non-Patent Document 2 can also measure the two-dimensional distribution of the gas phase abundance ratio in the liquid phase from the gas phase flow in a gas-liquid two-phase flow, but it can only indirectly estimate the liquid phase flow conditions by measuring the gas phase situation (such as the flow of bubbles), and cannot measure the flow conditions of a single-phase fluid consisting of only the liquid phase.

In environments where an optical path cannot be established, such as under high temperature and pressure conditions, none of the measurement methods can directly measure the flow conditions of the liquid phase in a gas-liquid two-phase flow. In other words, the flow conditions of the liquid phase cannot be measured directly, and can only be indirectly inferred from the flow of the gas phase. In addition, there is no measurement device that can directly and accurately measure the flow conditions of both the liquid and gas phases in real time at as many points as possible within a cross section perpendicular to the main flow direction of a gas-liquid two-phase fluid.

The present invention aims to provide a measuring device that can directly measure the flow conditions of the liquid phase.

To achieve this objective, a measuring device for measuring the flow conditions of the liquid phase includes a two-layer wire group arranged to cross each other at a fixed interval so as to be perpendicular to the main flow of the fluid containing the liquid phase to be measured, an external magnetic field applying device that applies a time-varying magnetic field to the two-layer wire group and the fluid to be measured between them outside the flow path of the fluid, and a processing device that obtains speed information of the crossflow of the liquid phase based on the electromotive force generated between the crossover parts of each wire output from the two-layer wire group, and is designed to directly obtain the flow velocity field of the crossflow of the liquid phase in the fluid as a spatial distribution.

Here, it is preferable that the external magnetic field applying device is an electromagnet, and at least two pairs are arranged in a direction perpendicular to the flow path, and the direction of the magnetic flux is periodically and alternately switched to apply the magnetic flux, so that electromotive forces associated with the velocity components of the crossflow of the liquid phase in two perpendicular directions are alternately and continuously obtained.

It is also preferable to use one of the two layers of wires as a transmitter side wire and the other as a receiver side wire, and transmit an arbitrary signal to each wire of the transmitter side wire with a lag time so that a certain delay time occurs between all of the wires, and to detect the electrical conductivity between the wires at the intersection with the receiver side wire, and to simultaneously obtain information regarding the amount of multiple types of substances with different impedances from the change in electrical conductivity.

Furthermore, it is preferable that the signal sent through the wire is a bipolar signal.

Furthermore, it is preferable that the fluid to be measured is a gas-liquid two-phase flow.

The method for measuring the flow conditions of the liquid phase according to the present invention involves arranging two layers of wire groups so that they cross each other at a fixed interval so as to be perpendicular to the main flow of the fluid containing the liquid phase to be measured, applying a time-varying external magnetic field to the two layers of wire groups and the fluid to be measured between them, and obtaining information on the crossflow speed of the liquid phase from the electromotive force generated between the crossing points of each wire obtained from the two layers of wire groups.

Here, it is preferable to alternately and continuously obtain electromotive forces associated with the velocity components of the liquid phase crossflow in two perpendicular directions by periodically alternating the direction of the magnetic flux of the external magnetic field between two perpendicular directions.

In addition, the measurement method for measuring the flow conditions of the liquid phase according to the present invention preferably uses one of a two-layer wire group as a transmitter side wire and the other as a receiver side wire, and transmits an arbitrary signal to each wire of the transmitter side wire with a shift so that a certain delay time occurs between all of the wires, while detecting the electrical conductivity between the wires at the intersection portion with the receiver side wire, and simultaneously obtaining information regarding the amount of multiple types of substances with different impedances from the change in electrical conductivity.

Here, it is preferable that the signal sent through the wire is a bipolar signal.

Furthermore, it is preferable that the fluid to be measured is a gas-liquid two-phase flow.

The present invention makes it possible to directly and accurately measure the flow conditions of the liquid phase at many points in a cross section perpendicular to the main flow direction of the fluid being measured in real time, whether it is a single liquid phase or a gas-liquid two-phase flow.

1 is a principle diagram illustrating an embodiment of a liquid-phase flow condition measuring device of the present invention. FIG. 1A and 1B are diagrams for explaining the principle of the liquid-phase flow condition measuring device of the present invention, in which (A) is a diagram showing the principle, (B) is an explanatory diagram showing the relationship between vertical wires and horizontal wires, (C) is a diagram showing Faraday's electromagnetic dielectric law when magnetic field pattern 2 is used, and (D) is an explanatory diagram showing Faraday's electromagnetic dielectric law when magnetic field pattern 1 is used. FIG. 11 is an explanatory diagram showing another embodiment of the wire mesh sensor. FIG. 11 is an explanatory diagram showing still another embodiment of the wire mesh sensor. 4 is an explanatory diagram illustrating the relationship between the input signal, the output signal, and air bubbles of the wire mesh sensor. FIG.

The configuration of the present invention will be described in detail below based on the embodiment shown in the drawings.

1 shows an embodiment of the liquid-phase flow condition measuring device of the present invention. The liquid-phase flow condition measuring device according to this embodiment includes two layers of wire groups 2 and 3 arranged at a constant interval to cross each other at a three-dimensional intersection (i.e., they do not cross on the same plane perpendicular to the main flow but cross each other in the direction of the main flow) so as to be perpendicular to the main flow of the fluid including the liquid phase 7 to be measured, an external magnetic field applying device 8 that applies a magnetic field to the two layers of wire groups 2 and 3 and the fluid 7 to be measured between them outside the flow path 1, and a calculation processing device 9 that obtains velocity information of the cross flow of the liquid phase 7 based on electromotive force E (E ₁ , E ₂ , E ₃ , ..., E _n ) generated between three-dimensional intersection parts 11 of the wires 2', 3' output from the two layers of wire groups 2 and 3, and directly obtains the flow velocity field of the cross flow of the liquid phase 7 in the fluid as a spatial distribution.

In other words, the device is equipped with a lattice-shaped sensor (hereinafter such a structure is referred to as a wire mesh sensor 4) consisting of two layers of wire groups 2 and 3 arranged at a regular interval in the mainstream flow direction of the fluid containing the liquid phase 7 to be measured, i.e., liquid alone or a gas-liquid two-phase flow, and an external magnetic field device 8 that applies a time-varying magnetic field (hereinafter referred to as an external magnetic field) from outside the wire mesh sensor 4, and applies an external magnetic field to the wire mesh sensor 4 and the flow field of the fluid/liquid phase to be measured between it, detects the induced electromotive force E ( _E1 , _E2 , _E3 , ..., _En ) generated between the wires 2' and 3' at the three-dimensional intersection of the wire mesh sensor 4, and determines the flow velocity with a calculation processing device 9 not shown.

In the principle diagram of FIG. 2, for example, the two-layer wire groups 2 and 3 are arranged in two layers, with the wire group 2 parallel to the X-axis and the wire group 3 parallel to the Y-axis, strung perpendicular to the main stream 12 of the fluid/liquid phase 7 to be measured at regular intervals in the flow direction, and crossing in the direction of the main stream 12 to form a three-dimensional intersection 11 (where the wires cross in the direction of the main stream without crossing on a plane perpendicular to the main stream flow) toward the flow direction of the main stream 12. For example, in the case of this embodiment, the parallel wire groups 2 and 3 are arranged in two layers so that they cross each other at regular intervals along the plane perpendicular to the axis of the pipe 1 through which the fluid 7 to be measured flows.

Here, it is preferable that wires 2' and 3' are thin metal wires that do not significantly disturb the flow and are arranged at an appropriate interval. For example, in the case of this embodiment, the wire spacing is 3.5 mm and the wire diameter is 0.25 mm to minimize the effect on the two-phase flow, but it goes without saying that these values are not particularly limited.

In this embodiment, the two-layer wire groups 2, 3 are shown as an example of wires stretched across the cross section of the flow path so as to intersect at right angles, as shown in Figures 1 and 2. However, this is not particularly limited to a mesh structure, and any wires may be used as long as they have an intersecting positional relationship (i.e., a relationship in which the three-dimensional intersection parts 11 are distributed). For example, they may be arranged to intersect diagonally as shown in Figure 3, or in some cases, a combination of multiple circular wires and radially arranged wires as shown in Figure 4 may be used.

Further, an external magnetic field applying device 8 that applies an external magnetic field is provided outside the wire mesh sensor 4. For example, an electromagnet 8 that applies an external magnetic field is arranged outside the pipeline 1, i.e., outside the wire mesh 4. As the external magnetic field, it is necessary to alternately apply (vary) magnetic flux in at least two linearly independent axial directions. That is, since the velocity (two components) is in a two-dimensional plane, at least two linearly independent magnetic fluxes are required. In the case of this embodiment, two sets of electromagnets are arranged so as to be perpendicular to each other. In the case of a circular pipe flow path as shown in FIG. 1, for example, electromagnets are arranged at 90° intervals, and the first magnetic field pattern 5 and the second magnetic field pattern 6 are arranged so as to be applied alternately. The switching timing of these two sets of electromagnets is not limited to a specific period, but is arranged so as to be alternately magnetized, for example, at a period of a commercial frequency (50 Hz or 60 Hz). By periodically and continuously applying magnetic flux in two linearly independent axial directions alternately, electromotive forces E (E ₁ , E ₂ , E ₃ , ..., E _n ) in two directions are obtained at the same time. This makes it possible to output electromotive forces E (E ₁ , E ₂ , E ₃ , . . . , E n ) of the Vy and Vx components of the cross flow (a horizontal flow when the flow direction of the main flow 12 is taken as the vertical direction) ₁₃ .

Here, it is possible to provide three or more linearly independent magnetic fluxes, i.e., three pairs of electromagnets could be placed around the pipeline, for example, at intervals of 120° (60° for one unit electromagnet); however, in this case, the third magnetic flux would be excessive in terms of the measurement principle, and so it is assumed to play an auxiliary role (such as improving measurement accuracy), but this is not denied.

The number of velocity components that can be measured increases according to the number of external magnetic fields. In this embodiment, the velocity to be measured is a two-dimensional vector quantity, so the applied magnetic flux must be linearly independent. However, the magnetic flux in the two axial directions does not necessarily need to be orthogonal.

According to the liquid-phase flow condition measuring device of this embodiment, a time-varying external magnetic field is applied to the two-layer wire group 2, 3 and the fluid to be measured between them, and an induced electromotive force E (E ₁ , E ₂ , E ₃ , ..., E _n ) is generated in a direction that cancels the change in magnetic flux with the movement of the liquid regarded as a conductor (Lenz's law). If the fluid is fast, the conductor is moved quickly, so the induced electromotive force E (E ₁ , E ₂ , E ₃ , ..., E _n ) becomes large, and if there is no flow velocity, the movement of the conductor is stopped, so the induced electromotive force E (E ₁ , E ₂ , E ₃ , ..., E _n ) becomes 0. In other words, the magnitude of the induced electromotive force E (E ₁ , E ₂ , E ₃ , ..., E _n ) is proportional to the speed at which the liquid phase moves (flow velocity). The voltage difference (electromotive force E (E ₁ , E ₂ , E ₃ , . . . , E _n )) is taken out from one of the wire groups (for example, the receiver side wire 2).

Here, the change in velocity of the fluid can be expressed as an electromotive force according to Faraday's law of electromagnetic induction, as shown in Equation 1.
E = k × D × B × v (Equation 1)
where E is the induced electromotive force,
k is a parameter (constant)
D is the spacing between the meshes
B is the magnetic flux density
v is the liquid flow velocity.

In other words, the liquid phase flow condition measuring device of this embodiment is a measurement system that detects the movement of the liquid 7, which is regarded as a conductor, as induced electromotive force E ( _E1 , _E2 , _E3 , ..., _En ) generated between the wires 2', 3' at each three-dimensional intersection portion 11 of the wire mesh sensor 4, and then calculates the above-mentioned equation 1 using an arithmetic processing device 9, such as a microcomputer or a personal computer, to convert it into the liquid phase flow velocity.

According to the measuring device of this embodiment configured as described above, the induced electromotive force E (E1, E2, E3, ..., _En ) caused by the crossflow 13 of the liquid 7, which is generated by applying an external magnetic field by operating _an external magnetic field generating device ₈ , for example _an electromagnet, is measured at multiple points at each three-dimensional intersection portion 11 of the wire mesh sensor 4, and flow velocity field information in the liquid phase can be obtained as a spatial distribution.

That is, each of the three-dimensional intersections 11 of the wire groups 2 and 3 arranged in two layers locally becomes two electrodes. Since the liquid/liquid phase flowing between the two electrodes is a conductor, when an external magnetic field is applied, an electromotive force E (E ₁ , E ₂ , E ₃ , ..., E _n ) is generated according to Faraday's law. Therefore, the induced electromotive force E (E ₁ , E ₂ , E ₃ , ..., E _n ) is detected as a voltage difference from the wire groups 2 and 3 arranged in two layers. Here, using Faraday's law of electromagnetic induction, the flow velocities v x and v y of the liquid crossflow 13 can be obtained from the electromotive forces E (E ₁ , E ₂ , E ₃ , ..., E _n ) generated between the wires 2 _' and ₃ ' of each three-dimensional intersection 11 according to the speed of the liquid flow (considered to be the movement of a conductor) that interlinks with the external magnetic field/magnetic flux (see FIG. 2). Since the intersections 11 formed between the two layers of wire groups 2 and 3 are distributed two-dimensionally, the induced electromotive forces E ( _E1 , _E2 , _E3 , ..., _En ) are also measured at multiple points, and the flow velocity field in the liquid phase can be obtained as a spatial distribution. This makes it possible to obtain information on the velocity field of the horizontal flow (cross flow) parallel to the cross section perpendicular to the flow of the main flow 12, i.e., the velocity field and flow conditions of the cross flow 13.

The measurement method of this embodiment does not require an optical path and can detect flow conditions even in invisible environments. In other words, since it is possible to measure the liquid phase flow conditions in an environment where the fluid itself is invisible (including water and opaque liquids), there is no need to install an optical path (such as a sight glass), so it can be applied not only to the measurement of fluids flowing inside pressure vessels under high temperature and pressure conditions such as nuclear reactors and chemical plants, but also to the measurement of liquid phase flow conditions in environments where an optical path cannot be set, such as fluids at room temperature and pressure flowing inside opaque pipelines or vessels.

In addition, in the liquid phase flow condition measuring device of the above embodiment, one of the wire groups of the wire mesh sensor 4 is used as the transmitting side wire group (referred to as the transmitter side wire group 3) and the other wire group is used as the receiving side wire group (referred to as the receiver side wire group 2). For example, as shown in FIG. 5, if a certain delay time is given to each wire of the transmitter side wire group 3 called an excitation electrode and an arbitrary signal, for example a rectangular wave (pulse signal 14), is sent out, the conductance is different between the bubble (gas phase) 10 and the liquid phase 7. For example, when the gas phase (e.g., the bubble 10) passes between the wires 2', 3' of the three-dimensional intersection portion 11 of the wire mesh, the electrical conductivity between the wires 2', 3' changes, which affects the electrical signal 15 extracted from the receiver side wire group 2. In other words, the impedance between the wires 2', 3' at each three-dimensional intersection portion 11 changes with the passage of the bubble 10, causing a voltage drop and dulling the signal waveform, so that information on the gas phase and bubbles can be obtained from the receiver side wire group 2. This allows the two-dimensional distribution of the presence or absence of bubbles, in other words the amount of gas and liquid present, to be measured at high speed and with high spatial resolution from the change in electrical conductivity at the nearby point where the wires 2' and 3' cross. In other words, it is possible to realize two-dimensional distribution measurement of the amounts of multiple types of substances with different impedances, such as the gas phase and the liquid phase.

Specifically, when a rectangular wave signal, for example, is sent from the transmitter side wire group 3, if an air bubble 10 is present at the intersection 11 with the receiver side wire group 2, a signal with a voltage drop (distorted waveform) is detected, whereas if a liquid phase 7 is present, a signal without a voltage drop (a clean waveform with no distortion) is detected.

In addition, since it is known in advance what kind of signal is being sent from the signal sending side, i.e., the transmitter side wire group 3, it is possible to obtain information on the gas phase and bubbles by observing the signal from the output side, i.e., the receiver side wire group 2.

At the same time, by applying an external magnetic field to the flow field including the wire mesh sensor 4, an electromotive force E ( _E1 , _E2 , E3, ..., _En ) is generated between the wires 2', 3' of each three-dimensional intersection 11 of the wire mesh sensor 4. The induced electromotive force E ( _E1 , _E2 , _{E3 ,} ..., _En ) caused by the liquid phase flow can be measured at multiple points. The induced electromotive force E ( _E1 , _E2 , _E3 , ..., _En ) of each three-dimensional intersection 11 is output from the receiver side wire group 2 as a voltage difference.

According to the measurement device of the present embodiment, by continuously applying signals to all transmitter side wires with a certain delay time while applying external magnetic fields alternately in two orthogonal axial directions at least linearly independent, it is possible to simultaneously measure in real time the velocity field of the conductive material phase and the amount of conductive material phase and non-conductive material (material that is non-conductive compared to the conductive material phase ) in a fluid containing multiple types of material phases with different impedances, for example, the velocity field of the liquid phase and the amount of gas and liquid present. In this case, the signal flowing through the receiver side wire and the electromotive force E (E ₁ , E ₂ , E ₃ , ..., E _n ) are acquired in a superimposed form. Therefore, by appropriately separating and processing the signal output from the receiver side wire, the flow conditions of the liquid phase and the gas phase in the gas-liquid two-phase flow, for example, the amount of gas and liquid present and the velocity distribution in the liquid phase, can be properly measured in real time.

Here, the signal given to the transmitter side wire group 3 is preferably a bipolar signal. A bipolar signal is a signal that has a single waveform with symmetrical positive and negative shapes. When this signal is given, for example, when an air bubble passes, the signal becomes smaller with approximately positive and negative symmetry. On the other hand, when the liquid phase flows in a certain direction, the direction of the voltage generated between the wires 2', 3' of each intersection 11 does not depend on the positive and negative of the input signal, so a signal that is not symmetrical in positive and negative can be received. From the differences in the characteristics of these received waveforms, it is possible to distinguish between signals caused by the gas phase and signals caused by the liquid phase.

Furthermore, when acquiring a signal in the form of a superposition of a signal caused by a change in conductance (e.g., the passage of a bubble) and a signal caused by a change in electromotive force E ( _E1 , _E2 , _E3 , ..., _En ) accompanying a change in the flow velocity of the liquid phase, there is a concern that one of the signals may be buried if the range of the signal voltages is significantly different. In that case, it is also possible to measure substantially simultaneously in a form in which the signals are separated by instantly alternately switching between the application of an external magnetic field and the application of a signal to the transmitter-side wire group 3 using a circuit, that is, by alternately switching from gas-liquid abundance measurement → liquid-phase velocity field measurement → gas-liquid abundance measurement → ... In this case, no signal flows through the transmitter-side wire group 3 when the external magnetic field is applied, and no external magnetic field is applied when a signal is applied to the transmitter-side wire group 3.

The above-mentioned embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto and can be modified in various ways without departing from the gist of the present invention. For example, in the above-mentioned embodiment, the collection of information on the velocity distribution in the liquid phase and the amount of a plurality of types of substances in the crossflow 13 when the flow direction of the main flow 12 of the liquid to be measured is vertical, is mentioned, but this is not particularly limited thereto, and by changing the arrangement of the wire mesh sensor 4 and the external magnetic field device 8, information on the liquid phase such as the velocity field of a swirl flow, and flow changes due to turbulence or obstacles can be obtained, and it goes without saying that it can also be applied to the analysis of vortices and the merging or splitting of bubbles caused by the flow speed of the liquid phase.

In addition, in the above-described embodiment, the flow conditions of a liquid phase or a gas-liquid two-phase fluid are measured primarily by measuring the induced electromotive force E ( _E1 , _E2 , _E3 , ..., _En ), so that no optical path is required and the crossflow velocity field of a flow flowing inside a non-transparent container or pipeline is measured. However, it goes without saying that this is not particularly limited and it is also possible to measure the velocity field of a swirl flow inside an open flow path or container.

In addition, because flow velocity field information in the liquid phase is obtained as a spatial distribution using Faraday's law of electromagnetic induction, any fluid that is conductive can be used as the measurement target.Furthermore, the measurement principle does not require the presence of multiple phases of substances with different impedances, such as air bubbles, meaning that it is possible to measure the liquid phase flow conditions of a single-phase fluid that contains only the liquid phase.

In addition, in the above embodiment, an example is described in which an electromagnet 8 is used as an external magnetic field applying device, but this is not particularly limited, and a permanent magnet may be used to apply a time-varying magnetic field to the fluid to be measured. For example, although not shown, a permanent magnet may be installed on a rotating table with a hole in the center for passing a flow path/pipe so as to form a magnetic field across the fluid, or a magnetized ring-shaped permanent magnet may be installed so as to form a magnetic field across the fluid, and these may be rotated around the flow path to alternately apply magnetic flux in at least two linearly independent axial directions. In addition to rotating around the flow path/pipe, a permanent magnet may be rotated around an axis parallel to a tangent to the outer peripheral surface of the flow path/pipe to periodically and continuously apply magnetic flux in two linearly independent axial directions alternately. For example, a first magnetic field pattern 5 and a second magnetic field pattern 6 may be applied alternately by rotating permanent magnets arranged at 90° intervals.

1. Flow path (pipe)
2. One wire group (receiver side wire group)
2' One wire (receiver wire)
3. The other wire group (transmitter side wire group)
3' The other wire (transmitter side wire)
4 Wire mesh sensor 5 First magnetic field pattern 6 Second magnetic field pattern 7 Liquid/liquid phase as a fluid to be measured 8 External magnetic field application device (electromagnet)
9 Processing device 10 Gas phase (bubbles)
11 Intersection 12 Main flow 13 Cross flow 14 Signal (pulse signal) transmitted from transmitter side wire group
15 Signal output from receiver wire group

Claims (10)

Two layers of wires are arranged at regular intervals so as to cross each other at right angles to a main flow of a fluid containing a liquid phase to be measured;
an external magnetic field applying device that applies a time-varying magnetic field to the two layers of wires and the fluid to be measured between them, outside the fluid flow path;
a processor for obtaining speed information of the cross flow of the liquid phase based on electromotive forces generated between crossover portions of each of the wires output from the two layers of wire groups,
A measuring device for measuring the flow conditions of a liquid phase, characterized by directly determining the flow velocity field of the cross flow of the liquid phase in a fluid as a spatial distribution. The measurement device for measuring the flow conditions of the liquid phase according to claim 1, characterized in that the external magnetic field application device is an electromagnet, and at least two pairs are arranged in a direction perpendicular to the flow path, and the direction of the magnetic flux is periodically alternated to obtain electromotive forces associated with the velocity components of the crossflow of the liquid phase in two perpendicular directions alternately. The measuring device according to claim 1 or 2, characterized in that one of the two layers of wires is used as a transmitter side wire and the other is used as a receiver side wire, and an arbitrary signal is transmitted to each wire of the transmitter side wire with a shift so that a certain delay time occurs between all of the wires, and the electrical conductivity between the wires at the intersection part is detected by the receiver side wire, and information regarding the amount of multiple types of substances with different impedances is simultaneously obtained from the change in electrical conductivity. The measurement device according to claim 3, characterized in that the signal applied to the wire is a bipolar signal. The measurement device according to any one of claims 1 to 4, characterized in that the fluid to be measured is a gas-liquid two-phase flow. Two layers of wires are arranged so that they cross each other at a constant interval and are perpendicular to the main flow of the fluid containing the liquid phase to be measured,
A time-varying external magnetic field is applied to the two layers of wires and the fluid to be measured therebetween;
A method for measuring the flow conditions of a liquid phase, characterized in that velocity information of the crossflow of the liquid phase is obtained from the electromotive force generated between the three-dimensional intersections of each wire from the two layers of wire groups. The method for measuring the flow conditions of the liquid phase described in claim 6, characterized in that the direction of the magnetic flux of the external magnetic field is periodically alternated between two perpendicular directions, thereby alternately and continuously acquiring electromotive forces associated with the velocity components of the crossflow of the liquid phase in two perpendicular directions. A method for measuring a liquid phase flow condition according to claim 6 or 7, characterized in that one of the two layers of wire groups is used as a transmitter side wire and the other is used as a receiver side wire, and an arbitrary signal is transmitted to each wire of the transmitter side wire with a shift so that a certain delay time occurs between all of the wires, and the electrical conductivity between the wires at the intersection part is detected by the receiver side wire, and information regarding the amount of multiple types of substances with different impedances is simultaneously obtained from the change in electrical conductivity. A method for measuring the flow condition of a liquid phase according to any one of claims 6 to 8, characterized in that the signal applied to the wire is a bipolar signal. A method for measuring the flow condition of a liquid phase according to any one of claims 6 to 9, characterized in that the fluid to be measured is a gas-liquid two-phase flow.

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