CN217058486U - Pyramid-type combined reinforced heat transfer pipe with built-in hollow vortex generator - Google Patents
Pyramid-type combined reinforced heat transfer pipe with built-in hollow vortex generator Download PDFInfo
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- CN217058486U CN217058486U CN202123001390.9U CN202123001390U CN217058486U CN 217058486 U CN217058486 U CN 217058486U CN 202123001390 U CN202123001390 U CN 202123001390U CN 217058486 U CN217058486 U CN 217058486U
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- heat transfer
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- transfer pipe
- vortex generator
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract description 11
- 238000005728 strengthening Methods 0.000 abstract 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 108010074506 Transfer Factor Proteins 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model relates to a heat-transfer pipe is reinforceed in pyramid combination of built-in cavity vortex generator, wherein include: pyramid-shaped enhanced heat transfer tube and hollow vortex generator. The reinforced heat transfer pipe is formed by stamping a smooth round heat transfer pipe, and then forming concave-convex pyramid rough elements on the inner surface and the outer surface of the heat transfer pipe, wherein the pyramid rough elements are uniformly arranged along the circumferential direction and the axial direction of the heat transfer pipe. The design of stamping pyramid-shaped rough elements on the surface of the smooth round heat transfer pipe expands the heat transfer area of the heat transfer pipe, and enables fluid in the pipe to generate the speed perpendicular to the main flow direction, thereby being beneficial to strengthening heat transfer. The hollow vortex generator embedded in the heat transfer pipe can induce and generate secondary flow with larger intensity, and destroy a flow boundary layer and a thermal boundary layer on the wall surface of the heat transfer pipe. The expansion heat transfer area and the placement of the turbulence element are combined to play a role in combining and strengthening heat transfer.
Description
Technical Field
The utility model relates to a pyramid type combined reinforced heat transfer pipe with a built-in hollow vortex generator.
Background
The pyramid combined enhanced heat transfer pipe with the built-in hollow vortex generator can be applied to the industries of chemical industry, food, vehicles and the like, is particularly suitable for fluid working media with high viscosity and low Reynolds number, is mainly used for a shell-and-tube heat exchanger, and has the enhanced heat transfer principle of increasing the heat transfer area, generating secondary flow, enhancing fluid disturbance, increasing resistance properly, simultaneously greatly improving heat transfer performance and fully utilizing the enhanced heat transfer principle. The pyramid-shaped combined reinforced heat transfer pipe with the built-in hollow vortex generators comprises two elements, namely a pyramid-shaped heat transfer pipe and a hollow vortex generator.
The utility model discloses an aim at overcoming current intensive heat transfer technique not enough, through combining pyramid heat-transfer pipe and hollow vortex generator together, prepare out the two-way intensive combination heat exchange tube that heat transfer efficiency is high and use extensively.
SUMMERY OF THE UTILITY MODEL
In view of the disadvantages of the prior tubular heat exchanger, the invention aims to provide a pyramid-type combined enhanced heat transfer pipe with a built-in hollow vortex generator. The reinforced heat transfer principle of the reinforced heat exchange tube is that concave-convex alternating pyramid rough elements are formed on a tube body in a machining mode, the heat transfer area of the heat exchange tube is enlarged, meanwhile, the bidirectional reinforced heat transfer effect is achieved, on the basis, the hollow vortex generator is arranged in the tube, because the hollow vortex generator can continuously destroy a heat boundary layer and a flowing boundary layer at the position of the tube wall, the convective heat transfer between the tube wall and fluid is enhanced, compared with a twisted band, the hollow vortex generator can effectively reduce the resistance of the fluid, and the hollow vortex generator and the fluid are combined into the combined reinforced heat transfer tube.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
a pyramid reinforced heat-transfer pipe is designed, i.e. pyramid rough elements are formed on the surface of the pipe by rolling treatment on the smooth circular pipe wall. The method is characterized in that: the pyramid-shaped reinforced heat transfer pipe is characterized in that concave-convex pyramid-shaped rough elements are punched on the surface of a smooth round heat transfer pipe at intervals, concave pyramid-shaped rough elements and convex pyramid-shaped rough elements are uniformly arranged along the circumferential direction and the axial direction of the heat transfer pipe, the number of the pyramid-shaped rough elements arranged along the radial direction and the axial direction of the heat transfer pipe is not less than 3, the surfaces of the convex pyramid-shaped rough elements are converged to form the vertexes of the pyramid-shaped rough elements, and the pyramid-shaped rough elements are tightly connected.
The radial section A-A of the pyramid-shaped enhanced heat transfer pipe is a petal-shaped section, and the axial section B-B of the pyramid-shaped enhanced heat transfer pipe (1) is a wavy pipe wall with alternate concave and convex parts. The pyramid-shaped rough element can be in a diamond shape or a parallelogram shape and is confirmed according to the length ratio L/D, the elevation angle theta and the height ratio H/D of the pyramid-shaped rough element. Wherein, H is the height of the pyramid-shaped rough element, L is the length of the pyramid-shaped rough element, and D is the diameter of the round tube before the pyramid-shaped rough element is machined on the surface of the reinforced combined heat transfer tube.
In the hollow vortex generator, after a part of material is cut off on the basis of the aluminum flat sheet, two connecting bands are reserved on the edge of the vortex generator close to the inner wall of the heat transfer pipe, two circular support rings are respectively arranged at two ends of each connecting band of the vortex generator and are twisted, and the length of each connecting band is as long as that of the pyramid-shaped reinforced heat transfer pipe.
The pyramid-shaped combined enhanced heat transfer pipe with the built-in hollow vortex generators is formed by placing the hollow twisted vortex generators into the pyramid-shaped enhanced heat transfer pipe. The length of the hollow vortex generator is equal to or slightly shorter than the length of the heat transfer pipe. Gamma and beta are an incident flow shape angle and a back flow shape angle before the hollow vortex generator is not twisted, the shape of the hollow vortex generator before being twisted determines the angle beta, and the gamma ranges from 90 degrees to 155 degrees and from 115 degrees to 25 degrees respectively. Hollow vortex generators with different shapes can be cut according to the difference of the incident flow shape angle beta and the back flow shape angle gamma, such as: the device comprises an isosceles trapezoid hollow vortex generator, a parallelogram hollow vortex generator, a right-angle trapezoid hollow vortex generator and a rectangular hollow vortex generator, wherein the isosceles trapezoid hollow vortex generator is gamma-beta, the parallelogram hollow vortex generator is gamma-180-beta, the right-angle trapezoid hollow vortex generator is gamma-90-beta, and the rectangular hollow vortex generator is gamma-90-beta.
The technical effects of the utility model are mainly embodied in that:
(1) the inner surface and the outer surface of the middle heat transfer pipe are continuous concave-convex alternative pyramid type rough elements, and compared with a single-side heat transfer pipe, the heat transfer pipe can play a role in double-side enhanced heat transfer. The selected range of the length ratio, the elevation angle and the height ratio of the pyramid rough elements is very small, each pyramid rough element is very small and is tightly arranged on the pipe wall, and the heat exchange area can be expanded compared with a smooth circular pipe. The existence of the pyramid-shaped rough elements can increase the disturbance of the fluid in the reinforced pipe, so that the fluid generates a velocity vertical to the main flow direction, and the generated transverse vortex and longitudinal vortex can destroy a flow boundary layer and a thermal boundary layer.
(2) The utility model discloses a cavity vortex generator has cut out partial material on the basis of aluminium system plain film, has further reduced the area of contact of fluid with the interpolation, has reduced fluidic physique resistance and flow resistance. The hollow vortex generator can rotate the fluid, and induce to form stronger secondary flow, so that the heat transfer performance is improved.
(3) The utility model discloses insert cavity vortex generator in pyramid type mechanical tubes, make full use of strengthens heat transfer technique passively, when the laminar flow state, under same pyramid structural parameter, heat transfer pipe heat transfer increase 2.54 times when not putting into cavity vortex generator is strengthened in the pyramid combination of built-in cavity vortex generator, and is 2.9 times than pipe heat transfer increase.
Drawings
Fig. 1 is a schematic three-dimensional structure diagram of a pyramid-shaped combined reinforced heat transfer tube with a built-in hollow vortex generator.
Fig. 2 is a side view of a three-dimensional structure of a pyramid-shaped combined reinforced heat transfer pipe with a built-in hollow vortex generator.
Fig. 3 is an axial sectional view of a three-dimensional structure of a pyramid-shaped assembled enhanced heat transfer tube.
FIG. 4 is a schematic three-dimensional structure diagram of a built-in hollow vortex generator.
FIG. 5 is a schematic diagram of structural parameters of the built-in hollow vortex generator when the hollow vortex generator is not twisted.
FIG. 6 is a schematic diagram showing structural parameters of the built-in hollow vortex generator twisted by 360 °.
FIG. 7 is a schematic view of the structural parameters of a pyramid heat transfer tube.
Fig. 8 is a radial cross-sectional view a-a of fig. 7.
FIG. 9 is a graph showing the results of the calculation of Reynolds number Re and Nu.
FIG. 10 is a graph showing the results of the calculation of Reynolds number Re in the case of the resistance coefficient f.
FIG. 11 is a graph of the relationship between the case-calculated Reynolds number Re and the enhanced heat transfer factor JF.
In the figure, 1, a pyramid-shaped reinforced heat transfer pipe; 2, pyramid type rough elements; 3-sunken pyramid-shaped rough elements; 4-raised pyramid-shaped rough elements; 5-vertex of pyramid coarse element; 6-hollow vortex generator; 7, connecting a belt; 8-support ring.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures. FIG. 1 is a schematic diagram of a three-dimensional structure of a pyramid-type assembled enhanced heat transfer tube with a built-in hollow vortex generator according to the present invention.
With reference to fig. 1 to 8, the invention provides a pyramid-shaped combined reinforced heat transfer pipe with a built-in hollow vortex generator, which comprises pyramid-shaped heat transfer pipes (1) and hollow vortex generators (6), wherein pyramid-shaped rough elements (2) are uniformly arranged at intervals along the axial direction and the circumferential direction of the pipe. Fig. 8, the radial section a-a where the top of the pyramid-shaped rough element (2) is located is a petal-shaped section with 5 pyramid-shaped rough elements (2). In the sectional view in fig. 2, it can be seen that the axial section B-B where the top of the pyramid-shaped rough element (2) is located is a wavy tube wall with alternate concave and convex. The hollow vortex generator (6) is formed by cutting off a part of material on the basis of an aluminum flat sheet, two connecting bands (7) are reserved on the edge of the vortex generator close to the inner wall of the heat transfer pipe, two circular support rings (8) are respectively arranged at two ends of each connecting band (7) of the hollow vortex generator (6) and are twisted, and the length of each circular support ring is as long as that of the pyramid-shaped reinforced heat transfer pipe.
In FIG. 4, the thickness δ of the hollow vortex generator is 1-2 mm, the twist rate or twist ratio of the hollow vortex generator is in the range of 2.0-10.0, denoted by Tr, and is defined as: tr ═ Hr/D c Wherein the axial length pitch of the hollow vortex generator twisted by 180 degrees is Hr, and the width of the hollow vortex generator is D c Branch and branchThickness delta of support ring t 0.7-1.5 mm, delta for width of support ring b It means that the thickness of the connecting band with the hollow vortex generator is consistent, and the outer diameter of the support ring is equal to the width of the hollow vortex generator. The helix angle alpha is the attack angle of the hollow vortex generator, and has the following relation with the torsion rate Tr of the hollow vortex generator: α ═ arctan [ pi/(2 Hr/D) c )]。S t Is the spacing between adjacent vortex generators after twisting, the size of which is determined by the attack angle alpha of the vortex generators and the spacing S between adjacent vortex generators before untwisting s Determining, the specific relation is:
the distance between adjacent vortex generators before the vortex generator turbulence elements are twisted is 1.0-4.0 times of the inner diameter of the heat exchange pipe, and the base band width W of the vortex generator 0 Is 0.3 to 0.6 times of the inner diameter of the heat exchange pipe. Width D of the hollow vortex generator c The diameter of the hollow vortex generator is 1.0-2.0 mm smaller than the inner diameter of the heat exchange tube, and the thickness delta of the hollow vortex generator and the width delta of the support ring b The same is true.
For the purpose of illustrating the objects and advantages of the present invention, the present invention will be further described with reference to the following numerical calculation examples. It should be understood that the specific examples described herein are for purposes of illustration only and are not intended to limit the invention.
The main parameters of the selected calculation domain are as follows: the diameter of a smooth heat transfer pipe before rolling the pyramid-shaped rough element is 19mm, the total pipe length is 480mm, the structural parameters of the pyramid-shaped rough element are respectively that the length ratio L/D is 0.31, the elevation angle theta is 45 degrees and the height ratio H/D is 0.09, the side length of each pyramid-shaped rough element is 15mm, and the height of the pyramid-shaped rough element is 1.9 mm. Selecting a hollow isosceles trapezoid with a twist rate of 3 and a width D of a hollow vortex generator c Is 15mm, and the width W of the base band of the hollow vortex generator 0 Is the width D of the hollow vortex generator c 0.3 times of the total weight of the powder.
The flow and heat transfer of the fluid in the pyramid-shaped combined enhanced heat transfer pipe of the hollow vortex generator are numerically simulated within the Reynolds number Re of 50-500, and compared with the calculation results of the pyramid-shaped enhanced heat transfer pipe and the round pipe, and the comparison results are shown in FIGS. 7, 8 and 9.
FIG. 7 shows the relationship between the Reynolds number Re and the average Knoop number Nu in the pipeline of this embodiment, FIG. 8 shows the relationship between the Reynolds number Re and the resistance coefficient f, FIG. 9 shows the relationship between the Reynolds number Re and the enhanced heat transfer factor JF, and the definition of the enhanced heat transfer factor JF is JF (Nu/Nu) ref )/(f/f ref ) 1/3 Wherein Nu ref And f ref The nussel number and the drag coefficient of the round tube are respectively. It is obvious from the figure that, in the range of the studied number of Re, the heat exchange of the pyramid-shaped combined enhanced heat transfer pipe with the built-in hollow vortex generator is increased by 2.54 times compared with the heat exchange of a circular pipe when no turbulent flow element is inserted, and the enhanced heat transfer factor is greater than 1, which shows that the comprehensive enhanced heat transfer effect is better.
Claims (4)
1. A pyramid-type combined enhanced heat transfer tube with a built-in hollow vortex generator comprises: pyramid intensification heat-transfer pipe (1) and hollow vortex generator (6), its characterized in that: a hollow vortex generator (6) is arranged in the pyramid-shaped reinforced heat transfer pipe (1) of the rolling pyramid-shaped rough element (2), and the pyramid-shaped reinforced heat transfer pipe and the hollow vortex generator are combined into a combined reinforced heat transfer pipe.
2. The pyramid-type combined enhanced heat transfer tube with the built-in hollow vortex generator as claimed in claim 1, wherein: the pyramid-shaped reinforced heat transfer pipe (1) is characterized in that concave-convex pyramid-shaped rough elements (2) are rolled on the surface of a smooth round heat transfer pipe in a rolling mode, concave pyramid-shaped rough elements (3) and convex pyramid-shaped rough elements (4) are evenly arranged along the circumferential direction and the axial direction of the heat transfer pipe, the surfaces of the concave pyramid-shaped rough elements (3) are converged to form vertexes (5) of the pyramid-shaped rough elements, and the pyramid-shaped rough elements (2) are tightly connected.
3. The pyramid-type combined enhanced heat transfer tube with the built-in hollow vortex generator as claimed in claim 1, wherein: the radial section of the pyramid-shaped reinforced heat transfer pipe (1) is a petal-shaped section, and the axial section of the pyramid-shaped reinforced heat transfer pipe (1) is a wavy pipe wall with alternate concave and convex parts.
4. The pyramid-shaped combined enhanced heat transfer tube with a built-in hollow vortex generator as claimed in claim 1, wherein: the hollow vortex generator (6) is formed by cutting off a part of material on the basis of an aluminum flat sheet, two connecting bands (7) are reserved at the edge of the vortex generator close to the inner wall of the heat transfer pipe, two ends of each connecting band (7) of the vortex generator are respectively provided with a circular support ring (8) and are twisted, and the length of each circular support ring is equal to that of the pyramid-shaped reinforced heat transfer pipe (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123001390.9U CN217058486U (en) | 2021-12-02 | 2021-12-02 | Pyramid-type combined reinforced heat transfer pipe with built-in hollow vortex generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123001390.9U CN217058486U (en) | 2021-12-02 | 2021-12-02 | Pyramid-type combined reinforced heat transfer pipe with built-in hollow vortex generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217058486U true CN217058486U (en) | 2022-07-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123001390.9U Expired - Fee Related CN217058486U (en) | 2021-12-02 | 2021-12-02 | Pyramid-type combined reinforced heat transfer pipe with built-in hollow vortex generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217058486U (en) |
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2021
- 2021-12-02 CN CN202123001390.9U patent/CN217058486U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220726 |