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Experimental Research on Thermal Performance of Ultra-Thin Flattened Heat Pipes

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Journal of Thermal Science Aims and scope Submit manuscript

Abstract

Ultra-thin flattened heat pipe (UTHP) is an effective solution to solve the problem of high-power density heat dissipation in narrow space. The key factors that determine its thermal performance include: the shapes and sizes of the UTHP, the wick structure, the type of working fluid and its filling ratio. The change in the filling ratio means not only a change in the amount of the working fluid, but also a change in the space distribution of the gas and liquid phases inside the heat pipe. Therefore, it is important to explore the effect of liquid filling ratio on the thermal performance of UTHP. It can provide effective guidance for the production of UTHP. In this work, experiments were conducted on four groups of UTHPs with different mesh wicks under a series of liquid filling ratios. The results demonstrate that the volume of the filling working fluid should account for 22%–37% of the total internal volume of the UTHP to avoid deterioration of heat transfer during the operation of the UTHP. In addition, a prediction model of the evaporator temperature has been established to provide guidance for the application of UTHPs.

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Abbreviations

a :

half width of the interval

d :

wire diameter/mm

f w :

liquid filling ratio/%

h :

height/mm

k :

coverage factor

L :

length of the heat pipe

M :

mesh size/mm−1

N :

mesh number/cm−1

Q :

heat load/W

R :

thermal resistance/K·W−1

r :

radius/mm

t :

thickness/mm

T :

temperature/°C

u :

uncertainty of the measurement

V :

volume/mm3

ε :

porosity/%

λ :

height ratio of the vapor channel/%

ψ :

rate of evaporator temperature rise/K·W−1

a:

adiabatic section

c:

condensing section

e:

evaporating section

f:

liquid fluid

i:

inner

input:

input

max:

maximum

min:

minimum

o:

outer

p:

pore

s:

mesh wire

v:

vapor

w:

wick

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Acknowledgement

We would like to express our gratitude to National Key Research & Development Program of China (Grant No. 2017YFB0406100) and Guangzhou Municipal Science & Technology Program Project (Grant No. 201802010013).

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Authors and Affiliations

  1. Key Lab of Heat Transfer Enhancement and Energy Conservation of Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China

    Yongle Tang & Shuangfeng Wang

  2. Shanghai Institute of Satellite Engineering, Shanghai, 200240, China

    Jianguang Cao

Authors
  1. Yongle Tang
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  2. Jianguang Cao
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Correspondence to Shuangfeng Wang.

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Tang, Y., Cao, J. & Wang, S. Experimental Research on Thermal Performance of Ultra-Thin Flattened Heat Pipes. J. Therm. Sci. 31, 2346–2362 (2022). https://doi.org/10.1007/s11630-022-1710-x

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  • DOI: https://doi.org/10.1007/s11630-022-1710-x

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