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An experimental investigation of heat transfer performance of a flat plate heat pipe with a combined capillary structure

  • Yiwei Wang
  • Jiwen Cen
  • Fangming Jiang
Original

Abstract

In this work it is conducted an experimental study to evaluate the thermal performance of a new design flat plate heat pipe (FPHP), which can be applied to cooling of electronic equipment or devices. The FPHP uses a 500 PPI (pores per inch) screen mesh as the capillary wick and some micro-channels are located on the condensation surface and the surfaces of internal fins. The experiments, under different heating loads, indicate superior performance of the FPHP in terms of start-up time and temperature uniformity on the condensation surface. In addition, the effects of working fluid, charging ratio, angle of incline, screen mesh material, and the number of screen mesh layers and of internal support plates on the thermal performance of the FPHP are studied. The results indicate that using distilled water as the FPHP working fluid gives better thermal performance than using acetone or ethanol. The optimum charging ratio is found to be 25%; the screen mesh material and the geometric structures of the wick and the micro-fins show important effects on the thermal performance of the FPHP. Different placement of the FPHP also leads to change at its thermal performance. A minimum thermal resistance of 0.231 °C/W is measured when the angle of incline is 0° (horizontal placement) and the heating load is 40 W.

Nomenclature

A

Area, m2

h

Thermal conductivity, W/m/K or latent heat, J/kg

K

Permeability, m2

M

The parameter relate to the wick and the FPHP structure

N

Quality factor, W/m2

P

Pressure, Pa

Q

Heat power, W

q

Heat load flux, W/m2

R

Thermal resistance, °C/W

r

Effective pore diameter, m

T

Temperature, °C

v

Velocity, m/s

Greek symbols

σ

Surface tension, N/m

θ

Contact angle

ε

Porosity

μ

Dynamic viscosity, Pa·s

x

Length, m

ρ

Density, kg/m3

Δ

The difference

Subscripts

c

Channel or condensation

cap

Capillary

eff

Effective

g

Gravity

l

Liquid

m

Mesh

v

Evaporator surface or vapor

Abbreviations

FPHP

Flat plate heat pipe

LED

Light emitting diode

PPI

Pores per inch

Notes

Acknowledgements

Financial support received from the Guangdong Science and Technology Department (2017B010120003, 2015A030308019, 2016A030313172), the Guangzhou Scientific and Technological Development Plan (201804020020), the China National Key R&D Project (2018YFB0905303), and the Guangdong Key Laboratory of New and Renewable Energy Research and Development (Y709jf1001) is gratefully acknowledged.

Compliance with ethical standards

Conflicts of interest

The authors declare no conflicts of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Laboratory of Advanced Energy Systems, CAS Key Laboratory of Renewable Energy, Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou Institute of Energy ConversionChinese Academy of Sciences (CAS)GuangzhouChina
  2. 2.University of Chinese Academy of SciencesBeijingChina

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