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Heat and Mass Transfer

, Volume 55, Issue 11, pp 3065–3075 | Cite as

Influences of copper columns on thermal hydraulic performance of the vapor chamber

  • Li Cong
  • Jian Qifei
Original
  • 74 Downloads

Abstract

A simplified and efficient hydrothermal model was adapted and validated with both the experiment and literature data to further investigate the mechanism and influence of different columns on thermal performance of the vapor chamber (VC). The experiment was conducted by testing a T-shaped VC under different heat loads, and the maximum error with the numerical model was about 2 K. Factors including column dimension, column number and column structures were analyzed. Results show that sintered wick ring layer could provide auxiliary liquid circulation paths, reduce the pressure drop in the fluid circulation, and provide additional heat conductive passages. The column dimension shows enhancement on heat transfer capability of VC as the area ratio in the range of 0~0.5, with a maximum decrease by about 6.45% of the thermal resistance compared with the void VC. By comparing with other column structures, copper columns with sintered wick rings were found to the optimal type for enhancing the thermal performance of VC.

Nomenclature

PK

Permeability (m−2)

r

Radius (m)

\( \overrightarrow{V} \)

Velocity vector (m/s)

p

Pressure (pa)

S

Pressure source term

T

Temperature (K)

Dc

Column diameter (m)

Q

Heat transfer rate (W)

k

Thermal conductivity (W/m K)

A

Area (m2)

∆L

Side length of a control volume (m)

hfg

Latent heat of vaporization (kJ/kg)

q

Heat flux (W/m2)

R

Thermal resistance (K/W)

h

Convective heat transfer coefficient (W/m2 K)

\( \overline{T} \)

Average temperature (K)

Greek

ρ

Density (kg/m3)

μ

Dynamic viscosity (pa s)

θ

Solid-liquid contact angle

ε

Wick porosity

σ

Liquid-vapor surface tension (N/m), 0.072 N/m

Subscript

l

Liquid region

e

Evaporation section

c

Condensation section

i

Control volume index

v

Vapor region

normal, l

Normal direction in liquid interface

normal, v

Normal direction in vapor interface

Ambient

w

Solid wall

wick

Wick structure

sat

Saturation

cop

Copper powder

Notes

Acknowledgments

This research was supported by the National Natural Science Foundation of China (21776095), the Guangzhou Science and Technology Program (No. 201804020048). Guangdong key laboratory of Clean energy technology (2008A060301002), and the Startup Foundation for Docotors of Jiangxi University of Science and Technology (3401223407).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Li Cong
    • 1
  • Jian Qifei
    • 2
    • 3
  1. 1.School of Mechatronics EngineeringJiangxi University of Science and TechnologyGanzhouChina
  2. 2.School of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhouChina
  3. 3.GuangzhouChina

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