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A NUMERICAL STUDY ON THE HEAT TRANSFER CHARACTERISTICS OF A GROOVED VAPOR CHAMBER FOR THERMAL SPREADERS

DOI: 10.1615/ICHMT.2008.CHT.280
11 pages

Zhongliang Liu
Key Laboratory of EHTEC, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Education Commission, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China

Ming Zhang
Key Laboratory of EHTEC, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Education Commission, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China

Guoyuan Ma
Key Laboratory of EHTEC, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Education Commission, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China

Shuiyuan Cheng
Key Laboratory of EHTEC, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Education Commission, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China

Abstrakt

An effective thermal spreader can achieve more uniform heat flux distribution and thus enhance heat dissipation of heat sinks. Vapor chamber is one of highly effective thermal spreaders. In this paper, a novel grooved vapor chamber was designed. The grooved structure of the vapor chamber can improve its axial and radial heat transfer and also can form the capillary loop between condensation and evaporation surfaces. A two dimensional heat and mass transfer model for the grooved vapor chamber is developed. The temperature and velocity field in vapor chamber are obtained. The results show that the thickness of the liquid film in groove is mainly influenced by heat flux and working fluid fill ratio and its distribution in the groove is not uniform. Reducing the liquid film thickness in the heat input region can improve the performance of the vapor chamber. However, if the starting point of liquid film is not from the very center of the region and out of the heat source region, i.e., the dryout appears, the heat transfer performance of the vapor chamber will degenerate significantly. Numerical results reveal that the vapor phase inside the vapor chamber flows dispersedly and this may be one of the main reasons why vapor chambers show a very uniform temperature distribution on the condensation surface. The numerical results also show that there is an optimal working fluid fill ratio.

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