Experimental Study on the Evaporation and Condensation Heat Transfer Characteristics of a Vapor Chamber

Yanfei Liu, Xiaotian Han, Chaoqun Shen, Feng Yao and Mengchen Zhang
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Yanfei Liu: School of Engineering Technology, Purdue University, West Lafayette, IN 47906, USA
Xiaotian Han: School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China
Chaoqun Shen: School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China
Feng Yao: Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
Mengchen Zhang: Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

Energies, 2018, vol. 12, issue 1, 1-13

Abstract: A vapor chamber can meet the cooling requirements of high heat flux electronic equipment. In this paper, based on a proposed vapor chamber with a side window, a vapor chamber experimental system was designed to visually study its evaporation and condensation heat transfer performance. Using infrared thermal imaging technology, the temperature distribution and the vapor–liquid two-phase interface evolution inside the cavity were experimentally observed. Furthermore, the evaporation and condensation heat transfer coefficients were obtained according to the measured temperature of the liquid near the evaporator surface and the vapor near the condenser surface. The effects of heat load and filling rate on the thermal resistance and the evaporation and condensation heat transfer coefficients are analyzed and discussed. The results indicate that the liquid filling rate that maximized the evaporation heat transfer coefficient was different from the liquid filling rate that maximized the condensation heat transfer coefficient. The vapor chamber showed good heat transfer performance with a liquid filling rate of 33%. According to the infrared thermal images, it was observed that the evaporation/boiling heat transfer could be strengthened by the interference of easily broken bubbles and boiling liquid. When the heat input increased, the uniformity of temperature distribution was improved due to the intensified heat transfer on the evaporator surface.

Keywords: vapor chamber; evaporation; condensation; phase change; visualization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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