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Heat Transfer Research
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ISSN Print: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2012005690
pages 133-144

EXPERIMENTAL STUDY ON NATURAL CONVECTION COOLING OF LED USING A FLAT-PLATE PULSATING HEAT PIPE

Zhi Li
Institute of Thermal Energy Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
Li Jia
Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing 100044, China

ABSTRACT

Heat dissipation structure is important for high-power LED chips because of a high heat flux. The experimental study of cooling high-power LED (up to 100 W) based on the combination of flat-plate pulsating heat pipe (PHP) and natural convection fins was conducted. The effects of heating power, working fluids, filling ratio (rate of liquid-filled volume to the total volume of channels), configuration parameters, and fin area on the start-up time and the thermal characteristics of the plate PHP were investigated experimentally. The experimental results indicated that cooling by a flat-plate PHP with natural convection fins was effective in lowering the temperature of high-power LED. However, the thermal characteristics of a flat-plate PHP with natural convection cooling possessed large disparity compared to that of forced convection cooling. The optimal filling ratio range was 30% to 50% in this research and the thermal performance of a flat-plate PHP with acetone as a working fluid was better than that with ethanol. Moreover, a flat-plate PHP with a trianglular cross-section channel led to a lower thermal resistance than that with a square cross-section channel. The study of thermal resistance based on channel cross-sectional area was suggested.