Experimental Research on the Thermal Performance and Semi-Visualization of Rectangular Flat Micro-Grooved Gravity Heat Pipes

Xiang Gou, Qiyan Zhang, Yamei Li, Yingfan Liu, Shian Liu and Saima Iram
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Xiang Gou: School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
Qiyan Zhang: School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
Yamei Li: School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
Yingfan Liu: School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
Shian Liu: School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
Saima Iram: School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China

Energies, 2018, vol. 11, issue 9, 1-12

Abstract: To strengthen the heat dissipating capacity of a heat pipe used for integrated insulated gate bipolar transistors, as an extension of our earlier work, the effect of micro-groove dimension on the thermal performance of flat micro-grooved gravity heat pipe was studied. Nine pipes with different depths (0.4 mm, 0.8 mm, 1.2 mm) and widths (0.4 mm, 0.8 mm, 1.2 mm) were fabricated and tested under a heating load range from 80 W to 180 W. The start-up time, temperature difference, relative thermal resistance and equivalent thermal conductivity were presented as performance indicators by comparison of flat gravity heat pipes with and without micro-grooves. Results reveal that the highest equivalent thermal conductivity of the flat micro-grooved gravity heat pipes is 2.55 times as that of the flat gravity heat pipe without micro-grooves. The flat gravity heat pipes with deeper and narrower micro-grooves show better thermal performance and the optimal rectangular micro-groove dimension among the selected options is determined to be 1.2 mm (depth) × 0.4 mm (width). Furthermore, the liquid–vapor phase behaviors were observed to verify the heat transfer effects and analyze the heat transfer mechanism of the flat micro-grooved heat pipes.

Keywords: flat micro-grooved gravity heat pipe; rectangular micro-groove; thermal performance; semi-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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