Experimental Study on Thermal Performance of a Loop Heat Pipe with Different Working Wick Materials

Kyaw Zin Htoo, Phuoc Hien Huynh, Keishi Kariya and Akio Miyara
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Kyaw Zin Htoo: Graduate School of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
Phuoc Hien Huynh: Department of Heat and Refrigeration Engineering, Ho Chi Minh City University of Technology—VNU—HCM (HCMUT), 268 Ly Thuong Kiet, Ho Chi Minh City 72409, Vietnam
Keishi Kariya: Department of Mechanical Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
Akio Miyara: Department of Mechanical Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan

Energies, 2021, vol. 14, issue 9, 1-23

Abstract: In loop heat pipes (LHPs), wick materials and their structures are important in achieving continuous heat transfer with a favorable distribution of the working fluid. This article introduces the characteristics of loop heat pipes with different wicks: (i) sintered stainless steel and (ii) ceramic. The evaporator has a flat-rectangular assembly under gravity-assisted conditions. Water was used as a working fluid, and the performance of the LHP was analyzed in terms of temperatures at different locations of the LHP and thermal resistance. As to the results, a stable operation can be maintained in the range of 50 to 520 W for the LHP with the stainless-steel wick, matching the desired limited temperature for electronics of 85 °C at the heater surface at 350 W (129.6 kW·m −2 ). Results using the ceramic wick showed that a heater surface temperature of below 85 °C could be obtained when operating at 54 W (20 kW·m −2 ).

Keywords: electronics cooling; loop heat pipe; wick materials; thermal conductivity (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: 2021
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