Chin. Phys. Lett.  2011, Vol. 28 Issue (1): 016401    DOI: 10.1088/0256-307X/28/1/016401
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
Bubble Behavior and Heat Transfer of Nucleate Pool Boiling on Micro-Pin-Finned Surface in Microgravity
WEI Jin-Jia1**, XUE Yan-Fang1, ZHAO Jian-Fu2, LI Jing2
1State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049
2Key Laboratory of Microgravity (National Microgravity Laboratory)/CAS, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190
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WEI Jin-Jia, XUE Yan-Fang, ZHAO Jian-Fu et al  2011 Chin. Phys. Lett. 28 016401
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Abstract Nucleate pool boiling on micro-pin-finned surface structure is proposed for efficiently cooling electronic components with high heat flux in microgravity, and was verified by experiments performed utilizing the drop tower Beijing. Micro-pin-fins with the dimensions of 50×60μm2 (thickness × height) and the space of 50 μm were fabricated on the chip surface by the dry etching technique. FC-72 was used as the working fluid. Nucleate pool boiling of FC-72 on a smooth surface was also tested for comparison. Unlike much obvious deterioration of heat transfer of nucleate pool boiling on the smooth surface in microgravity, constant heater surface temperature of nucleate pool boiling for the micro-pin-finned surface was observed, even though a large coalesced bubble completely covered the surface under microgravity condition. The performance of high efficient heat transfer on micro-pin-finned surface is independent of the gravity, which stems from the sufficient supply of fresh liquid to the heater surface due to the capillary forces.
Keywords: 64.70.Fh      44.35.+c     
Received: 08 July 2010      Published: 23 December 2010
PACS:  64.70.fh (Boiling and bubble dynamics)  
  44.35.+c (Heat flow in multiphase systems)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/28/1/016401       OR      https://cpl.iphy.ac.cn/Y2011/V28/I1/016401
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WEI Jin-Jia
XUE Yan-Fang
ZHAO Jian-Fu
LI Jing
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