Chin. Phys. Lett.  2010, Vol. 27 Issue (7): 076401    DOI: 10.1088/0256-307X/27/7/076401
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
Transition to Film Boiling in Microgravity: Influence of Subcooling

ZHAO Jian-Fu, LI Jing, YAN Na, WANG Shuang-Feng

Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190
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ZHAO Jian-Fu, LI Jing, YAN Na et al  2010 Chin. Phys. Lett. 27 076401
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Abstract

The transition process to film pool boiling in microgravity is studied experimentally aboard the Chinese recoverable satellite SJ-8. A quasi-steady heating method is adopted, in which the heating voltage is controlled to increase exponentially with time. Small, primary bubbles are formed and slid on the surface, which coalesce with each other to form a large coalesced bubble. Two ways are observed for the transition from nucleate to film boiling at different subcoolings. At high subcooling, the coalesced bubble with a smooth surface grows slowly. It is then difficult for the coalesced bubble to cover the whole heater surface, resulting in a special region of transition boiling in which nucleate boiling and local dry areas can coexist. In contrast, strong oscillation of the coalesced bubble surface at low subcooling may cause rewetting of local dry areas and activation of more nucleate sites, resulting in an abrupt transition to film boiling.

Keywords: 64.70.Fh      44.35.+c     
Received: 14 October 2009      Published: 28 June 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/27/7/076401       OR      https://cpl.iphy.ac.cn/Y2010/V27/I7/076401
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Articles by authors
ZHAO Jian-Fu
LI Jing
YAN Na
WANG Shuang-Feng
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[9] Lee H S, Merte H and Chiaramonte F 1997 J. Thermophy. Heat Transfer 11 216
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