| Transition to Film Boiling in Microgravity： Influence of Subcooling |
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| 引用本文： | 赵建福,李晶,闫娜,王双峰.Transition to Film Boiling in Microgravity： Influence of Subcooling[J].中国物理快报,2010,27(7):198-201. |
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| 作者姓名： | 赵建福 李晶 闫娜 王双峰 |
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| 作者单位： | Key Laboratory of Microgravity （National Microgravity Laboratory）, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant No 10972225. |
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| 摘 要： | The transition process to film pool boiling in microgravity is studied experimentally aboard the Chinese recoverable satellite S J-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.
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| 关 键 词： | 池沸腾 微重力 过冷 电影 表面光滑 干旱地区 返回式卫星 过渡过程 |
| 收稿时间： | 2009-10-14 |
Transition to Film Boiling in Microgravity: Influence of Subcooling |
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| ZHAO Jian-Fu,LI Jing,YAN Na,WANG Shuang-Feng.Transition to Film Boiling in Microgravity: Influence of Subcooling[J].Chinese Physics Letters,2010,27(7):198-201. |
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| Authors: | ZHAO Jian-Fu LI Jing YAN Na WANG Shuang-Feng |
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| Affiliation: | Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190 |
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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. |
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| Keywords: | 64 70 Fh 44 35 +c |
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