Experimental study on condensation of FC-72 in narrow rectangular channel with ellipse-shape pin fins in microgravity

Leigang ZHANG; Bo XU; Juan SHI; Zhenqian CHEN

doi:10.11949/j.issn.0438-1157.20190025

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Experimental study on condensation of FC-72 in narrow rectangular channel with ellipse-shape pin fins in microgravity

更新时间：2020-06-24

- Experimental study on condensation of FC-72 in narrow rectangular channel with ellipse-shape pin fins in microgravity
- CIESC Journal Issue S1, Pages: 45-53(2019)
- 作者机构：
  
  1.东南大学能源与环境学院，江苏南京 210096
  2.东南大学能源热转换及其过程测控教育部重点实验室，江苏南京 210096
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20190025
  CLC： TK 124
- Received：09 January 2019，
  
  Revised：2019-02-22，
- 稿件说明：
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张雷刚, 许波, 施娟, 陈振乾. 微重力条件下FC-72在针肋表面冷凝传热的实验研究[J]. 化工学报, 2019, 70(S1): 45-53

ZHANG Leigang, XU Bo, SHI Juan, CHEN Zhenqian. Experimental study on condensation of FC-72 in narrow rectangular channel with ellipse-shape pin fins in microgravity[J]. CIESC Journal, 2019, 70(S1): 45-53
张雷刚, 许波, 施娟, 陈振乾. 微重力条件下FC-72在针肋表面冷凝传热的实验研究[J]. 化工学报, 2019, 70(S1): 45-53 DOI： 10.11949/j.issn.0438-1157.20190025.

ZHANG Leigang, XU Bo, SHI Juan, CHEN Zhenqian. Experimental study on condensation of FC-72 in narrow rectangular channel with ellipse-shape pin fins in microgravity[J]. CIESC Journal, 2019, 70(S1): 45-53 DOI： 10.11949/j.issn.0438-1157.20190025.

摘要

对微重力条件下矩形窄通道内FC-72蒸气在4种不同参数的椭圆形针肋表面和平板表面上的冷凝传热进行了可视化实验研究，分析了微重力对冷凝表面冷凝液分布、气-液界面、入口蒸气温度、冷凝基底温度、热通量以及冷凝传热系数的影响。结果表明，微重力条件下，矩形窄通道内气-液界面出现不稳定，并有波动和沿侧壁爬升现象。落舱释放前后，冷凝表面液膜形态并未观察到明显变化；对于非稳态状态，冷凝基底温度出现小幅升高，并有一定的滞后，落舱释放后蒸气发生器盘管内流型的转变提高了加热效率，从而导致入口蒸气温度急剧升高；对于脉动状态，基底温度变化情况与非稳态状态相似，但入口蒸气温度并无明显变化；而对于准稳态状态，基底个别测温点温度发生阶跃，入口蒸气温度并无明显变化，热通量和冷凝传热系数发生急剧下降，降幅分别达18%和20%。

Abstract

The condensation heat transfer of FC-72 in a narrow rectangular channel with four kinds of elliptical pin-fin surfaces and a flat surface under microgravity condition was studied by visualization experiments. The effects of microgravity on condensate distribution

steam-liquid interface

condensation substrate temperature

inlet steam temperature and heat flux were analyzed. The results showed that the steam-liquid interface in the narrow rectangular channel was unstable

fluctuated and climbed along the lateral wall in microgravity. No obvious changes were observed in liquid film on the condensing surface after the release of drop cabin. For unsteady state

the condensation substrate temperature increased slightly

and there was a certain delay. After the release of drop cabin

the change of flow pattern in steam generator coil improved the heating efficiency

which resulted in a sharp rise in inlet steam temperature. For pulsating state

the change of substrate temperature was similar to that of unsteady state

but there was no obvious change in inlet steam temperature. For quasi-steady state

the temperature at some temperature measuring points jumped a little bit

but the inlet steam temperature had no obvious change. Furthermore

the heat flux decreased sharply in microgravity

falling by 18.8%.

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references

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