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Condensation heat transfer enhancement mechanism for vertical upflows by the phase separation concept at small gravity

小重力环境下相分离冷凝管内冷凝强化换热机理研究

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  • Engineering Sciences
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Science Bulletin

Abstract

In the field of aerospace, minimum and seal of equipments cause the increase in the thermal loading sharply. Due to the lack of driving force, the performance of conventional condenser deteriorates greatly under the small gravity environment, which leads to reduction in the service life of equipments. In this study, a passive condenser, developed on basis of the phase separation concept, is utilized to improve the performance of the condensation heat transfer under the small gravity environment. As a result of the limitation of experiments, the mechanisms of heat transfer enhancement of the phase separation condenser tube are revealed through numerical simulation based on the volume-of-fluid (VOF) method. The following conclusions could be obtained: (1) A novel phase distribution of “gas near the tube wall and liquid in the tube core” is formed. The thin liquid film is indeed created after the flow pattern modulation by inserting mesh cylinder. (2) The condensation quantity for single bubble in the annular region increases about 16 times greater than that in the bare tube region in the case of J l = 0.0574 m/s and J g = 0.0229 m/s. (3) Gas volume fraction affects the parameters of liquid film thickness, bubble length and liquid bridge length. The increase in the gas volume fraction results in the decrease in the evaluation index from 21.56 to 12.82. The evaluation index is defined as the ratio of the condensation quantities per unit tube length of the annular region and the bare tube region.

摘要

对于航空航天领域,由于设备体积最小化及封装的需求,导致设备热负荷极具增加。此外,小重力环境下由于缺少足够的驱动力,液体在管壁面大量聚集,液膜厚度增加,导致冷凝换热性能恶化,这将降低设备的使用寿命。为了克服这一问题,一种相分离冷凝管被提出用于提高小重力环境下的冷凝换热性能。由于小重力环境下实验研究的限制,本文采用VOF方法数值研究了相分离冷凝管内的冷凝强化换热机理。研究表明:(1)由于金属网状结构的存在,形成了“气在管壁,液在中心”的新型流型结构,产生的超薄液膜有利于强化冷凝换热;(2)在J 1 = 0.0574 m/s 和 J g  = 0.0229 m/s的工况下,环隙区域内单个气泡的冷凝量较光管区域提高了约16倍;(3)气体体积流量对液膜厚度、气弹长度和液桥长度均具有较大影响。随着气体体积流量的增加,冷凝强化评价指标从21.56下降到了12.82。这里冷凝强化评价指标定义为环隙区域和光管区域内单位管长冷凝量的比值。

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51476054 and 51506026) and the Program for New Century Excellent Talents in University (NCET-13-0792).

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Authors and Affiliations

  1. School of Energy and Power Engineering, Northeast Dianli University, Jilin, 132012, China

    Qicheng Chen

  2. School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing, 102617, China

    Dongliang Sun

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Correspondence to Dongliang Sun.

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Chen, Q., Sun, D. Condensation heat transfer enhancement mechanism for vertical upflows by the phase separation concept at small gravity. Sci. Bull. 60, 1759–1767 (2015). https://doi.org/10.1007/s11434-015-0906-9

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  • DOI: https://doi.org/10.1007/s11434-015-0906-9

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