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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study on condensation heat transfer of FC-72 in a narrow rectangular channel with ellipse-shape pin fins: Ground and microgravity experiments
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Experimental study on condensation heat transfer of FC-72 in a narrow rectangular channel with ellipse-shape pin fins: Ground and microgravity experiments

机译：椭圆形销翅片窄矩形通道中FC-72冷凝传热的实验研究：地和微匍匐实验

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摘要

A new type of three-dimensional pin-fin plate with elliptical cross-section was proposed. Condensation heat transfer of FC-72 in a narrow rectangular channel with the proposed pin fins was experimentally studied in normal gravity and microgravity. The effects of pin geometry, thermal conductivity, mass flow rate and gravity on condensation heat transfer were investigated. The visualization experiment under microgravity was carried out and the condensate behaviour was observed by high CCD camera. The results showed that all the elliptical pin-fin plates exhibited substantially better performance than the flat plate. The influence of pin geometry and thermal conductivity on condensation heat transfer coefficient was great. The smaller pin size and higher thermal conductivity were favourable for condensation enhancement. The average condensation heat transfer coefficient increased with the increase of mass flow rate. In microgravity, obvious fluctuations and climbs occurred in gas-liquid interface. However, the condensate behaviour on the condensing surface was unconspicuous. For unsteady state, the vapor-side temperature difference increased evidently in microgravity. Microgravity had a certain effect on temperature evolution of the condensing base. Short-term microgravity degraded the condensation heat transfer coefficient in quasi-steady state or unsteady state, but had little effect on pulsating state. (C) 2019 Elsevier Ltd. All rights reserved.
机译：提出了一种具有椭圆形横截面的新型三维钉翅片板。在正常重力和微重力的实验研究了具有所提出的销翅片的窄矩形通道中Fc-72的冷凝传热。研究了销几何形状，导热性，质量流量和重力对冷凝热传递的影响。进行微匍匐度下的可视化实验，并通过高CCD相机观察到冷凝物行为。结果表明，所有椭圆形钉翅片板的表现出比平板的性能大得多。销几何和导热性对冷凝传热系数的影响很大。较小的销尺寸和较高的导热性有利于冷凝增强。随着质量流量的增加，平均凝结传热系数增加。在微重力，气液界面中发生明显波动和攀升。然而，冷凝表面上的冷凝物行为是不合作的。对于不稳定的状态，微沉降中的气相温度差显然增加。微匍匐对冷凝碱的温度演变具有一定的影响。短期微疱疹降低了准稳态或不稳定状态的冷凝传热系数，但对脉动状态影响不大。 （c）2019 Elsevier Ltd.保留所有权利。

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