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首页> 外文会议>American Society of Mechanical Engineers(ASME) Summer Heat Transfer Conference(HT2005); 20050717-22; San Francisco,CA(UA) >EFFECTS OF INCLINATION ANGLE ON FALLING FILM EVAPORATION USING R-134A
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EFFECTS OF INCLINATION ANGLE ON FALLING FILM EVAPORATION USING R-134A

机译：倾斜角度对使用R-134A进行胶片蒸发的影响

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摘要

This manuscript discusses the effect of inclination angle and surface geometries on the falling film evaporation performance. Falling film evaporation experiments were conducted on a smooth plate and finned plates using refrigerant R-134a at 18℃ system temperature. The plate was inclined with angles between 10° and 40° , and the heat fluxes are between 36 and 73.5kW/m~2. The local heat transfer coefficients are measured, and the falling film flow distribution is observed through a sight glass. The test results showed that the falling film evaporation heat transfer coefficient increases as the inclination angle increases or the heat flux increases. The finned surface yields better falling film evaporation heat transfer performance than the smooth surface. The ratio of the heat transfer coefficient of the finned surface versus the plain surface is between 2.5 and 12.4 folds. This ratio increases as the inclination angle increases. The visualization observation showed that bubble nucleation is more pronounced on the finned surface than the plain surface. The effect of boiling on falling film evaporation is discussed.
机译：该手稿讨论了倾角和表面几何形状对降膜蒸发性能的影响。在制冷剂R-134a上，在18℃系统温度下，在光滑板和翅片板上进行降膜蒸发实验。板倾斜角度在10°至40°之间，热通量在36至73.5kW / m〜2之间。测量局部传热系数，并通过观察镜观察降膜流量分布。试验结果表明，降膜蒸发传热系数随倾角的增加或热通量的增加而增加。翅片表面比平滑表面产生更好的降膜蒸发传热性能。翅片表面与平面的传热系数之比为2.5至12.4倍。该比率随着倾斜角度的增加而增加。可视化观察表明，在鳍状表面上的气泡成核比平坦表面更明显。讨论了沸腾对降膜蒸发的影响。

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