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首页> 外文期刊>International Journal of Heat and Mass Transfer >Pressure drop during condensation at low mass fluxes in smooth horizontal and inclined tubes
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Pressure drop during condensation at low mass fluxes in smooth horizontal and inclined tubes

机译：在水平和倾斜光滑管中以低质量通量进行冷凝时的压降

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There are limited studies on pressure drops at low mass fluxes in smooth horizontal and inclined tubes. Thus, this paper presents the pressure drops during the condensation of R134a at low mass fluxes in smooth horizontal and inclined tubes with an internal diameter of 8.38 mm. Experiments were conducted at a saturation temperature of 40 degrees C at mass fluxes of 50, 75 and 100 kg/m(2) s, and mean vapour qualities between 0.1 and 0.9. The temperature differences (between the mean saturation temperature and mean wall temperature) tested were 1, 3, 5, 8, and 10 degrees C. The pressure drops between the test section inlet and outlet over a length of 1.71 m were measured and were found to be temperature difference dependent. The flow patterns were captured concurrently with two high-speed video cameras positioned at the entrance and exit of the test section through sight glasses. The effect of the vapour quality, temperature difference, mass flux, and inclination angle on the measured and frictional pressure drop was analysed and discussed. It was found that the pressure drops increased with an increase in mass flux, temperature difference and vapour quality. Furthermore, the lowest and highest measured pressure drops were obtained during the downward and upward flows respectively. On the other hand, the opposite was found for the frictional pressure drops. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在光滑的水平和倾斜管中，在低质量通量下的压降研究很少。因此，本文提出了在内径为8.38 mm的光滑水平管和倾斜管中，R134a在低质量通量下缩合期间的压降。实验是在40摄氏度的饱和温度下以50、75和100 kg / m（2）s的质量通量进行的，平均蒸汽质量在0.1到0.9之间。测试的温差（平均饱和温度和平均壁温之间）分别为1、3、5、8和10摄氏度。测量并发现测试段入口和出口之间的压力降为1.71 m取决于温度差。通过观察镜同时在位于测试部分入口和出口的两个高速摄像机同时捕获流动模式。分析和讨论了蒸气质量，温差，质量通量和倾斜角度对被测和摩擦压降的影响。发现压降随着质量通量，温度差和蒸气质量的增加而增加。此外，在向下和向上流动期间分别获得了最低和最高的测量压降。另一方面，发现摩擦压降相反。 （C）2018 Elsevier Ltd.保留所有权利。

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