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Experimental investigation on flow condensation heat transfer and pressure drop of nitrogen in horizontal tubes

机译:水平管中流态凝结换热和氮压降的实验研究

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The characteristics of flow condensation heat transfer and pressure drop of nitrogen are measured in smooth horizontal tubes with an inner diameter of 2 mm and 1 mm. The tests are conducted at saturation temperatures from 101.0 to 106.6 K, with mass fluxes from 13.1 to 78.6 kg/m(2)s for 2 mm tube, and from 65.5 to 262.0 kg/m(2)s for 1 mm tube. The impacts of mass flux, vapor quality, tube diameter and saturation temperature on the heat transfer coefficient and pressure drop are analyzed. Several previous correlations of flow condensation heat transfer coefficient and frictional pressure drop are compared with the experimental data. Since the thermal properties of nitrogen are different from that of non-cryogenic fluids, such as density, viscosity, surface tension and contact angle, the flow condensation heat transfer characteristic of nitrogen is different from that of non-cryogenic fluids. Considering the influence of thermal properties, a revised heat transfer coefficient correlation based on the Shah correlation is proposed for flow condensation of nitrogen in smooth horizontal tubes, with the mean absolute error of 11.2%. (C) 2018 Elsevier Ltd. All rights reserved.
机译:在内径为2 mm和1 mm的光滑水平管中测量流动冷凝热传递和氮压降的特性。该测试在101.0至106.6 K的饱和温度下进行,对于2 mm的管,质量通量为13.1至78.6 kg / m(2)s,对于1 mm的管,质量通量为65.5至262.0 kg / m(2)s。分析了质量通量,蒸汽质量,管径和饱和温度对传热系数和压降的影响。将流动凝结传热系数和摩擦压降的几种先前相关性与实验数据进行了比较。由于氮气的热性质与非低温液体的性质不同,例如密度,粘度,表面张力和接触角,因此氮气的流动冷凝传热特性与非低温液体的性质不同。考虑到热性能的影响,提出了一种基于Shah相关性的修正传热系数相关性,用于光滑水平管中氮的流动冷凝,平均绝对误差为11.2%。 (C)2018 Elsevier Ltd.保留所有权利。

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