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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flow boiling heat transfer and pressure drop of R32 inside 2.1 mm, 2.6 mm and 3.1 mm microfin tubes
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Flow boiling heat transfer and pressure drop of R32 inside 2.1 mm, 2.6 mm and 3.1 mm microfin tubes

机译：R32在2.1 mm，2.6 mm和3.1 mm微翅片管内的流动沸腾传热和压降

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摘要

The flow boiling heat transfer and frictional pressure drop of R32 were experimentally investigated inside three horizontal small-diameter microfin tubes of equivalent diameters of 2.1 mm, 2.6 mm, and 3.1 mm. These microfin tubes of the same fin height, helix angle, and number of fins, but different tube diameters were used to resolve the effect of tube diameter. Furthermore, the effects of the mass velocity, heat flux, vapor quality, and channel size on the flow boiling characteristics were investigated. It was found that under high-mass velocities and high-heat flux conditions, the well-known heat transfer characteristics, forced convection and nucleate boiling, were dominant. On the contrary, under intermediate mass velocities and low-heat fluxes, the heat transfer through a thin liquid film formed in spirally grooves was dominant. The heat transfer coefficients increased and the dryout inception quality decreased with a decrease in channel size, under almost all conditions. Moreover, the frictional pressure drop increased with an increase in mass velocity and vapor quality and a decrease in channel size. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在等效直径为2.1mm，2.6mm和3.1mm的三个水平小直径微翅片管内，对R32的沸腾传热和摩擦压降进行了实验研究。这些具有相同翅片高度，螺旋角和翅片数量但管直径不同的微翅片管用于解决管直径的影响。此外，研究了质量速度，热通量，蒸气质量和通道尺寸对流动沸腾特性的影响。结果发现，在高速度和高热通量条件下，众所周知的传热特性，强制对流和核沸腾是主要的。相反，在中等质量速度和低热通量下，通过形成在螺旋形凹槽中的液体薄膜的传热占主导地位。在几乎所有条件下，随着通道尺寸的减小，传热系数增加，干缩起始质量降低。而且，摩擦压降随着质量速度和蒸汽质量的增加以及通道尺寸的减小而增加。 （C）2019 Elsevier Ltd.保留所有权利。

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