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首页> 外文期刊>Advances in Mechanical Engineering >Heat Transfer Coefficient during Evaporation of R-1234yf, R-134a, and R-22 in Horizontal Circular Small Tubes
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Heat Transfer Coefficient during Evaporation of R-1234yf, R-134a, and R-22 in Horizontal Circular Small Tubes

机译：水平圆形小管中R-1234yf，R-134a和R-22蒸发过程中的传热系数

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摘要

Experimental data of heat transfer coefficient during evaporation of R-1234yf, R-134a, and R-22 in horizontal circular small tubes are compared. The local heat transfer coefficient is obtained for heat fluxes ranging from 10 to 35 kW m~(-2), mass fluxes ranging from 100 to 650 kg m~(-2) s~(-1), saturation temperatures of 5, 10, and 15℃, and quality up to 1.0. The test sections are made of stainless steel tubes with inner diameters of 1.5 and 3.0 mm, the lengths of 1000 and 2000. Effects of heat flux, inner tube diameter, and saturation temperature on heat transfer coefficient are reported in the present study. Nucleate boiling heat transfer contribution is predominant, especially at low quality region, and laminar flow appears in the evaporative small tubes. The experimental results are compared against four existing heat transfer coefficients, and the modified correlation of heat transfer coefficient is developed with good prediction.
机译：比较了水平圆形小管中R-1234yf，R-134a和R-22蒸发过程中的传热系数的实验数据。对于10至35 kW m〜（-2）的热通量，100至650 kg m〜（-2）s〜（-1）的质量通量，5、10的饱和温度获得局部传热系数，温度15℃，质量达到1.0。测试部分由内径为1.5和3.0 mm，长度为1000和2000的不锈钢管制成。本研究报道了热通量，内管直径和饱和温度对传热系数的影响。核沸腾的传热贡献是主要的，尤其是在低质量区域，并且在蒸发的小管中出现层流。将实验结果与现有的四个传热系数进行比较，并建立了改进的传热系数相关性，并具有良好的预测性。

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