To explore the vapor-liquid flow characteristics and heat transfer mechanism of propane, the flow boiling heat transfer process in a horizontal smooth copper tube with an inner diameter of 6 mm and an effective length of 900 mm is numerically simulated by the volume of flow (VOF) multiphase model using the FLUENT. The profiles of flow pattern, temperature, and velocity are obtained, while the effects of mass flux, heat flux, and saturation temperature on the heat transfer coefficient are investigated. The results show that there are single-phase flow, bubbly flow, plug flow, and wavy flow during the boiling heat transfer process. Velocity and temperature of propane increase along the axial direction of the tube. Under the given conditions, the heat transfer coefficient increases 26.8% and 21.6% averagely with increase of mass flux and heat flux, respectively. Moreover, the heat transfer coefficient increases by an average of 22.1% as the saturation temperature increases from 280 to 286 K. Comparing the heat transfer coefficients of simulation with those of the experiment, it can be concluded that the numerical model has great accuracy with a numerical deviation of ± 20%.

中文翻译：

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水平铜管内丙烷流沸腾换热的数值研究

为了探索丙烷的汽液流动特性和传热机理，利用VOF多相模型对内径为6mm，有效长度为900mm的水平光滑铜管内的沸腾传热过程进行了数值模拟。流利。得到了流型，温度和速度的分布图，同时研究了质量通量，热通量和饱和温度对传热系数的影响。结果表明，沸腾传热过程中存在单相流，气泡流，塞流和波浪流。丙烷的速度和温度沿管子的轴向增加。此外，传热系数随着质量通量，热通量或饱和温度的增加而增加。最后，