R30在矩形微通道内沸腾换热数值模拟

NUMERICAL SIMULATION ON BOILING HEAT TRANSFER OF R30 IN RECTANGLE MICROCHANNEL

摘要: 利用FLUENT软件，采用VOF两相流模型对制冷剂R30在横截面为0.5 mm×0.5 mm、长为500 mm矩形微通道内的沸腾换热进行了数值模拟。以制冷剂入口温度、压力和质量流率作为变量，得出了典型流型、壁面平均温度、换热系数、截面含气率等参数的变化规律。结果表明，提高制冷剂入口温度和压力有利于增强R30在微通道内的沸腾换热，换热系数随着质量流率的增大而增大，随着截面含气率的增大而减小。

Abstract: Boiling heat transfer of R30 refrigerant in a rectangle microchannel with the diameter of 0.5 mm×0.5 mm and the length of 500 mm is numerically simulated with FLUENT software using VOF two-phrase flow model.The inlet working condition of refrigerant and mass flow rate are chosen as variables.The law of typical flow regimes，average wall temperature，heat transfer coefficient and void fraction are obtained.The simulation result shows that it is useful to enhance the boiling heat transfer of R30 in micro-channel by increasing the inlet temperature and pressure of the refrigerant. Heat transfer coefficient is increased with the increasing of flow rate and decreased with the increasing of void fraction.