论文部分内容阅读
利用Mixture多相流模型对R32在2 mm水平微细光管内流动沸腾进行了三维稳态数值模拟。模拟的工况范围为:质量流速200~400 kg/(m~2s),热流密度10~40 kW/m~2,饱和温度15~20℃。结果表明:质量流速的增加消弱了重力对两相分布的影响;热流密度的增加强化了壁面附近的核态沸腾。数值模拟的换热系数和压降与实验结果的平均偏差分别为11.3%和-1.1%。
Three-dimensional steady-state numerical simulation of R32 flow boiling in a 2 mm horizontal microtube was carried out by using Mixture multiphase flow model. The simulated working conditions ranged from mass flow rate 200 ~ 400 kg / (m ~ 2s), heat flux density 10 ~ 40 kW / m ~ 2 and saturation temperature 15 ~ 20 ℃. The results show that the increase of mass flow rate weakens the influence of gravity on the distribution of the two phases. The increase of heat flux intensifies the nucleate boiling around the wall. The average deviation of the numerical simulation of the heat transfer coefficient and pressure drop from the experimental results were 11.3% and -1.1%, respectively.