喷淋冷却器内液滴撞击液膜的传热数值模拟

Numerical Simulation of Heat Transfer During Droplet Impacting onto Liquid Film of Spray Cooling System

液滴撞击液膜是喷淋冷却过程中的常见现象,利用欧拉多相流模型与连续表面力模型模拟了液滴撞击液膜的传热过程,其中液滴撞击液膜的飞溅规律与实验结果一致.分析了液滴撞击液膜飞溅半径与飞溅高度的变化规律,并进一步分析了撞击速度、液滴直径、液膜深度、壁面温度对液滴-液膜撞击传热量的影响,结果表明增加撞击速度、液滴直径、液膜深度有助于提高喷淋冷却的效果.

The droplet impacting onto liquid film is common phenomenon in the spray cooling system.The Eularian multi-phase model and the continuum surface force（CSF）model are used to simulate the heat transfer process of the droplet impinging onto the liquid film.The simulation results agree well with experimental observations.The variations of crown radius and height under different conditions are analyzed.Again,the effects of impacting velocity,droplet diameter,film depth,wall temperature on the total heat removal are investigated.The results show that the increases in impacting velocity,droplet diameter,film depth enhance the efficiency of spray cooling.