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首页> 外文期刊>International Journal of Heat and Mass Transfer >Direct simulation of spray cooling: Effect of vapor bubble growth and liquid droplet impact on heat transfer
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Direct simulation of spray cooling: Effect of vapor bubble growth and liquid droplet impact on heat transfer

机译：喷雾冷却的直接模拟：蒸汽气泡的生长和液滴对传热的影响

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Numerical modeling of multiphase flow using level set method is discussed. The 2-D model considers the effect of surface tension between liquid and vapor, gravity, phase change and viscosity. The level set method is used to capture the movement of the free surface. The detail of incorporating the mechanism of phase change in the incompressible Navier-Stokes equations using the level set method is described. The governing equations are solved using the finite difference method. The computer model is used to study the spray cooling phenomenon in the micro environment of about 40 μm thick liquid layer with vapor bubble growing due to nucleation. The importance of studying the heat transfer mechanism in thin liquid film for spray cooling is identified. The flow and heat transfer details are presented for two cases: (1) when the vapor bubble grows due to nucleation and (2) merges with the vapor layer above the liquid layer and when a liquid droplet impacts the thin liquid layer with vapor bubble growing.
机译：讨论了使用水平集方法对多相流进行数值模拟的方法。二维模型考虑了液体和蒸气之间的表面张力，重力，相变和粘度的影响。水平设置方法用于捕获自由表面的运动。描述了使用水平集方法将相变机制纳入不可压缩的Navier-Stokes方程的细节。使用有限差分法求解控制方程。该计算机模型用于研究在约40μm厚的液层的微环境中的喷雾冷却现象，该液层由于成核作用而产生了气泡。确定了研究用于喷雾冷却的液体薄膜中的传热机理的重要性。给出了两种情况的流动和传热细节：（1）当汽泡由于成核而增长，并且（2）与液层上方的汽层合并，并且当液滴随着汽泡的增长而撞击薄的液层时。

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