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首页> 外文期刊>International Journal of Heat and Mass Transfer >Dynamics and heat transfer of a hollow droplet impact on a wetted solid surface
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Dynamics and heat transfer of a hollow droplet impact on a wetted solid surface

机译：空心液滴的动力学和热传递对润湿的固体表面产生影响

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摘要

A numerical model based on the coupled level set and volume of fraction (CLSVOF) method is developed to investigate dynamics of a hollow droplet impacting on a wetted solid surface and the associated heat transfer process. Numerical results show different impact behaviors of the hollow droplet as compared to a continuous dense droplet. One of the distinctive flow features of the hollow droplet is a central counter jet, which is not present in continuous dense droplets. Analysis of pressure distribution indicates that the central counter jet is mainly due to the pressure gradient inside the hollow droplet during the impact and spreading. Simulation results also show that the impact velocity of the hollow droplet determines its spread factor, dimensionless spreading edge-jet height and central counter-jet height, all with positive relations. The complicated transient heat transfer between the impacting droplet and the surface was analyzed. The average heat flux increases with higher impact velocity. Overall heat transfer during hollow droplet impact is found to be lower than that during continuous dense droplet impact. These results provide better understanding of hollow droplet impingement and heat transfer on wetted surfaces.
机译：建立了基于液位和体积分数耦合的数值模型（CLSVOF），以研究空心液滴撞击润湿的固体表面的动力学及其相关的传热过程。数值结果表明，与连续的致密液滴相比，空心液滴的冲击行为不同。空心液滴的独特流动特征之一是中央反向射流，它在连续的密集液滴中不存在。压力分布分析表明，中央反向射流主要是由于撞击和扩散过程中空心液滴内部的压力梯度引起的。仿真结果还表明，空心液滴的撞击速度决定了其扩散因子，无量纲的扩散边缘射流高度和中心反射流高度，都具有正相关关系。分析了冲击液滴与表面之间复杂的瞬态热传递。平均热通量随着较高的冲击速度而增加。发现中空液滴撞击期间的总传热低于连续致密液滴撞击期间的总传热。这些结果可以更好地理解中空液滴在湿润表面上的撞击和传热。

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