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Computer Modeling of Liquid Droplet Impact on Heat Transfer During Spray Cooling

机译：液滴液滴对喷射冷却过程中热传递的影响

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Spray cooling is a high flux heat removal technique considered for systems dissipating high power within small areas such as advanced lasers. Recently Selvam and Ponnappan (2004 & 2005) identified the importance of modeling heat transfer in a thin liquid film on a hot surface at the micro level and illustrated how this micro level modeling could help to improve the macro level spray cooling. The goal of this research is to advance the theoretical understanding of spray cooling to enable efficient system level hardware designs. Two-phase flow modeling is done using the level set method to identify the interface of vapor and liquid. The modifications made to the incompressible Navier-Stokes equations to consider surface tension and phase change are presented. The equations are solved using the finite difference method. The effect of liquid droplet impact on a 40 μm thick liquid film containing vapor bubble and the consequent heat removal is explained with a sequence of temperature vs. time contours. From that, the importance of fast transient conduction in the liquid film leading to high heat flux in a short time is illustrated. The optimum positioning of the droplet with respect to the vapor bubble for effective heat removal is also systematically investigated. This information is expected to help in proper positioning of the droplet in three-dimensional modeling.
机译：喷雾冷却是一种高磁通热除去技术，考虑用于在诸如先进激光等小区域内耗散高功率的系统。最近，Selvam和Ponnappan（2004＆2005）确定了在微水平的热表面上薄液膜在薄液体膜上建模的重要性，并说明了这种微型模型如何有助于改善宏观水平喷雾冷却。本研究的目标是推进喷雾冷却的理论理解，以实现高效的系统级硬件设计。使用水平集法进行两相流量建模，以识别蒸气和液体的界面。提出了对不可压缩的Navier-Stokes方程来考虑表面张力和相位变化的修改。使用有限差分法解决方程。液滴冲击对含有蒸汽泡的40μm厚的液体膜的影响和随后的热除去用一系列温度与时间轮廓进行了解释。从此，示出了在短时间内导致高热量通量的液体膜中快速瞬态传导的重要性。还系统地研究了液滴相对于有效散热的蒸气气泡的最佳定位。该信息预计将有助于在三维建模中正确定位液滴。

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