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首页> 外文期刊>International Journal of Heat and Fluid Flow >Numerical simulations of droplet train and free surface jet impingement
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Numerical simulations of droplet train and free surface jet impingement

机译：液滴流和自由表面射流撞击的数值模拟

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The cooling behavior of the impingement of a droplet train, and free surface jets over a heated and pre-wetted surface is explored employing an Algebraic Volume-of-Fluid methodology. The code is based on a modified version of the two-phase numerical solver interFoam (OpenFOAM) (Trujillo and Lewis, 2012). Two versions of the free surface jet are studied. The first consists of a fully-developed profile exiting the nozzle, and the second is characterized by a uniform velocity distribution. Results show that both jet configurations have higher cooling performance than the droplet train locally and globally, with the fully-developed case being the most effective of the two jet arrangements. Locally, the performance is measured by radial profiles of the boundary-layer-displacement thickness and heat transfer coefficient. Globally, the cooling effectiveness is directly proportional to the surface area that resides within the high-convection region, i.e. before the boundary layer separation point. On a temporal basis, the liquid film within the impingement region of the droplet train exhibits pronounced variations in velocity magnitude and film thickness. This is directly attributed to the nature of continuous droplet impacts affecting the impingement region, and gives rise to an unsteady cooling and heating of the fluid near the wall. In contrast for the jets, the film and the corresponding free surface are nearly steady with only minor perturbations.
机译：使用代数流体体积方法研究了液滴列撞击以及在加热和预先润湿的表面上的自由表面射流的冷却行为。该代码基于两阶段数值求解器interFoam（OpenFOAM）的修改版（Trujillo和Lewis，2012）。研究了两种形式的自由表面射流。第一个特征是从喷嘴出来的完全展开的轮廓，第二个特征是速度分布均匀。结果表明，这两种喷射方式的冷却性能都比液滴在局部和全局范围内的冷却性能更高，其中充分开发的情况是两种喷射方式中最有效的。在局部，通过边界层位移厚度和传热系数的径向曲线来测量性能。总体而言，冷却效率与位于高对流区内（即边界层分离点之前）的表面积成正比。在时间上，液滴流的撞击区域内的液膜在速度大小和膜厚方面表现出明显的变化。这直接归因于影响冲击区域的连续液滴冲击的性质，并导致壁附近流体的不稳定冷却和加热。相比之下，对于射流，薄膜和相应的自由表面几乎稳定，只有很小的扰动。

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