Lattice Boltzmann simulation of liquid falling on horizontal rectangular pillar arrays
Lattice Boltzmann simulation of liquid falling on horizontal rectangular pillar arrays
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DOI：
10.1051/e3sconf/202132101014
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发表时间：
2021
影响因子：
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通讯作者：
M. Sugimoto;Tatsuya Miyazaki;Zelin Li;M. Kaneda;K. Suga
中科院分区：
文献类型：
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作者：
M. Sugimoto;Tatsuya Miyazaki;Zelin Li;M. Kaneda;K. Suga
汽车的定子线圈在运行中产生热量，并由从上方注入的冷却剂冷却。由于冷却剂在盘管上的行为特性由于其复杂性而尚不清楚，因此进行了三维两相流模拟。在这项研究中，作为一个垫脚石的液体落在实际线圈的模拟，线圈建模与水平的矩形柱阵列，其管理参数可以很容易地改变。采用格子Boltzmann方法和相场模型对两相流进行了数值模拟，研究了冷却液的物性、润湿性和柱间差距等控制参数对润湿面积的影响。结果表明，由于原油粘度高，易于在柱状体上扩散。此外，当接触角小时，液体迅速扩散。在柱堆叠的情况下，内部柱的润湿面积大于暴露的柱的润湿面积。
Stator coils of automobiles in operation generate heat and are cooled by a coolant poured from above. Since the behavior characteristic of the coolant poured on the coils is not clarified yet due to its complexity, the three-dimensional two-phase flow simulation is conducted. In this study, as a steppingstone to the simulation of the liquid falling on the actual coils, the coils are modelled with horizontal rectangular pillar arrays whose governing parameters can be easily changed. The two-phase flows are simulated using the lattice Boltzmann method and the phase-field model, and the effects of the governing parameters, such as the physical properties of the cooling liquid, the wettability, and the gap between the pillars, on the wetting area are investigated. The results show that the oil tends to spread across the pillars because of its high viscosity. Moreover, the liquid spreads quickly when the contact angle is small. In the case that the pillars are stacked, the wetting area of the inner pillars is larger than that of the exposed pillars.