2021•应用数学和力学Open access
Study on Droplet Impinging on Orifice Plates With Different Wettability Based on Lattice Boltzmann Method
LIANG Jia, 上海理工大学 能源与动力工程学院 上海市动力工程多相流动与传热重点实验室, 上海 200093, GAO Ming, Chen Lǚ, WANG Dongming, WANG Zhiyun, ZHANG Lixin
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Abstract
Based on lattice Boltzmann method, the numerical simulation of droplet impinging on orifice plates with different wettability was carried out. The influence of weber number (We) number, wettability of orifice surface and orifice size on different states of droplet passing through orifice plate during droplet impact was studied. The numerical simulation results show that different phenomena will occur in the process of droplet impacting the orifice plate: when the orifice plate is hydrophilic, the droplet will not detach from the surface of the orifice plate, but adhere to the lower surface of the orifice plate at a lower We number, and the droplet will rise a certain distance in the orifice channel under the action of capillarity, forming liquid plugging phenomenon. At higher We numbers, droplets will pass through the orifice plate and rupture will occur. When the orifice plate is hydrophobic, the droplets can not pass through the orifice plate and can not migrate to the lower surface at a lower We number, and finally stabilize on the orifice channel. At higher We numbers, droplets can pass through the orifice plate, and when they pass through, they will break, leaving droplets remaining on the surface of the orifice plate. When the orifice size was changed, it was found that the droplet was not easy to pass through when the orifice size was smaller or the orifice thickness was thicker.