Abstract The entrainment of oil–gas mixture from the wall significantly affects the performances of inertial separators. By spraying the oil–gas mixture onto a vertical wall, the effect of surface roughness on entrainment height is investigated in this study. The oil droplet size distribution on the impingement surface is measured using a Malvern particle size analyser, whereas the impingement velocity field is measured using particle image velocimetry technique. The impingement and entrainment profiles are captured through high-speed photography, and the entrainment height is identified from digital image processing. Results show that the entrainment heights range from 2 to 12 mm on the surface with a roughness of 0.3-4.5 μm when the impinge velocity is 3–5 m/s and the Sauter mean diameter of the impinging droplets is approximately 40 μm. The lowest entrainment height in all operating conditions is obtained at the surface roughness level of 1.1 μm.

中文翻译：

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表面粗糙度对油气混合物冲击垂直壁面夹带高度的影响

摘要 油气混合物从壁面夹带显着影响惯性分离器的性能。通过将油气混合物喷射到垂直壁上，本研究研究了表面粗糙度对夹带高度的影响。撞击表面上的油滴尺寸分布是使用马尔文粒度分析仪测量的，而撞击速度场是使用粒子图像测速技术测量的。撞击和夹带轮廓通过高速摄影捕获，夹带高度通过数字图像处理进行识别。结果表明，当撞击速度为 3-5 m/s 且撞击液滴的 Sauter 平均直径约为 40 μm 时，表面的夹带高度范围为 2-12 mm，粗糙度为 0.3-4.5 μm。