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Dynamics of oil droplet impacting and wetting on the inclined surfaces with different roughness
International Journal of Multiphase Flow ( IF 3.8 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.ijmultiphaseflow.2020.103501
Lingzi Wang , Jianmei Feng , Tiendat Dang , Xueyuan Peng

Abstract This study experimentally investigated the wetting process of an oil droplet impacting on the dry surface with different surface roughness (0.3 μm, 1.6μm, 2.9μm, 5.2 μm) from the front view. Experiments were conducted under three impacting Weber ranges with the inclined angles of 37.0°, 63.0°, and 75.5°. The droplet spread as a ‘pancake’ on the surface when the inclination angle was 37.0°, while the shape of an ‘avocado’ of the flowing oil layer was observed on higher inclined angle surfaces. The upper part of the ‘avocado’ became narrower when the inclined angle increased from 63.0° to 75.5°, which then grew longer with the increase in the impact We. The normalized transverse and longitudinal spreading displacement β x and β y were defined, whose evolution with normalized time was then obtained. Three stages of the β x were divided and analyzed. Under the same We range and inclined angle, the largest value of the maximum normalized droplet transverse spreading displacement ( β x m a x ) was obtained with the smoothest surface (0.3 μm) followed by the roughest surface (5.2 μm). β x m a x was affected by the surface roughness, which also influences the contact angle of the surface. When the surface roughness and the contact angle were regarded as two separate factors, it was found that for the transverse spreading, the lower the inclined angle, the more obvious effect of the surface roughness than that of the contact angle.

中文翻译:

不同粗糙度斜面油滴撞击润湿动力学

摘要 本研究从前视图实验研究了油滴撞击具有不同表面粗糙度(0.3 μm、1.6μm、2.9μm、5.2 μm)的干燥表面的润湿过程。在倾斜角为 37.0°、63.0° 和 75.5° 的三个冲击韦伯范围下进行实验。当倾斜角为 37.0°时,液滴在表面上以“煎饼”形式展开,而在更高倾斜角的表面上观察到流动油层的“鳄梨”形状。当倾斜角从 63.0° 增加到 75.5° 时,'avocado' 的上部变窄,然后随着影响 We 的增加而变长。定义了归一化的横向和纵向扩展位移 β x 和 β y,然后获得了它们随归一化时间的演变。β x 的三个阶段被划分和分析。在相同的 We 范围和倾斜角下,最大归一化液滴横向扩展位移 (β xmax ) 的最大值在最光滑的表面 (0.3 μm) 和最粗糙的表面 (5.2 μm) 之后获得。β xmax 受表面粗糙度的影响,这也影响表面的接触角。当将表面粗糙度和接触角视为两个独立的因素时,发现对于横向扩展,倾斜角越小,表面粗糙度的影响比接触角的影响越明显。3 μm) 其次是最粗糙的表面 (5.2 μm)。β xmax 受表面粗糙度的影响,这也影响表面的接触角。当将表面粗糙度和接触角视为两个独立的因素时,发现对于横向扩展,倾斜角越小,表面粗糙度的影响比接触角的影响越明显。3 μm) 其次是最粗糙的表面 (5.2 μm)。β xmax 受表面粗糙度的影响,这也影响表面的接触角。当将表面粗糙度和接触角视为两个独立的因素时,发现对于横向扩展,倾斜角越小,表面粗糙度的影响比接触角的影响越明显。
更新日期:2021-02-01
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