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本文建立了粗糙固体表面上液滴铺展过程的理论模型并采用了格子Boltzmann方法进行数值模拟,研究了粗糙与光滑表面上液滴铺展过程的形貌变化。研究结果表明,无论表面光滑还是粗糙,液滴都沿着半径方向逐渐铺展,整体首先呈帽形,随着时间的推移,液滴在表面铺展成一平面。粗糙表面与光滑表面铺展特性间的差异主要在于粗糙表面液滴受到粗糙元干扰,其铺展形状随时间推移由圆形向八边形过渡.粗糙元间隙的增大导致液滴润湿半径增大,液滴厚度沿半径方向变化梯度降低。
In this paper, a theoretical model of liquid droplet spreading on a rough solid surface was established. The lattice Boltzmann method was used to simulate the droplet spreading process on rough and smooth surfaces. The results show that no matter whether the surface is smooth or rough, the droplets gradually spread along the radius direction, and the whole is first hat-shaped. Over time, the droplets spread on the surface into a plane. The difference between the roughened surface and the spreadable surface is that the droplet on the roughened surface is disturbed by the roughening element whose spreading shape transitions from the circle to the octagon over time.The increase in the roughness element gap leads to an increase in the droplet wetting radius , The thickness of the drop along the radial direction of the gradient decreases.