EFFECTS OF SURFACE-ROUGHNESS ON WETTING (THEORETICAL)
EFFECTS OF SURFACE-ROUGHNESS ON WETTING (THEORETICAL)
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DOI：
10.1016/0021-9797(77)90251-x
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发表时间：
1977-01-01
影响因子：
9.9
通讯作者：
MASON, SG
中科院分区：
文献类型：
--
作者：
HUH, C;MASON, SG
固体表面粗糙度对液体润湿性的影响，已从理论上使用机械参数进行了研究。通过计算液滴在粗糙表面上的平衡形状，得到了三相接触线上的真实（或微观）平衡接触角与固体几何轮廓平面上宏观观察到的表观接触角之间的关系。通过扩展Shuttleworth和Bailey的建议，我们提供了一个合理的解释滞后的下降的形状和接触角，我们评估固体表面的同心槽。为了计算固体表面上的液体的平衡液滴形状，其粗糙度比同心凹槽更现实，我们采用了近似求解Young-Laplace方程的形状的扰动方法。虽然接触角和液滴形状的滞后不能通过该方法进行评估，但当表面粗糙度具有十字槽、六边形槽和径向槽的形式时，表观接触角和局部接触线位置被近似地预测。具有随机粗糙度的表面也被认为是和著名的Wenzel方程的修改后的形式推导出其中包括一个因素，除了传统的粗糙度因子的表面纹理。
The effect of roughness of a solid surface on its wettability by a liquid has been studied theoretically using mechanistic arguments. By calculating the equilibrium shape of a liquid drop resting on a rough surface, we obtain the relation between the true (or microscopic) equilibrium contact angle at the three-phase contact line and the apparent contact angle observed macroscopically at the geometrical contour plane of the solid. By extending a proposal of Shuttleworth and Bailey, we provide a plausible explanation for hysteresis of the drop shape and contact angle which we evaluate for solid surfaces with concentric grooves. To calculate the equilibrium drop shape of a liquid on a solid surface whose roughness is more realistic than concentric grooves, we employ a perturbation method of solving approximately the Young-Laplace equation for the shape. Although the hysteresis in contact angle and drop shape cannot be evaluated by the method, the apparent contact angle and the local contact line positions are approximately predicted when the surface roughness has the form of cross grooves, hexagonal grooves, and radial grooves. Surfaces having random roughness are also considered and a modified form of the well-known Wenzel equation is derived which includes a factor for surface texture in addition to the conventional roughness factor.