方柱微结构表面熔渣接触角的数值模拟研究

利用VOF模型对在不同本征接触角及不同尺寸方柱结构表面上熔渣的接触角进行了二维数值模拟,并对熔渣在方柱结构上的接触角进行测量.测量结果显示,熔渣在不同的本征接触角及不同方柱结构尺寸的表面上均处于Cassie润湿状态.将模拟结果与含方柱结构尺寸的Cassie润湿状态的接触角方程计算结果进行比较发现:在本征接触角大于90°的涂层表面,方柱结构的存在增大了熔渣的表观接触角;模拟结果的接触角值与接触角方程计算值较为吻合,误差在10%以下.

Numerical simulation study on the contact angle of molten slag on the surface of square pillar microstructure

Using the VOF model, two-dimensional numerical simulation of the contact angle of the slag on the surface of the square column structure with different intrinsic contact angles and sizes was carried out. The contact angle of the slag on the square column structure was measured. The measurement results show that the slag is in the Cassie wetting state on the surface with different intrinsic contact angles and different square column structure sizes. The simulation results are compared with the square column structure. Comparing the simulation results with the calculated results of the contact angle equation of the Cassie wetting state with the square column structure size, it is found that on the coating surface with the intrinsic contact angle greater than 90°, the presence of the square column structure increases the appearance of the slag contact angle. The contact angle value of the simulation result is in good agreement with the calculated value by the contact angle equation, and the error is less than 10%.