Comment on 'Computer simulation of two-phase immiscible fluid motion in unsaturated complex fractures using a volume of fluid method' by Hai Huang, Paul Meakin, and Moubin Liu

摘要

The analytical solution presented by Dragila and Weisbrod [2003] is correct provided that the dynamic contact angle and effect of the trailing film are appropriately linked with the velocity (e.g., as proposed by Bico and Quere [2001] and presented herein). The deviation from Poiseuille law is mainly due to the advancing dynamic contact angle, and the correction due to the trailing film represents only 30% of the contact angle correction [Bico and Quere, 2001]. Finally, the results confirm that the three contact angle model used in the VOF solution of Huang et al. [2005] is generally correct, and points to the need to include a more general treatment into the VOF model along the lines presented in this comment.