Numerical simulation of stick-slip contact line motion and particle line formation in dip coating

Numerical simulation is performed for stick-slip contact line motion and particle line formation in dip coating. The liquid-gas interface as well as the liquid-gas-solid contact line is tracked by a sharp-interface level-set method, which is extended to include the effect of phase change, to implement the contact angle model for the stick-slip contact line motion, and to treat the particle deposition on a moving substrate. The computations demonstrate that the particle line formation is directly related to the stick-slip contact line motion. The effects of initial particle concentration, substrate withdrawal velocity, substrate temperature and contact angle on the particle line formation in dip coating are investigated. (C) 2016 Elsevier Ltd. All rights reserved.