JIAO Yun-long, LIU Xiao-jun, PANG Ming-hua, LIU Kun. Study of Contact Angle Hysteresis at Moving Contact Lines Based on CFD Simulation and Mechanical Analysis[J]. Applied Mathematics and Mechanics, 2016, 37(1): 14-26. doi: 10.3879/j.issn.1000-0887.2016.01.002
Citation: JIAO Yun-long, LIU Xiao-jun, PANG Ming-hua, LIU Kun. Study of Contact Angle Hysteresis at Moving Contact Lines Based on CFD Simulation and Mechanical Analysis[J]. Applied Mathematics and Mechanics, 2016, 37(1): 14-26. doi: 10.3879/j.issn.1000-0887.2016.01.002

Study of Contact Angle Hysteresis at Moving Contact Lines Based on CFD Simulation and Mechanical Analysis

doi: 10.3879/j.issn.1000-0887.2016.01.002
Funds:  The National Natural Science Foundation of China(51375132)
  • Received Date: 2015-08-28
  • Rev Recd Date: 2015-12-07
  • Publish Date: 2016-01-16
  • Contact angle hysteresis (CAH) is one of the significant phenomena in the process of droplet spreading on solid surfaces. It plays an important role in mechanical lubrication and other industrial applications. CAH on both smooth and rough surfaces was studied through parametric analysis based on numerical simulation and ISO 25178. The changes of kinetic energy of molecules, liquid pressure and flow velocity near the moving contact line (MCL) related to the mechanism of CAH were investigated with the Flow-3D software. In addition, quantitative tests of the relationship between surface roughness and CAH were conducted with several key parameters according to ISO 25178. The results show that the contact angle is not usually equal to the Young’s contact angle because of the influence of surface roughness; the dynamic balance between sliding force (caused by Laplace pressure and droplet gravity) and viscous resistance (caused by surface roughness) at the MCL is the main reason for the occurrence of CAH. Moreover, CAH is closely related to surface topography, the CAH results on various substrates with different micro-texture types show great differences. The present study enhances the understanding of the CAH mechanism from a micro-perspective and provides some guidance for the practical manufacture of surfaces with better lubrication property and wettability.
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