Understanding the asymmetry between advancing and receding microscopic contact angles.
Soft Matter
; 15(19): 3923-3928, 2019 May 15.
Article
em En
| MEDLINE
| ID: mdl-31011723
ABSTRACT
By means of molecular dynamics simulation, the advancing and receding microscopic contact angles were analyzed for a shear flow of two mono-atomic fluids confined between parallel non-polar solid walls. We defined the microscopic dynamic contact angle based on the coarse-grained microscopic density distribution of the fluids (the instantaneous interface method [Willard and Chandler, J. Phys. Chem. B, 2010, 114, 1954-1958]) near the moving contact line. We have found that the asymmetric change of fluid density near the wall with respect to the moving contact line results in a different dependence between the advancing and receding contact angles on the contact line velocity in a system where the two fluids across the interface have unequal wettability to the solid wall. This difference between the advancing and receding contact angles leads to different flow resistance caused by the advancing and receding contact lines, which should have impact on the industrial applications of the fine fluid transportation with contact lines.
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Base de dados:
MEDLINE
Idioma:
En
Revista:
Soft Matter
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Japão