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Droplets sliding over shearing surfaces studied by molecular dynamics
Author(s) -
Derksen J. J.
Publication year - 2015
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14930
Subject(s) - shearing (physics) , mechanics , molecular dynamics , materials science , dynamics (music) , chemical physics , composite material , chemistry , physics , computational chemistry , acoustics
Through molecular dynamics, the sliding motion of a liquid drop embedded in another liquid over a substrate as a result of a shear flow is studied. The two immiscible Lennard‐Jones liquids have the same density and viscosity. The system is isothermal. Viscosity, surface tension, and static contact angles follow from calibration simulations. Sliding speeds and drop deformations (in terms of dynamic contact angles) are determined as a function of the shear rate. The latter is nondimensionalized as a capillary number (Ca) that has been varied in the range 0.02–0.64. For Ca up to 0.32, sliding speeds are approximately linear in Ca. For larger Ca, very strong droplet deformations are observed. © 2015 American Institute of Chemical Engineers AIChE J , 61: 4020–4027, 2015