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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Molecular Dynamics Investigation on the Wetting Process of Liquid Droplet on a Solid Surface

Get access (open in a dialog) DOI: 10.1615/IHTC15.mlt.009055
pages 4987-4997

Аннотация

Molecular dynamics simulations are carried out in order to investigate the spreading motion of a cylindrical argon droplet on a solid surface. Spatial distributions of density, velocity and pressure tensor during the droplet spreading are calculated by taking the sample average of 500 equivalent simulation runs. The droplet spreads faster and takes longer to reach equilibrium shape on a solid surface with higher wettability. The lateral velocity inside the droplet is the largest at the adsorption layer near the solid surface, showing that a distinct velocity slip exists at the solidliquid interface. From the distribution of pressure on a solid surface, the contact line position and the vertical force at its proximity are calculated and it is found that the relation between the force acting on the contact line and the contact angle during spreading process is clearly different from that in an equilibrium droplet. The twodimensional distribution of the instantaneous pressure tensor is also obtained by applying the virial theorem, and an inhomogeneous pressure distribution that is not present in equilibrium state is observed.