The 9th International Conference on Multiscale Materials Modeling

講演情報

Symposium

O. Tribology and Interface: Multi-Scale, Multi-Physics, and Multi-Chemistry Phenomena in Friction, Lubrication, Wear, and Adhesion

[SY-O2] Symposium O-2

2018年10月29日(月) 15:45 〜 17:30 Room5

Chairs: Mark Owen Robbins(Johns Hopkins University, United States of America), Tasuku Onodera(Hitachi, Ltd., Japan)

[SY-O2] Droplet Spreading on a Surface Exhibiting Solid-liquid Interfacial Premelting

Yang Yang1, Brian B Laird2 (1.East China Normal University, China, 2.University of Kansas, United States of America)

We study the spreading kinetics of Pb(l) droplets on an Al(111) substrate using MD simulation. The Al-Pb solid-liquid interface was found [Phys. Rev. Lett, 110, 096102 (2013)] to exhibit premelting below the Tm(Al). Because the Al(111) free surface does not premelt, the spreading of the droplet is accompanied by a transition from a faceted to a premelted surface. We examine the effect of this premelting on the droplet spreading kinetics and compare the results to two standard mechanisms of droplet spreading: hydrodynamic spreading, in which energy dissipates through viscous relaxation, and kinetic spreading, where friction dominates. When premelting is present, kinetic spreading is observed at intermediate times, with exponential relaxation at long times. For two non-premelting Al/Pb interfaces (one faceted surface at 625K and one where premelting was suppressed) hydrodynamic spreading is seen instead at intermediate times. We also examine the effect of premelting on the droplet equilibrium contact angle.