Abstract Liquid Droplet in Contact with a Solid Surface.pdf
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1Liquid Droplet in Contact with a Solid Surface
S. Maruyama1, T. Kurashige, S. Matsumoto2, Y. Yamaguchi and T. Kimura
Department of Mechanical Engineering, The University of Tokyo
7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan
Abstract
A liquid droplet in contact with a solid surface was simulated by the molecular dynamics
method, in order to study the microscopic aspects of the liquid-solid contact phenomena and
phase change heat transfer. Measured ‘contact angle’ was well correlated by the depth of the
integrated potential of the surface. The layered liquid structure near the surface was also
explained with the integrated potential field. Furthermore, the evaporation and condensation
through the droplet were simulated by preparing two solid surfaces with temperature differences
on the top and bottom of the calculation domain. Over all heat flux and temperature distributions
of droplets were measured.
Introduction
1 To whom correspondence should be addressed: e-mail: maruyama@photon.t.u-tokyo.ac.jp
2 Current address: Mechanical Engineering Laboratory, Agency of Industrial Science and
Technology /MITI, 1-2 Namiki, Tsukuba, Ibaraki 305, Japan
2 The microscopic mechanism of solid-liquid contact is fundamental to understanding phase
change phenomena such as dropwise condensation and the collapse of liquid film on a heated
surface. We have applied the molecular dynamics method to understand interphase phenomena,
such as surface tension [1,2] and liquid-solid contact [3]. Our previous study [3] demonstrated
that the droplet could be regarded as a semi-spherical shape except for a few layers of liquid
structure on the surface, and that the cosine of ‘contact angle’ was a linear function of the energy
scale of the interaction potential. In this report, by changing more parameters such as the length
scale of the interaction potential, system size, and temperature, we give a more general
description of the phenomena. As
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