Dynamic van der Waals Theory of two-phase fluids in heat flow

Details Dynamic van der Waals Theory of two-phase fluids in heat flow Dynamic van der Waals Theory of two-phase fluids in heat flow

2005-01-06

arxiv.org/abs/cond-mat/0501097v2

Physics

Condensed Matter

Soft Condensed Matter

6pages, 8figures

Scientific paper

10.1103/PhysRevLett.94.054501

We present a dynamic van der Waals theory. It is useful to study phase separation when the temperature varies in space. We show that if heat flow is applied to liquid suspending a gas droplet at zero gravity, a convective flow occurs such that the temperature gradient within the droplet nearly vanishes. As the heat flux is increased, the droplet becomes attached to the heated wall that is wetted by liquid in equilibrium. In one case corresponding to partial wetting by gas, an apparent contact angle can be defined. In the ther case with larger heat flux, the droplet completely wets the heated wall expelling liquid.

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