Theory of surface tension for molecular fluids
- 1 July 1975
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 30 (1) , 179-192
- https://doi.org/10.1080/00268977500101861
Abstract
The Kirkwood-Buff statistical mechanical theory of surface tension γ for monatomic fluids is extended to molecular fluids. A rigorous expression for γ is derived in terms of the angular pair distribution function f(z 1 R 12θ1θ2) of an equilibrium fluid-fluid system (liquid-gas, liquid-liquid, or gas-gas). The Fowler approximation is applied for the liquid-gas case, and a simple expression for γ is derived in terms of the bulk liquid angular pair correlation function g(R 12θ1θ2). Thermodynamic perturbation theory for g(R 12θ1θ2) is also used to calculate γ theoretically. The theoretical results are compared with experimental values.Keywords
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