Density Functional Theory and the Capillary Evaporation of a Liquid in a Slit |
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Authors: | Varga Boda Henderson Sokolowski |
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Institution: | Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah, 84602-5700 |
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Abstract: | Density functional theory is applied to a Lennard-Jones fluid near a single hard wall and in a slit formed by two walls. We use some simplified versions of the Weeks-Chandler-Andersen (WCA) and the Barker-Henderson (BH) theories. Only the most crude mean field version of the WCA theory, in which the hard-sphere correlation function is set equal to unity for all distances, seems useful. Use of the full WCA approximation is impractical because the effective hard-sphere diameter is density dependent. Generally, the best results are obtained using the BH macroscopic compressibility approximation. Our earlier study of "evaporation" of Lennard-Jones molecules in a slit is extended to other densities using the mean field theory. Copyright 2000 Academic Press. |
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