Effect of transition zone and nonadditivity contribution on surface tension and surface energy of liquid argon near the triple point
Abstract
Quantities are calculated from the extended formulas, based on the classical statistical mechanics, for the cases of a linear, a cubic, and a Fermi density profile. Several approximate representations of the radial distribution function are introduced in the transition zone. It is shown that the radial distribution function in the interface region cannot be appropriately obtained by interpolation between that in the bulk liquid and that in the bulk vapor for most part of the regions in the transition zone. The nonadditivity contribution to the surface energy is derived as an integral involving intermolecular potentials and molecular distribution functions. A sextuple integral to obtain the threebodied correction to the surface energy can be calculated, which is about 2.4 + or 0.1 erg/sq cm for liquid argon at 85 K. The transition zone width can be determined approximately from the experimental value of the surface energy.
 Publication:

Ph.D. Thesis
 Pub Date:
 May 1977
 Bibcode:
 1977PhDT.........7U
 Keywords:

 Argon;
 Interfacial Tension;
 Surface Energy;
 Distribution Functions;
 Phase Transformations;
 Radial Distribution;
 Statistical Mechanics;
 Fluid Mechanics and Heat Transfer