A Study of the Liquid–Vapor Phase Change of Mercury Based on Irreversible Thermodynamics

[+] Author and Article Information
R. R. Adt

Department of Mechanical Engineering, University of Miami, Coral Gables, Fla.

G. N. Hatsopoulos, W. J. Bornhorst

Thermo Electron Engineering Corp., Waltham, Mass.

J. Heat Transfer 94(3), 257-261 (Aug 01, 1972) (5 pages) doi:10.1115/1.3449924 History: Received August 10, 1970; Online August 11, 2010


The object of this work is to determine the transport coefficients which appear in linear irreversible-thermodynamic rate equations of a phase change. An experiment which involves the steady-state evaporation of mercury was performed to measure the principal transport coefficient appearing in the mass-rate equation and the coupling transport coefficient appearing in both the mass-rate equation and the energy-rate equation. The principal transport coefficient σ, usually termed the “condensation” or “evaporation” coefficient, is found to be approximately 0.9, which is higher than that measured previously in condensation-of-mercury experiments. The experimental value of the coupling coefficient K does not agree with the value predicted from Schrage’s kinetic analysis of the phase change. A modified kinetic analysis in which the Onsager reciprocal law and the conservation laws are invoked is presented which removes this discrepancy but which shows that the use of Schrage’s equation for predicting mass rates of phase change is a good approximation.

Copyright © 1972 by ASME
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