603 research outputs found
Resistances for heat and mass transfer through a liquid-vapor interface in a binary mixture
In this paper we calculate the interfacial resistances to heat and mass
transfer through a liquid-vapor interface in a binary mixture. We use two
methods, the direct calculation from the actual non-equilibrium solution and
integral relations, derived earlier. We verify, that integral relations, being
a relatively faster and cheaper method, indeed gives the same results as the
direct processing of a non-equilibrium solution. Furthermore we compare the
absolute values of the interfacial resistances with the ones obtained from
kinetic theory. Matching the diagonal resistances for the binary mixture we
find that kinetic theory underestimates the cross coefficients. The heat of
transfer is as a consequence correspondingly larger.Comment: 15 pages, 5 figure
Nonequilibrium translational effects in evaporation and condensation
This paper shows how mesoscopic nonequilibrium thermodynamics can be applied
to condensation and evaporation. By extending the normal set of thermodynamic
variables with two internal variables, we are able to give a new theoretical
foundation for a mechanism of condensation that has been proposed from
molecular simulation results. The flux does not follow a simple Arrhenius
formula for small activation energies which are relevant here.Comment: To appear in J. Chem. Phy
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