Y. Demirel et Si. Sandler, Effects of concentration and temperature on the coupled heat and mass transport in liquid mixtures, INT J HEAT, 45(1), 2002, pp. 75-86
Using published experimental data on the thermal conductivity, mutual diffu
sivity, and heats of transport, the degree of coupling between heat and mas
s flows has been calculated for binary and ternary nonideal liquid mixtures
. The binary mixtures consist of two types: the first is six systems of six
-to-eight-carbon straight and branched chain alkanes in chloroform and in c
arbon tetrachloride; and the second is mixtures of carbon tetrachloride wit
h benzene, toluene, 2-propanone, n-hexane, and n-octane. The ternary mixtur
e considered is toluene-chlorobenzene-bromobenzene. The published data are
available at 25 degreesC, 30 degreesC and 35 degreesC and ambient pressure.
Using the linear nonequilibrium thermodynamics (LNET) and the dissipation-
phenomenological equation (DPE) approach, the effects of concentration, tem
perature, molecular weight, chain-length, solute, solvent, and branching on
the degree of coupling are examined. The extent of coupling and the therma
l diffusion ratio are expressed in terms of the transport coefficients to o
btain a better understanding of the interactions between heat and mass flow
s in liquid mixtures. It is found that the composition of the heavy compone
nt bromobenzene changes the direction and magnitude of the two-Flow couplin
g in the ternary mixture. (C) 2001 Elsevier Science Ltd. All rights reserve
d.