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Using published experimental data on the thermal conductivity, mutual diffusivity, and heats of transport, the degree of coupling between heat and mass flows has been calculated for binary and ternary nonideal liquid n~ixtures. The binary mixtures consist of two types: the first is six systems of sis-to-eight-cai-boil straight and branchcd chain alkanes in chloroform and in carbon tetrachloride; and the second is mixtures of carbon tetrachloride with benzene. toluene, 2-propanone, n-hcxane, and 11-octane. The ternary mixture considered is toluene-chlorobenzeae-bromobenzene. The published data are available at 35OC. 30°C and 35OC and ambient pressurc. Using the linear nonequilibi-ium thern~odynainics( LNET) and the dissipation-pl~enon~enologicale quation (DPE) approach, the effects of concentration, temperature, molecular weight, chain-length, solute, solvent, and brailchiilg on the degree of coupling are examined. The extent of coupling and the thermal diffusion ratio are expressed in terms of the transport coefficients to obtain a better understanding of the interactions between heat and mass flows in liquid n~ixtures.I t is found that the compositioil of the heavy component bromobenzene changes the direction and magnitude of the two-flow coupling in the ternary mixture. O 2001 Elsevier Science Ltd. All rights reserved.