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In some binary fluids, mass transport is observed under a temperaturegradient. This phenomenon is called the Soret effect. In this study, we discussthe influence of inter-particle interaction. We considered equimolar binaryLennard-Jones fluids with a mass contrast, whereas the interaction was commonfor all the particle pairs with various cut-off lengths. We performed moleculardynamics simulations of such fluids under equilibrium to obtain thecross-transport coefficients L1q between the fluxes of mass and heat. Thesimulation revealed that this quantity strongly depends on the cut-off length.Further, we decomposed the heat flux into kinetic and potential contributionsand calculated the cross-correlations between decomposed fluxes and the massflux. The result indicates that the potential contribution dominates L1q,implying that the Soret coefficient is altered by the inter-particleinteraction.

Effects of attractive inter-particle interaction on cross-transport coefficient between mass and heat in binary fluids