The diffusion thermoeffect in ternary nonelectrolyte liquid mixtures

Expressions for that portion of the heat flux which is due to composition gradients in multicomponent nonelectrolyte liquid mixtures have been formulated in terms of heats of transport. The resultant thermal energy equation in combination with component mass balance equations constitute coupled partial differential equations descriptive of the diffusion thermoeffect in liquid mixtures. These equations were solved with a double perturbation technique subject to initial and boundary conditions consistent with experimental design conditions considered appropriate for successful measurement of multicomponent heats of transport. Based on the adiabatic type cell, the expected temperature response, dependent on cell variables, experimental conditions, and system thermophysical properties, has been modeled to provide design information for successful and optimum heats of transport measurements. In ternary systems, the two independent heats of transport can be experimentally determined from temperature response me...