Dufour Effect, heat of transport, liquid mixtures


The heat of transport of carbon tetrachloride-cyclohexane liquid mixtures has been determined directly by Dufour effect experiments. The technique employs a withdrawable ''liquid gate'' to create a nonturbulent, sharp diffusional interface. The partial differential equations governing the barycentric velocity, composition, and temperature distributions are solved with a Crank-Nicholson implicit numerical scheme. This allows inclusion of the composition and temperature dependence of the thermodynamic and transport parameters. For mean mole fraction of carbon tetrachloride x1 between 0.34 and 0.55 and for mean temperature T between 295.13 and 296.43 degreesK, the best least squares fit of the data for the heat of transport 1 in kJ mol^-1 is 1=5.82+2.32 (x-1/2)+0.225 (T-295.82), with a calculated standard error of 0.087. Analysis of the same experiments indicates that the composition dependence of the thermal conductivity kappa of the mixture in the specified composition and temperature ranges is best given (in J m^-1s^-1K^-1 ) by ([partial-derivative] kappa/[partial-derivative] w1)T,p=0.0252 (w^1/2*2-0.032), where wj is mass fraction.

Original Publication Citation

R.L. Rowley and F.H. Horne, "The Dufour Effect. III. Direct Experimental Determination of Heats of Transport for the Carbon Tetrachloride Cyclohexane System", J. Chem. Phys. 72, 131 (198)

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Peer-Reviewed Article

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Ira A. Fulton College of Engineering and Technology


Chemical Engineering