Measurement of the concentration diffusion coefficient for He-Ar and Ne-Kr by a two bulb method |
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| Authors: | B P Mathur and S C Saxena |
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| Institution: | (1) Physics Department, University of Rajasthan, Jaipur, India;(2) Present address: Physics Department, Yale University, New Haven, Connecticut, USA;(3) Thermophysical Properties Research Center, Purdue University, Lafayette, Indiana, USA |
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| Abstract: | Summary A two bulb glass apparatus was used to measure the concentration diffusion coefficient of the binary gas systems He-Ar and Ne-Kr. The coefficients were determined for equimolar mixtures at temperatures between 0°C and 70°C. The diffusion was followed as a function of time by withdrawing samples and analyzing them in a specially designed thermal conductivity analyzer with high accuracy. The diffusion coefficients agree with earlier reported experimental values and with those obtained on the basis of the Chapman-Enskog theory in conjunction with the modified Buckingham exp-six and Lennard-Jones (12-6) intermolecular potentials. The smoothed values were used to predict viscosity and thermal conductivity of these mixtures as a function of composition and temperature. |
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