A green function approach to shear viscosity coefficient |
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Authors: | A K Heblekar A S Wagh I M Boswarva |
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Institution: | (1) Department of Physics, Centre of Post-graduate Instruction and Research, University of Bombay, Panaji, Goa, India;(2) Department of Physics, University of the West Indies, Mona, Kingston 7, Jamaica |
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Abstract: | Modified transport equations are derived from Kadanoff and Baym kinetic equations, suitable for the study of thermal transport
coefficients. These equations include the Hartree average energy term which has been ignored in the previous studies of thermal
transport coefficients. They are linearised and the successive perturbation method is employed to solve them. The solutions
are applied to shear viscosity coefficient of gases and the results are compared with the recent experimental measurements
for several complex and simple gases. The potential assumed is a hard core one with a perturbation tail. The agreements are
particularly good for gases with low molecular weight and in the high temperature range. For complex molecules even in the
low temperature range, the agreement is better than the previous calculations. The formula derived yields the explicit temperature
dependence of the viscosity coefficient. |
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Keywords: | Green function viscosity coefficient Hartree energy |
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