The behavior of simple fluids under shear is investigated using molecular dynamics simulations. The simulated system consists of a fluid confined between two atomistic walls which are moved in opposite directions. Two approaches for shear flow simulations are compared: in one case, the sheared fluid is not thermostatted and only the confining walls are maintained at a constant temperature, while in the other, a thermostat is employed to keep the entire mass of the sheared fluid at a constant temperature. In the first case the sheared fluid undergoes significant viscous heating at the shear rates investigated, consistent with experimental observations and with theoretical predictions. Most simulations to date, however, have used the second approach which is akin to studying a fluid with infinite thermal conductivity. It is shown here that results for transport coefficients are significantly affected by the thermostat; in fact, the transport properties of the fluid determined using the two methods exhibit a qualitatively different shear rate dependence. It is also shown that the temperature profiles observed in our simulations can be described by continuum mechanics, provided the temperature dependence of the viscosity and thermal conductivity is taken into account.
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15 August 1997
Research Article|
August 15 1997
Molecular simulation and continuum mechanics study of simple fluids in non-isothermal planar couette flows
Rajesh Khare;
Rajesh Khare
Department of Chemical Engineering and Rheology Research Center, Theoretical Chemistry Institute and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
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Juan de Pablo;
Juan de Pablo
Department of Chemical Engineering and Rheology Research Center, University of Wisconsin, Madison, Wisconsin 53706
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Arun Yethiraj
Arun Yethiraj
Theoretical Chemistry Institute and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
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J. Chem. Phys. 107, 2589–2596 (1997)
Article history
Received:
August 15 1996
Accepted:
May 16 1997
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A related article has been published:
Comment on “Molecular simulation and continuum mechanics study of simple fluids in nonisothermal planar Couette flows” [J. Chem. Phys. 107, 2589 (1997)]
Citation
Rajesh Khare, Juan de Pablo, Arun Yethiraj; Molecular simulation and continuum mechanics study of simple fluids in non-isothermal planar couette flows. J. Chem. Phys. 15 August 1997; 107 (7): 2589–2596. https://doi.org/10.1063/1.474570
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