Abstract
Momentum transfer in a sheared liquid is analyzed with a focus on the intermolecular momentum transfer (IMT). The IMT, which determines shear viscosity of liquids, is examined based on the result of molecular dynamics (MD) simulations for a simple liquid modeled by the Lennard-Jones (12-6) potential. Distortion of liquid structure, which is characterized by spherical symmetry breaking in the pair distribution of molecules, is reproduced by the MD simulation and its effect on the characteristics of the IMT, which includes a negative momentum transfer in a certain range of intermolecular distance, is discussed. The appearance of negative IMT depends on characteristics of the intermolecular potential, and it is predicted that the IMT will show a different response for repulsive soft-sphere liquids.
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