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Non-Newtonian Viscosity of Atomic Fluids in Shear and Shearfree Flows
No full textSimple shear and various simple shear-free flows with constant traceless velocity gradient are simulated at the microscopic level for an atomic fluid at a single state point. The dependence of the viscosity upon the strain rate is obtained for each specific flow and analyzed on the basis of the retarded motion expansion of the nonequilibrium pressure tensor. Within the investigated range of strain rate, the pressure and the internal energy follow a linear behavior in terms of the second scalar invariant of the strain-rate tensor which, as expected by symmetry, is common to all flows
Relaxation of a single chain molecule in good solvent conditions by Molecular Dynamics simulation
No full textDeformation and alignment of a chain molecule in solution subjected to a shear flow: a molecular dynamics simulation
No full textOn the signature of tensile blobs in the scattering function of a stretched polymer
No full textWe present Monte Carlo data for a linear chain with excluded volume subjected to a uniform stretching. Simulation of long chains (up to 6000 beads) at high stretching allows us to observe the signature of tensile blobs as a crossover in the scaling behavior of the chain scattering function for wave vectors perpendicular to stretching. These results and corresponding ones in the stretching direction allow us to verify for the first time Pincus prediction on scaling inside blobs. Outside blobs, the scattering function is well described by the Debye function for a stretched ideal chain
Liquid chlorine in shear and elongational flows: a nonequilibrium molecular dynamics study
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