We have calculated generalized longitudinal, ηL(k), shear, ηS(k), and bulk, ηB(k) viscosity of argon at two thermodynamic states by molecular-dynamics simulation. Bulk viscosity has been evaluated with two independent methods that give results in good agreement. We find that bulk viscosity stays positive at all wave numbers k, and show that negative values of ηB(k) are due to a straightforward (and incorrect) extension to finite k’s of the relation ηB(k)=ηL(k)−4ηS(k)/3, only valid at vanishing k’s.
No takes yet. Share an insight, caveat, or question.
Bertolini et al. (2001) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: