Microscopic origins of the viscosity of a Lennard-Jones liquid

Giant slip length at a supercooled liquid-solid interface

“…Different models have been proposed in order to ratio-nalize the temperature dependence of the viscosity η, the friction coefficient λ and the slip length b. In particular, although its physical relevance in liquids is still under investigation [9], Eyring theory (also called molecular kinetic theory) assumes that flow is an activated process: in order to jump from one position to a neighbouring one, a given molecule has to overcome an energy barrier E a . This can be applied both in the bulk flow, leading to an Arrhenian viscosity η ∝ exp {E a,viscous /(k B T )} [10], and in the flow near the wall, leading to an Arrhenian friction coefficient λ ∝ exp {E a,friction /(k B T )} [11,12].…”