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Confinement enhanced viscosity vs shear thinning in lubricated ice friction (2402.04700v1)
Published 7 Feb 2024 in cond-mat.mes-hall and physics.chem-ph
Abstract: The ice surface is known for presenting a very small kinetic friction coefficient, but the origin of this property remains highly controversial to date. In this work, we revisit recent computer simulations of ice sliding on atomically smooth substrates, using newly calculated bulk viscosities for the TIP4P/Ice water model. The results show that spontaneously formed premelting films in static conditions exhibit an effective viscosity which is about twice the bulk viscosity. However, upon approaching sliding speeds in the order of m/s, the shear rate becomes very large, and the viscosities decrease by several orders of magnitude. This shows that premelting films can act as an efficient lubrication layer despite their small thickness, and illustrates an interesting interplay between confinement enhanced viscosities, and shear thinning. Our results suggest that the strongly thinned viscosities that operate under the high speed skating regime could largely reduce the amount of frictional heating.
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- The thermodynamic state of the reference viscosity used in the work of [26] was not reported in the paper, but communicated to us privately.
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- The timestep of the simulations was not reported in Ref.[26]. Real time estimates here are obtained using dt=1𝑑𝑡1dt=1italic_d italic_t = 1 fs, as communicated to us privately by the authors.
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