Abstract
We elucidate a qualitative difference in the flow responses of structural distortions between fragile and network-forming strong liquids and argue its impact on a difference in shear-thinning mechanism: in fragile liquids, shear thinning can be attributed to the shear-induced reduction of the effective volume fraction, while in strong liquids, the shear-induced reduction of the effective activation energy may significantly accelerate in relaxation. Our simple expressions of the crossover shear rate from Newtonian to non-Newtonian behaviors, which are only expressed in experimental observables, are consistent with the molecular dynamics simulation results.
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