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Interplay of flow-induced phase separations and rheological behavior of complex fluids in shearbanding flow
Europhys. Lett. FIELD Full Journal Title:Europhysics Letters. 2002;60(5):691-697.
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Abstract
The generic behavior of both flow-induced phase sepns. and rheol. responses of complex fluids has been studied. We solve a two-fluid model numerically in a strong-flow regime without using the diffusive equation linearization and adiabatic approxn. Our results show that the formation of the mech. shear bands and the fluid compn. bands can be closely interrelated. We have identified correlations between the microstructure evolution and rheol., and also different mechanisms to reach the steady state. The rheol. signature of demixing fluids under shear is that the dependence of the steady-state shear stress on shear rate changes from non-linear to linear. The model selects a steady-state stress in a natural phys. way for non-monotonic constitutive equations under strong flow. [on SciFinder(R)]
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- Journal 0295-5075 written in English