Dynamic phase separation of a binary polymer liquid with asymmetric composition under rheometric flow

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Abstract

Without linearization of the diffusive equation or the adiabatic approxn., we have numerically solved the two-fluid model to study dynamic phase sepn. of a binary polymer liq. with asym. compn. under shear flow in the infinite Peclet no. regime. The details of the model and the simulation technique are presented. The simulations reproduce shear-induced demixing, i.e., the shift of the position of the phase boundary from the equil. phase diagram, reported in literature. Our results show that the rheol. signature of demixing fluids under shear is the change from non-linear to linear of the dependence of the steady-state shear stress on shear rate within that range of shear rates in which the demixing takes place. We have also obsd. an interesting mechanism by which the stable band structure is reached; there is a transition from fine bands to waves, then to droplets, and finally to much coarser bands. [on SciFinder(R)]

Keyword(s)

Flow; Mixing (demixing; Phase separation; Polymers Role: PRP (Properties) (dynamic phase sepn. of a binary polymer liq. with asym. compn. under rheometric flow) ; Shear stress; Simulation and Modeling (dynamic phase sepn. of a binary polymer liq. with asym. compn. under rheometric flow) ; dynamic phase sepn. of a binary polymer liq. with asym. compn. under rheometric flow); phase sepn binary polymer liq rheometric flow

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