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Dynamics of a mechanical interface in shear-banded flow
Europhysics Letters. 1999;46(4):542-548.
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Abstract
Shear banding of wormlike micelle soln. was studied in the context of constitutive instability of the Johnson-Segalman (JS) model plus Newtonian stress. The authors have incorporated a higher-order gradient term of the deformation-rate tensor into the JS model for studying the dynamics of a mech. interface in shear-banded flow. Two-dimensional modeling of the new model was carried out by a general Lagrangian-Eulerian scheme. Within the unstable region, results show that the new term plays an important role in selecting steady-state shear stress and the selected stress is independent of the nominal shear rate. The transit period of reaching the steady state can be much longer than the intrinsic relaxation time of the JS fluid. The authors have verified the exptl. evidence on the existence of mech. metastable regime, over which hysteresis in flow curve might occur. The model captures many features of exptl. results on shear banded flow. [on SciFinder(R)]
Keyword(s)
Flow (shear; Hysteresis (exptl. evidence on existence of mech. metastable regime, over which hysteresis in flow curve might occur in shear-banded flow) ; Micelles (shear banding of wormlike micelle soln.); Shear stress (role of higher-order gradient term of deformation-rate tensor in selecting steady-state shear stress in shear-banded flow) ; deformation rate tensor steady state shear stress; dynamics of mech. interface in shear-banded flow); mech interface dynamics shear banded flow model; wormlike micelle shear banding model
Bibliographic metadata
- CAN 131:63772 66-2 Surface Chemistry and Colloids Journal 0295-5075 written in English