Irreversible Shear-Activated Aggregation in Non-Brownian Suspensions

by: J Guery, E Bertrand, C Rouzeau, P Levitz, DA Weitz, J Bibette

Physical Review Letters, Vol. 96, No. 19. (2006)

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Abstract

We have studied the effect of shear on the stability of suspensions made of non-Brownian solid particles. We demonstrate the existence of an irreversible transition where the solid particles aggregate at remarkably low volume fractions (0.1). This shear-induced aggregation is dramatic and exhibits a very sudden change in the viscosity, which increases sharply after a shear-dependent induction time. We show that this induction time is related exponentially to the shear rate, reflecting the importance of the hydrodynamic forces in reducing the repulsive energy barrier that prevents the particles from aggregating.

@article{citeulike:2709675, abstract = {We have studied the effect of shear on the stability of suspensions made of non-Brownian solid particles. We demonstrate the existence of an irreversible transition where the solid particles aggregate at remarkably low volume fractions (0.1). This shear-induced aggregation is dramatic and exhibits a very sudden change in the viscosity, which increases sharply after a shear-dependent induction time. We show that this induction time is related exponentially to the shear rate, reflecting the importance of the hydrodynamic forces in reducing the repulsive energy barrier that prevents the particles from aggregating.}, author = {Guery, J. and Bertrand, E. and Rouzeau, C. and Levitz, P. and Weitz, D. A. and Bibette, J. }, citeulike-article-id = {2709675}, doi = {10.1103/PhysRevLett.96.198301}, journal = {Physical Review Letters}, keywords = {hydrodynamics, shear, weitz}, number = {19}, posted-at = {2008-04-23 20:00:12}, priority = {3}, publisher = {APS}, title = {Irreversible Shear-Activated Aggregation in Non-Brownian Suspensions}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000096000019198301000001\&idtype=cvips\&gifs=yes}, volume = {96}, year = {2006} }

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TY - JOUR ID - citeulike:2709675 TI - Irreversible Shear-Activated Aggregation in Non-Brownian Suspensions JF - Physical Review Letters VL - 96 IS - 19 PB - APS N2 - We have studied the effect of shear on the stability of suspensions made of non-Brownian solid particles. We demonstrate the existence of an irreversible transition where the solid particles aggregate at remarkably low volume fractions (0.1). This shear-induced aggregation is dramatic and exhibits a very sudden change in the viscosity, which increases sharply after a shear-dependent induction time. We show that this induction time is related exponentially to the shear rate, reflecting the importance of the hydrodynamic forces in reducing the repulsive energy barrier that prevents the particles from aggregating. KW - hydrodynamics KW - shear KW - weitz AU - Guery, J AU - Bertrand, E AU - Rouzeau, C AU - Levitz, P AU - Weitz, DA AU - Bibette, J PY - 2006/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000096000019198301000001&idtype=cvips&gifs=yes ER -

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