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S10 Fluidodināmica de Escoamento Multifįsico |
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Titulo:
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HYDRODYNAMIC AND RHEOLOGY OF A DILUTE EMULSION WITH HIGH VISCOSITY RATIO
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Resumo :
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THE SMALL DEFORMATION THEORY IS APPLIED FOR STUDYING THE RHEOLOGICAL BEHAVIOR OF A DILUTE EMULSION UNDERGOING A SIMPLE SHEAR FLOW. THIS ARTICLE SHOWS THE LINK BETWEEN THE MACRORHEOLOGY WITH THE DEFORMATION AND ORIENTATION OF THE DROPLETS BY THE FLOW (MICROMECHANICS). THE SHAPE AND THE INTERFACIAL VELOCITY OF A STATIONARY DROP IS USED TO COMPUTE THE CONTRIBUTION OF THE DROP TO THE EFFECTIVE STRESS TENSOR OF THE EMULSION. THE OFF-DIAGONAL SHEAR COMPONENT AND THE NORMAL STRESS DIFFERENCES ARE CALCULATED. THE THEORY IS COMPARED WITH RESULTS FROM NUMERICAL SIMULATIONS AT A HIGH VISCOSITY RATIO. AN IMPORTANT CONCLUSION IS THAT A DILUTE EMULSION COMPOSED BY VISCOUS DROPS EXHIBITS SHEAR-THINNING AND ELASTIC BEHAVIOR AT MODERATE SHEAR RATES.
KEYWORDS: RHEOLOGY, DILUTE EMULSION, DROP DEFORMATION}
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Autores :
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Cunha, Francisco Ricardo
Toledo, Ronne
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Trabalho Completo :
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