Pii: S0377-0257(02)00013-7
نویسندگان
چکیده
The relative viscosity (μrel = suspension viscosity/suspending fluid viscosity) of low Reynolds number, dilute and surfactant-free bubble suspensions in simple shear is studied with a rotating cylinder, Couette rheometer. The conditions of the experiments correspond to capillary numbers (Ca) of order 1 and bridge previous experimental, theoretical and numerical results that focused on either Ca 1 or Ca 1. The suspensions are shear thinning with μrel > 1 for small Ca. At large Ca, μrel approaches a constant that is less than 1. These results are explained by a scaling analysis that considers how regions of viscous dissipation in and around bubbles change as bubbles are deformed by the flow. © 2002 Elsevier Science B.V. All rights reserved.
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تاریخ انتشار 2002