Effects of bubble deformation on the viscosity of dilute suspensions
Effects of bubble deformation on the viscosity of dilute suspensions
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DOI：
10.1016/s0377-0257(02)00013-7
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发表时间：
2002-04-20
影响因子：
3.1
通讯作者：
Manga, M
中科院分区：
文献类型：
--
作者：
Rust, AC;Manga, M
采用旋转圆柱体Couette流变仪研究了低雷诺数、稀释和无表面活性剂的气泡悬浮液在简单剪切作用下的相对粘度（mu(rel) =悬浮液粘度/悬浮液粘度）。实验条件对应于I级毛细管数（Ca），并将以往的实验、理论和数值结果联系起来，这些结果要么集中在Ca远小于1，要么集中在Ca远大于1。对于小Ca，悬浮液剪切变薄，mu（rel）为bbbb1。在大Ca时，mu（rel）接近于小于1的常数。这些结果可以通过尺度分析来解释，该分析考虑了当气泡被流动变形时，气泡内部和周围的粘性耗散区域如何变化。(C) 2002 Elsevier Science B.V.版权所有
The relative viscosity (mu(rel) = 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 I and bridge previous experimental, theoretical and numerical results that focused on either Ca much less than 1 or Ca much greater than 1. The suspensions are shear thinning with mu(rel) > 1 for small Ca. At large Ca, mu(rel) 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. (C) 2002 Elsevier Science B.V. All rights reserved.