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论文类型：期刊论文

发表时间：2017-10-01

发表刊物：INTERNATIONAL JOURNAL OF MULTIPHASE FLOW

收录刊物：SCIE、EI

卷号：95

页面范围：84-90

ISSN号：0301-9322

关键字：Non-Newtonian fluids; Carboxymethylcellulose; Single bubble; Visual experiment; Rising behavior

摘要：This work is an experimental study of the rising behavior of single air bubbles in infinite stagnant non Newtonian liquids. Aqueous solutions of carboxymethyl cellulose (CMC) are selected to study the effect of rheological properties. The high speed photography is employed to record the bubble motion in CMC solutions. The bubble size, rising trajectory, bubble shape and velocities are determined by digital image processing technique. As expected, the rheological properties have great influence on the rising behavior of single bubble. In the less concentrated CMC solutions, the bubble rising process can be divided into three stages according to spatial evolution of bubble shape. The deformation changes the trajectories of rising bubbles and bubble hydrodynamics. As the solution concentration increases, the transitional stage gradually disappears. In the most concentrated CMC solution, the first continuous shape flattening stage is directly followed by a rising process with bubble shape basically constant, the rectilinear path and constant rising velocity. Dimensional analysis is performed to formulate a general dimensionless correlation for the deformation and motion of bubbles in infinite liquids by considering the rheological properties. (C) 2017 Elsevier Ltd. All rights reserved.