期刊
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
卷 36, 期 -, 页码 58-71出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2012.04.001
关键词
Water droplet; Coalescence; Binary collision; CFD; VOF
Coalescence of two water droplets in the oil was simulated using Computational Fluid Dynamics (CFD) techniques. The finite volume numerical method was applied to solve the Navier-Stokes equations in conjunction with the Volume of Fluid (VOF) approach for interface tracking. The effects of some parameters consisting of the collision velocity, off-center collision parameter, oil viscosity and water-oil interfacial tension on the coalescence time were investigated. The simulation results were validated against the experimental data available in the literature. The results revealed that quicker coalescence could be achieved if the head-on collisions occur or the droplets approach each other with a high velocity. In addition, low oil viscosities or large water-oil interfacial tensions cause less coalescence time. Moreover, a correlation was developed to predict coalescence efficiency as a function of the mentioned parameters. (c) 2012 Elsevier Inc. All rights reserved.
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