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International Journal of Photoenergy
Volume 2017, Article ID 5128345, 8 pages
https://doi.org/10.1155/2017/5128345
Research Article

Numerical Simulation of Bubble Free Rise after Sudden Contraction Using the Front-Tracking Method

1School of Mechanical and Electrical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China
2Shangrao Normal College, Shangrao, Jiangxi 334001, China

Correspondence should be addressed to Peisheng Li; moc.361@z5991snducn

Received 29 July 2017; Revised 7 September 2017; Accepted 11 September 2017; Published 24 October 2017

Academic Editor: Ben Xu

Copyright © 2017 Ying Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Based on the front-tracking method (FTM), the movement of a single bubble that rose freely in a transverse ridged tube was simulated to analyze the influence of a contractive channel on the movement of bubbles. The influence of a symmetric contractive channel on the shape, speed, and trajectory of the bubbles was analyzed by contrasting the movement with bubbles in a noncontractive channel. As the research indicates, the bubbles became more flat when they move close to the contractive section of the channel, and the bubbles become less flat when passing through the contractive section. This effect becomes more obvious with an increase in the contractive degree of the channel. The symmetric contractive channel can make the bubbles first decelerate and later accelerate, and this effect is deeply affected by Reynolds number (Re) and Eötvös number (Eo).