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RESEARCH PAPERS

The Rise of Bubbles in a Vertical Shear Flow

[+] Author and Article Information
E. A. Ervin

Department of Mechanical and Aerospace Engineering, The University of Dayton, Dayton, OH 45469

G. Tryggvason

Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, MI 48109

J. Fluids Eng 119(2), 443-449 (Jun 01, 1997) (7 pages) doi:10.1115/1.2819153 History: Received December 25, 1994; Revised September 04, 1996; Online December 04, 2007

Abstract

Full numerical simulations of two- and three-dimensional bubbles in a shear flow, by a finite difference front tracking method, are presented. The effects of inertial, viscous, gravitational, and surface forces on the lift of a deformable bubble rising due to buoyancy in a vertical shear flow, are examined. Bubbles with a large surface tension coefficient migrate toward the downward moving fluid, as predicted analytically for a cylinder or a sphere in a shear flow. Bubbles with smaller surface tension deform, and generally migrate in the opposite direction. The combined effects of the shear flow and the buoyancy deform the bubble in such a way that the circulation around the deformed bubbles is opposite to that of undeformed bubbles.

Copyright © 1997 by The American Society of Mechanical Engineers
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