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Injection and coalescence of bubbles in a very viscous liquid

Published online by Cambridge University Press:  10 May 2005

F. J. HIGUERA
F. J. HIGUERA
Affiliation:
E. T. S. Ingenieros Aeronáuticos, Pza. Cardenal Cisneros 3, 28040 Madrid, Spain
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Abstract

The periodic generation of bubbles by injection of a gas at constant flow rate through an orifice at the bottom of a quiescent liquid of high viscosity is investigated numerically. The volume of the bubbles is determined as a function of a capillary number and a Bond number in the absence of inertial effects. Pairs of bubbles coalesce in the vicinity of the orifice when the capillary number is higher than a critical value that depends on the Bond number, but the final volume of the bubbles still follows a well-known scaling law at large capillary numbers. Qualitative experimental visualizations are presented that display the sequences of detachment and coalescence computed numerically.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 530 , 10 May 2005 , pp. 369 - 378
Copyright
© 2005 Cambridge University Press

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