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Fluid Mechanics and Transport Phenomena
Mass transfer from a contaminated fluid sphere
Article first published online: 2 AUG 2010
DOI: 10.1002/aic.12391
Copyright © 2010 American Institute of Chemical Engineers (AIChE)
Additional Information
How to Cite
Saboni, A., Alexandrova, S., Karsheva, M. and Gourdon, C. (2011), Mass transfer from a contaminated fluid sphere. AIChE J., 57: 1684–1692. doi: 10.1002/aic.12391
Publication History
- Issue published online: 9 JUN 2011
- Article first published online: 2 AUG 2010
- Accepted manuscript online: 2 AUG 2010 12:00AM EST
- Manuscript Revised: 11 JUL 2010
- Manuscript Received: 24 DEC 2009
- Abstract
- Article
- References
- Cited By
Keywords:
- fluid sphere;
- viscosity ratio;
- interface contamination;
- mass transfer
Abstract
The unsteady mass transfer from a contaminated fluid sphere moving in an unbounded fluid is examined numerically for unsteady-state transfer. The effect of the interface contamination and the flow regime on the concentration profiles, inside and outside a fluid sphere, is investigated for different ranges of Reynolds number (0 < Re < 200) and Peclet number (0 < Pe < 105), viscosity ratio between the dispersed phase and the continuous phase (0 < κ < 10), and the stagnant-cap angle (0° < θcap < 180°). It was found that the stagnant-cap angle significantly influences the mass transfer from the sphere to a surrounding medium. For all Peclet and Reynolds numbers and κ, the contamination reduces the mass transfer flux. The average Sherwood number increases with an increase of stagnant-cap angle and reaches a maximum equal to the average one for a clean fluid sphere at low viscosity ratio and large Peclet numbers. A predictive equation for the Sherwood number is derived from these numerical results. © 2010 American Institute of Chemical Engineers AIChE J, 2011