II. Recirculation flow induced by a bubble stream rising in a viscous liquid |
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Authors: | P Snabre F Magnifotcham |
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Institution: | (1) Institut de Science et de génie des matériaux et procédés (UPR 8521), BP 5, 66125 Font-Romeu, France, FR |
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Abstract: | The recirculation flow induced by the rising motion of a bubble stream in a viscous fluid within an open-top rectangular enclosure
is studied. The three-dimensional volume averaged conservation equations are solved by a control-volume method using a hybrid
finite differencing scheme to describe the liquid phase hydrodynamics. The momentum exhange between the bubbles and the liquid
phase is modeled with a source term equals to the volumetric buoyancy force acting on the gas in the bubble stream. The volumetric
buoyancy force accounts for in line interactions between bubbles through the average gas volume fraction in the gas liquid
column which depends on the size and the rising velocity of bubbles. The fluid flow within an open-top rectangular enclosure
is further investigated by particle image velocimetry for a bubble stream rising in a water-glycerol solution. The measured
fluid velocities in a vertical plane are compared with the predictions of the numerical model over a wide range of fluid viscosity
(43 mPa s-800 mPa s) and gas flow rates. Finally, the recirculation flows resulting from the interaction of two neighbouring
vertical bubble streams are studied.
Received: 23 July 1997 / Revised: 19 December 1997 / Accepted: 11 May 1998 |
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Keywords: | PACS 47 55 -t Nonhomogeneous flows - 47 55 Dz Drops and bubbles - 47 80 +v Instrumentation for fluid dynamics |
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