Local gas hydrodynamics in an external-loop airlift reactor: newtonian and non-newtonian fluids |
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Authors: | C Bentifraouine C Xuereb J P Riba |
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Institution: | (1) Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada;(2) Department of Bioengineering, Dalian University of Technology, Dalian, 116012, China; |
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Abstract: | Measurements of local gas phase characteristics are obtained in an external-loop airlift reactor filled with newtonian or viscous non-newtonian liquids. A double-optical fiber probe technique is used. It allows the determination of the axial and radial profiles of gas hold-up, bubbling frequency, bubble size and velocity. In the case of air-water system, the results show a strong effect of radial liquid velocity variation on the gas flow characteristics at the bottom of the riser. In the case of highly viscous non-newtonian solution, the gas flow is strongly affected by the gas distribution just above the gas sparger. This study also points out the bubble coalescence and the break-up phenomena in different liquids and levels in the reactor. Furthermore, the local measurements of bubble size and velocity allows to gain more detailed information on the dynamics of the bubble-flow and shows a tendency of large bubbles to circulate in the column center. |
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