LIQUID CIRCULATION PATTERNS AND THEIR EFFECT ON GAS HOLD-UP AND AXIAL MIXING IN BUBBLE COLUMNS

Abstract Liquid velocity profiles in a bubble column were measured with the aid of a hot-film anemometer. Two different types of profiles were detected that were characterized by the formation of a boundary layer at the column wall. Under slow flow conditions, the boundary layer is large and controls the liquid velocity profile, but in turbulent flow the boundary layer is very small and has no significant effect on the velocity profile. Microscopic and macroscopic balances were used to predict both the liquid velocity profile and the average liquid velocity. The effect of the liquid velocity profile and average velocity on axial dispersion and gas-hold-up are analyzed and design procedures are recommended.

[1]  H. Kikukawa,et al.  DIMENSIONLESS CORRELATION OF LIQUID-PHASE DISPERSION COEFFICIENT IN BUBBLE COLUMNS , 1975 .

[2]  I. Lehrer.  Gas Hold-Up and Interfacial Area in Sparged Vessels , 1971 .

[3]  W. Deckwer,et al.  Mixing and mass transfer in tall bubble columns , 1974 .

[4]  S. Asai,et al.  Gas hold-up in bubble columns , 1980 .

[5]  W. Weiss,et al.  Flüssigkeitsdurchmischung in engen Blasensäulen , 1957 .

[6]  G. A. Hughmark,et al.  Holdup and Mass Transfer in Bubble Columns , 1967 .

[7]  Reiner Badura,et al.  Durchmischung in Blasensäulen , 1974 .

[8]  H. E. Hoelscher,et al.  Bubble swarm characteristics in bubble columns , 1976 .

[9]  W. Deckwer,et al.  Bubble size distribution and interfacial areas of electrolyte solutions in bubble columns , 1975 .

[10]  Yatish T. Shah,et al.  Design parameters estimations for bubble column reactors , 1982 .

[11]  K. D. Mangartz,et al.  Interpretation of mass transfer measurements in bubble columns considering dispersion of both phases , 1981 .

[12]  J. Bridgwater,et al.  Chain bubbling in viscous liquids , 1969 .

[13]  M. Baird,et al.  Axial dispersion in large unbaffled columns , 1975 .

[14]  Korekazu Ueyama,et al.  Properties of recirculating turbulent two phase flow in gas bubble columns , 1979 .

[15]  Y. Shah,et al.  Axial dispersion coefficients in bubble columns , 1976 .

[16]  N. Tavare,et al.  Growth rate measurements in DTB crystallizer , 1975 .

[17]  D. Cova.  Axial Mixing in the Liquid Phase in Gas-Sparged Columns , 1974 .