Flow rate dependent kinetics of urease immobilized onto diverse matrices |
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Authors: | S George M Chellapandian B Sivasankar P V Sundaram |
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Institution: | (1) Department of Chemical and Biochemical Engineering, University College London, Torrington Place, WCIE 7JE London, UK |
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Abstract: | Gas holdup and liquid circulation velocity meassurements were made for a range of liquid viscosities in a 22 l external loop airlift column and 250 l pilot-scale concentric cylinder airlift bioreactor. The results showed that for a fixed superficial gas velocity, liquid circulation velocity decreased monotonically with increasing liquid viscosity. The gas holdup for a fixed gas flow rate showed an initial increase with liquid viscosity followed by a decrease when liquid viscosity increased beyond a critical value. These observations could not be described satisfactorily using the available models of gas holdup and liquid circulation.List of Symbols U
sg
m/s
Superficial gas velocity
- U
sl
m/s
Superficial liquid velocity in the riser
Greek Letters
Pas
Liquid viscosity
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g
Gas holdup in the riser |
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Keywords: | |
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