Author： Baawain Mahad S. El-Din Mohamed Gamal Clarke Katie Smith Daniel W.
Publisher： Taylor & Francis Ltd
ISSN： 0191-9512
Source： Ozone: Science and Engineering, Vol.29, Iss.4, 2007-07, pp. : 245-259
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Abstract
A transient back flow cell model was used to model the hydrodynamic behaviour of an impinging-jet ozone bubble column. A steady-state back flow cell model was developed to analyze the dissolved ozone concentration profiles measured in the bubble column. The column-average overall mass transfer coefficient, kLa (s-1), was found to be dependent on the superficial gas and liquid velocities, uG (m.s-1) and uL (m.s-1), respectively, as follows: kLa = 55.58 · uG1.26· uL0.08. The specific interfacial area, a (m-1), was determined as a = 3.61 × 103 · uG0.902 · uL -0.038 by measuring the gas hold-up (εG = 4.67 · uG1.11 · uL -0.05) and Sauter mean diameter, dS (mm), of the bubbles (dS = 7.78 · uG0.207 · uL - 0.008). The local mass transfer coefficient, kL (m.s-1), was then determined to be: kL = 15.40 · uG0.354 · uL0.118.
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