Gas hold-up and bubble diameters in a gassed oscillatory ba'ed column
نویسندگان
چکیده
In this paper attempts are made to address how bubble behaviour in a batch oscillatory ba'ed column (OBC) contributes to the overall measured enhancement in mass transfer. A CCD camera is used to measure the bubble size distribution and the gas hold-up in the OBC. The experimental results of Sauter mean diameter and gas hold-up are correlated as a function of the power dissipation and super5cial gas velocity, in order to allow for comparisons with published correlations for the mass transfer coe6cient. In general, an increase in the oscillatory velocity causes an increase in the hold-up and a decrease in the Sauter mean diameter. Furthermore, we are able to show that the changes in the gas hold-up contribute more than the mean bubble size to the control of the mass transfer coe6cient. ? 2001 Elsevier Science Ltd. All rights reserved.
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