Abstract
Bubble columns are commonly used in chemical, petrochemical, biochemical, and environmental engineering applications to conduct two-phase/three-phase operations. There are many techniques such as Electrical tomography (ERT, ECT and EIT), PIV, X-Ray tomography and the gamma ray tomography offered to assess the characteristics of the internal flow dynamics non-intrusively in the bubble column. A greater speed double plane electrical resistance tomography (ERT) system and high speed video camera were applied to a bubble column for the estimation of time averaged gas hold-up and bubble size distribution (BSD) respectively. The experiments are carried out in a 4 inch inner diameter bubble column. For numerous gas flow rates and spargers, the data are summarized in terms of gas holdup and bubble size distribution. The tomographic images were created through modified sensitivity back projection algorithm and compared with other improved reconstruction algorithms. The gas-holdup increases as the air flow rate rises, according to ERT. A high-speed video camera was used to obtain bubble size distribution from which the average gas holdup could be calculated in order to evaluate the reliability of ERT measurements.
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