X-ray computed tomography of a gas-sparged stirred-tank reactor |
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Authors: | Jason J. Ford Terrence C. Jensen |
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Affiliation: | a Department of Mechanical Engineering, Iowa State University, Ames, IA 50011-2161, USA b Center for Nondestructive Evaluation, Iowa State University, Ames, IA 50011-2161, USA |
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Abstract: | X-ray computed tomography (CT) is used to explore the differences in gas dispersion in a stirred-tank reactor (STR) for different operating conditions by varying the impeller speed and gas flow rate. X-ray imaging has been carried out in a 0.21 m ID acrylic STR equipped with a nylon Rushton-type impeller. From the CT images, major differences in local gas holdup are observed for different operating conditions. Completely dispersed conditions have a relatively uniform holdup profile while flooded conditions show a high gas holdup near the impeller shaft. The high resolution of the X-ray system allowed fine details such as recirculation regions behind the baffles to be visualized. |
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Keywords: | Hydrodynamics Multiphase flow Stirred-tank reactor Tomography Visualization Voidage |
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