Abstract

Three Flow Patterns of Flooding, Loading and Complete Recirculation in a Gas-Liquid Stirred Rushton Tank Were Identified based on Experimental Observation. the Gas-Liquid System Was Composed of Air and Water. under Different Operating Conditions of Gas Flow Rate and Impeller Rotating Speed, the Distribution of Gas Holdup Near the Region of Impeller Was Measured using a Γ-CT Scan Method. Both Quantitative Digital Distribution Curves of Gas Holdup and their Qualitative Color CT Images Were Obtained. at the Region of Impeller, There Was a Convex Characteristic Peak of Gas Holdup Distribution Both in Radial and in Axial Directions, and with the Region Being Gradually Away from the Impeller, the Distribution of Gas Holdup Became Flatter. the Values of Gas Holdup in S33 Regime Were a Little Higher Than Those in L33 Regime. Higher Impeller Rotating Speed Had Some Effect on the Increasing of Gas Holdup at the Region of Higher Axial Height. the Experimental Measurement Results Were Basically Consistent with Those Previously Published by Bombač. the Hole Number and Diameter of Sparger Had Little Influence on the Distribution of Gas Holdup, While the Sparger's Installed Height Had Significant Influence on Them. When the Sparger Was Installed Close to the Bottom of Rushton Tank, a Comparatively Smoother Distribution of Gas Holdup above the Space of Impeller Could Be Obtained. the Research Results in This Paper Were Useful for Better Understanding of Gas Holdup Distribution Near the Region of Impeller of Rushton Tank and Could Also Provide Experimental Data for CFD Simulation. © 2012 Elsevier B.V.

Department(s)

Chemical and Biochemical Engineering

Comments

National Natural Science Foundation of China, Grant 20776121

Keywords and Phrases

γ-CT; Gas holdup distribution; Measurement; Near the region of impeller; Rushton tank

International Standard Serial Number (ISSN)

1385-8947

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 Elsevier, All rights reserved.

Publication Date

15 Apr 2012

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