Gas Holdup in Bubble Columns at Elevated Pressure Via Computed Tomography


Gas Holdup in a Pressurized Bubble Column (Pressure from 0.1 to 0.7 MPa) Was Studied in a Laboratory Scale Vessel (Diameter 0.162m) with Air-Water System over a Range of Superficial Gas Velocities (0.02-0.18 M/s) using Non-Invasive Γ-Ray based Computed Tomography (CT). It Was Found that the Cross-Sectional Average Gas Holdup Increases with Pressure, as Well as with Superficial Gas Velocity. at All Operating Conditions, the Azimuthally Averaged Radial Gas Holdup Profiles Exhibit a Characteristic Shape with Greater Gas Holdup in the Column Center Than by the Walls. It is Also Observed that with an Increase in Pressure, the Transition to Churn-Turbulent Regime Characterized by the Change of the Radial Gas Holdup Profile from Relatively Flat to Almost Parabolic, is Delayed to Higher Superficial Gas Velocities. the Average Cross-Sectional Gas Holdup at Each Operating Condition Was Compared with Predictions of Existing Correlations and Large Discrepancies in Predictions (As High as 300%) Were Found. © 2001 Elsevier Science Ltd. All Rights Reserved.


Chemical and Biochemical Engineering


U.S. Department of Energy, Grant DE-FC-2s2-95 PC 95051

Keywords and Phrases

Bubble column; Computed tomography; Gas-liquid flow; High pressure; Superficial gas velocity

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Article - Journal

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© 2023 Elsevier, All rights reserved.

Publication Date

01 May 2001