426266 Quantification of Gas-Phase Backmixing in Bubble Column Using Optical Probe Probabilistic Model

Wednesday, November 11, 2015: 1:30 PM
355F (Salt Palace Convention Center)
Boung Wook Lee, Energy, Environmental, and Chemical Engineering Department, Washington University in St. Louis, St. Louis, MO and Milorad P. Dudukovic, Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO

This work presents application of optical probe probabilistic model1  in bubble column for quantification of gas phase backmixing at the bottom, the middle, and the upper column sections. Optical probe measurements are collected from the tapered end optical probe2 at various radial and axial positions and processed using the probabilistic model. Based on the fact that optical probe measurements are reliable when the bubble impaction angles are within 180 degrees, directional contributions to the overall local gas phase dispersions (holdups and bubble counts) are quantified. These results demonstrate optical probe technique’s unique ability to allow direct gas phase backmixing measurement.


1.         Lee BW, Dudukovic MP. A probabilistic model for correcting the directional sensitivity of optical probe measurements. AIChE Journal.

2.         Lee BW, Dudukovic MP. Determination of flow regime and gas holdup in gas–liquid stirred tanks. Chemical Engineering Science. 2014;109(0):264-275.

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See more of this Session: Multiphase Reaction Engineering II
See more of this Group/Topical: Catalysis and Reaction Engineering Division