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.