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• W2809979719 abstract "Development of low-cost, ambient pressure, gas-liquid contactors with fast mass transfer (high kLa) and low energy consumption are key for industrial chemical processing technologies. A recently published reactor design comprised an array of downward-pointing micro-jets at the top of the vessel to create a downflow of microbubbles. Performance showed high kLa and low power usage. However, the most stable hydrodynamic mode under a jet array includes a large and persistent eddy, likely similar to the “Coanda effect” reported much earlier. Here we test swirling hydrodynamics to prevent momentum positive feedback that hypothetically creates this backmixing. Particle imaging velocimetry (PIV), salt-pulse tracking residence time distribution (RTD), and kLa data are collected from the swirl and non-swirl case. The data confirm the hypothesis about the hydrodynamic origin of the eddy, and suggests that it must be considered during reactor design. The data further show that swirl shifts the overall reactor hydrodynamics closer to plug flow, creates more tanks in series, more homogenous turbulence, greater kLa, and greater kLa per power usage (an increase by 40%). A physical understanding is given by measurements of residence time distribution that create more efficient contact of gas and liquid phases." @default.
• W2809979719 created "2018-07-10" @default.
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• W2809979719 date "2018-08-01" @default.
• W2809979719 modified "2023-09-27" @default.
• W2809979719 title "Hydrodynamics under the jet-array of a downflow microbubble column: Performance intensification" @default.
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• W2809979719 doi "https://doi.org/10.1016/j.cep.2018.06.023" @default.
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