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Processes 2014, 2(1), 200-215; doi:10.3390/pr2010200

Absorption and Chemisorption of Small Levitated Single Bubbles in Aqueous Solutions

TU Dortmund University, BCI, Equipment Design, Emil-Figge-Straße 68, D-44227 Dortmund, Germany
Author to whom correspondence should be addressed.
Received: 30 November 2013 / Revised: 28 January 2014 / Accepted: 28 January 2014 / Published: 24 February 2014
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The absorption and chemisorption of small bubbles with N2 or CO2 were investigated experimentally in aqueous and alkaline solutions. Different bubble sizes were studied ranging from 0.1 to 2.5 mm in alkaline concentrations of 0.1 mM to 1 M NaOH. The experiments were conducted in a device consisting of a converging microchannel with a down flowing liquid. Levitation positions of single bubbles were optically characterized. A correlation was developed for the drag force coefficient, CD, including wall effects based on the force equilibrium. A linear decrease of bubble diameters was identified with and without chemical reaction, which is referred to as a rigid bubble surface area. Measured Sherwood numbers agree well with the literature values for the investigated Reynolds number range. View Full-Text
Keywords: mass transfer; levitation; bubble; drag force coefficient; Sherwood number mass transfer; levitation; bubble; drag force coefficient; Sherwood number

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Tollkötter, A.; Kockmann, N. Absorption and Chemisorption of Small Levitated Single Bubbles in Aqueous Solutions. Processes 2014, 2, 200-215.

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