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Numerical simulation of reactive species transfer at a spherical gas bubble

Karpowski, Tim Jeremy Patrick :
Numerical simulation of reactive species transfer at a spherical gas bubble.
Technische Universität, Darmstadt
[Bachelor Thesis], (2017)

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Item Type: Bachelor Thesis
Title: Numerical simulation of reactive species transfer at a spherical gas bubble
Language: English
Abstract:

The reactive mass transfer at spherical gas bubbles in a stationary incompressible fluid is analysed numerically. Only the continuous phase is simulated. The influence of the gaseous phase on mass transfer is neglected. The concentration of the transfer species, which diffuses into the bulk, is assumed to be constant in space and time inside the bubble. Four different reaction types, namely decay, single, parallel consecutive and parallel competitive reaction are evaluated all being irreversible and of first order for the transfer species A. The main parameters for mass transfer are accessed and a parameter study is carried out to quantify their influence. The parameters studied are Re ∈ [2; 100] , Pe ∈ [10E4; 10E6], Da ∈ [0, 10] and different ratios of concentrations and diffusivities, both in the range of [0.1; 10]. The data is then compared with known correlations for non-reactive mass transfer and the enhancement factor. Afterwards regression algorithms from the field of machine learning are implemented and trained on the data sets. The performance of the algorithms is accessed. A trained algorithm is used to predict the mass transfer and the resulting volume change at a rising CO_2 bubble in Water. The effect of conjugated mass transfer is analysed and the results are compared to experimental data.

Place of Publication: Darmstadt
Divisions: 04 Department of Mathematics > Mathematical Modelling and Analysis
Date Deposited: 23 Nov 2017 13:56
Last Modified: 23 Nov 2017 13:56
URN: urn:nbn:de:tuda-tuprints-69402
Referees: Bothe, Prof. Dr. Dieter and Stephan, Prof. Dr Peter
Refereed: 19 October 2017
URI: http://tuprints.ulb.tu-darmstadt.de/id/eprint/6940
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