Title: | Modelling gas-liquid flow and local mass transfer in stirred tanks |
Author(s): | Moilanen, Pasi |
Date: | 2009 |
Language: | en |
Pages: | Verkkokirja (4348 KB, 49 s.) |
Department: | Biotekniikan ja kemian tekniikan laitos |
ISBN: | 978-951-22-9789-4 978-951-22-9788-7 (printed) |
Subject: | Chemistry |
Keywords: | computational fluid dynamics, mixing, bioreactors |
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Abstract:This doctorial thesis offers a guideline for modelling gas-liquid flow in stirred tanks with computational fluid dynamics (CFD). Particularly the effect of varying physical properties and industrial operating conditions is highlighted. The most important thing in modelling mass transfer in stirred vessels is the accurate prediction of local bubble size. Population balances for bubbles are needed for accurate description of the local mass transfer rate. There are many pitfalls in gas-liquid modelling at the transitional turbulence regime, and they need to be recognised and dealt with at a reasonable computational cost. Details of the work are presented in the included publications, this thesis sums up the findings.
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Parts:[Publication 1]: Moilanen, P., Uusi-Kyyny, P., Pokki, J.-P., Pakkanen, M., Aittamaa, J., Vapor-liquid equilibrium for butane + methanol, + ethanol, + 2-propanol, + 2-butanol, and + 2-methyl-2-propanol (TBA) at 323 K. Journal of Chemical & Engineering Data (2008), 53 (1), 83-88.[Publication 2]: Laakkonen, M., Moilanen, P., Miettinen, T., Saari, K., Honkanen, M., Saarenrinne, P., Aittamaa, J., Local bubble size distributions in agitated vessel: Comparison of three experimental techniques. Chemical Engineering Research and Design (2005), 83 (A1), 50-58.[Publication 3]: Moilanen, P., Laakkonen, M., Aittamaa, J., CFD modelling of local bubble size distributions in agitated gas-liquid vessels – Verification against experiments. Proceedings of the 14th European Symposium on Computer Aided Process Engineering (ESCAPE 2004), Lisbon, Portugal (2004), 241-246.[Publication 4]: Moilanen, P., Laakkonen, M., Aittamaa, J., Modeling aerated fermenters with computational fluid dynamics. Industrial & Engineering Chemistry Research (2006), 45 (25), 8656-8663.[Publication 5]: Laakkonen, M., Moilanen, P., Alopaeus, V., Aittamaa, J., Dynamic modeling of local reaction conditions in an agitated aerobic fermenter. AIChE Journal (2006), 52 (5), 1673-1689.[Publication 6]: Laakkonen, M., Moilanen, P., Alopaeus, V., Aittamaa, J., Modelling local bubble size distributions in agitated vessels. Chemical Engineering Science (2007), 62 (3), 721-740.[Publication 7]: Laakkonen, M., Moilanen, P., Alopaeus, V., Aittamaa, J., Modelling local gas-liquid mass transfer in agitated vessels. Chemical Engineering Research and Design (2007), 85 (A5), 665-675.[Publication 8]: Moilanen, P., Laakkonen, M., Visuri, O., Aittamaa, J., Modeling local gas–liquid mass transfer in agitated viscous shear-thinning dispersions with CFD. Industrial & Engineering Chemistry Research (2007), 46 (22), 7289-7299.[Publication 9]: Moilanen, P., Laakkonen, M., Visuri, O., Alopaeus, V., Aittamaa, J., Modelling mass transfer in an aerated 0.2 m3 vessel agitated by Rushton, Phasejet and Combijet impellers. Chemical Engineering Journal (2008), 142 (1), 95-108.[Errata file]: Errata of publications 3 and 8 |
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