Abstract
This study reports the research results on a mixing process using a stirred tank mixer under the action of a rotating magnetic field (RMF). Dimensionless correlations are proposed to predict the power consumption and mixing time for the mixing systems analysed. The results suggest that the mixing behaviour of the experimental set-ups tested may be assessed using the dimensionless mixing energy as the product of the power input and mixing time. In addition, an innovative strategy is proposed on the basis of the synergistic effect of the rotational Rushton turbine and the RMF generator. The values of the dimensionless energy thus obtained were used to compare the mixing process performed by the mixing devices tested. It is shown that the mixing process under the RMF action has significantly higher values of energy consumption than the conventional Rushton turbine. The total energy consumption for the mixing process performed by the RMF mixer may be reduced by concomitant use of a rotational agitator.
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References
Alvarez, M. M., Arratia, P. E., & Muzzio, F. J. (2002). Laminar mixing in eccentric stirred tank system. The Canadian Journal of Chemical Engineering, 80, 546–557. DOI: 10.1002/cjce.5450800418.
Arjunwadkar, S. J., Sarvanan, K., Kulkarni, P. R., & Pandit, A. B. (1998). Gas—liquid mass transfer in dual impeller bioreactor. Biochemical Engineering Journal, 1, 99–106. DOI: 10.1016/s1385–8947(97)00083–1.
Delaplace, G., Leuliet, J. C., & Relandeau, V. (2000). Circulation and mixing times for helical ribbon impellers. Review and experiments. Experiments in Fluids, 28, 170–182. DOI: 10.1007/s003480050022.
Egedy, A., Varga, T., & Chovan, T. (2012). CFD modelling and video analysis based model validation for a stirred reactor. In I. D. L. Bogle, & M. Fairweather (Eds.), Proceedings of the 22nd European Symposium on Computer Aided Process Engineering, 17–20 June, 2012, London (pp. 1123–1127). Amsterdam, The Netherlands: Elsevier. DOI: 10.1016/b978-0–444–59520–1.50083-x.
Gabelle, J. C., Augier, F., Carvalho, A., Rousset, R., & Morchain, J. (2011). Effect of tank size on ka and mixing time in aerated stirred reactors with non-Newtonian fluids. The Canadian Journal of Chemical Engineering, 89, 1139–1153. DOI: 10.1002/cjce.20571.
Hristov, J. (2010). Magnetic field assisted fluidization — a unified approach. Part 8. Mass transfer: magnetically assisted bioprocesses. Reviews in Chemical Engineering, 26, 55–128. DOI: 10.1515/revce.2010.006.
Jafari, M., & Soltan Mohammadzadeh, J. S. (2005). Mixing time, homogenization energy and residence time distribution in a gas-induced contactor. Chemical Engineering Research and Design, 83, 452–459. DOI: 10.1205/cherd.04207.
Jaworski, Z., & Nienow, A. W. (1994). LDA measurements of flow fields with hydrofoil impellers in fluids with different rheological properties. In Proceedings of the 8th European Conference on Mixing, 21–23 September, 1994, University of Cambridge, UK (Institution of Chemical Engineers Symposium Series, Vol. 136, pp. 105–112).
Karcz, J., Cudak, M., & Szoplik, J. (2005). Stirring of a liquid in a stirred tank with eccentrically located impeller. Chemical Engineering Science, 60, 2369–2380. DOI: 10.1016/j.ces.2004.11.018.
Kuzmanic, N., & Ljubicic, B. (2001). Suspension of floating solids with up-pumping pitched blade impellers; mixing time and power characteristics. Chemical Engineering Journal, 84, 325–333. DOI: 10.1016/s1385–8947(00)00382-x.
Kuzmanic, N., Zanetic, R., & Akrap, M. (2008). Impact of floating suspended solids on the homogenisation of the liquid phase in dual-impeller agitated vessel. Chemical Engineering and Processing: Process Intensification, 47, 663–669. DOI: 10.1016/j.cep.2006.12.010.
Liu, Z. H., Zheng, X. P., Liu, D., Wang, Y. D., & Tao, C. Y. (2014). Enhancement of liquid-liquid mixing in a mixer- settler by a double rigid-flexible combination impeller. Chemical Engineering and Processing: Process Intensification, 86, 69–77. DOI: 10.1016/j.cep.2014.10.007.
Masiuk, S. (2014). Mixing time for a reciprocating plate agitator with flapping blades. Chemical Engineering Journal, 79, 23–30. DOI: 10.1016/s1385–8947(00)00141–8.
Masiuk, S., Rakoczy, R., & Kordas, M. (2008). Comparison density of maximal energy for mixing process using the same agitator in rotational and reciprocating movements. Chemical Engineering and Processing: Process Intensification, 47, 1252–1260. DOI: 10.1016/j.cep.2007.04.004.
Metzner, A. B., & Otto, R. E. (1957). Agitation of non-Newtonian fluids. AIChE Journal, 3, 3–10. DOI: 10.1002/aic.690030103.
Moffatt, H. K. (1965). On fluid flow induced by a rotating magnetic field. Journal of Fluid Mechanics, 22, 521–528. DOI: 10.1017/s0022112065000940.
Nienow, A. W., & Elson, T. P. (1988). Aspects of mixing in rheologically complex fluids. Chemical Engineering Research and Design, 66, 5–15.
Nishikawa, M., Ashiwake, K., Hashimoto, N., & Nagata, S. (1979). Agitation power and mixing time in off-centering mixing. International Chemical Engineering, 19, 153–160.
Paul, E. L., Atiemo-Obeng, V. A., & Kresta, S. M. (2004). Handbook of industrial mixing: Science and practice. Hoboken, NJ, USA: Wiley-Interscience.
Polish Committee for Standardization (1963). Polish standard: Devices and intrinsically safe electrical circuits in coal mines — Rules of construction and test methods. PN-E-08107:1963. Warsaw, Poland. (in Polish)
Rakoczy, R. (2010). Enhancement of solid dissolution process under the influence of rotating magnetic field. Chemical Engineering and Processing: Process Intensification, 49, 42–50. DOI: 10.1016/j.cep.2009.11.004.
Rakoczy, R., & Masiuk, S. (2010). Influence of transverse rotating magnetic field on enhancement of solid dissolution process. AIChE Journal, 56, 1416–1433. DOI: 10.1002/aic.12097.
Rakoczy, R., & Masiuk, S. (2011). Studies of a mixing process induced by a transverse rotating magnetic field. Chemical Engineering Science, 66, 2298–2308. DOI: 10.1016/j.ces. 2011.02.021.
Rakoczy, R. (2013). Mixing energy investigations in a liquid vessel that is mixed by using a rotating magnetic field. Chemical and Process Engineering: Process Intensification, 66, 1–11. DOI: 10.1016/j.cep.2013.01.012.
Woziwodzki, SZ., Broniarz-Press, L., & Ochowiak, M. (2010). Effect of eccentricity on transitional mixing in vessel equipped with turbine impellers. Chemical Engineering Research and Design, 88, 1607–1614. DOI: 10.1016/j.cherd.2010.04.007.
Xie, M. H., Xia, J. Y., Zhou, Z., Zhou, G. Z., Chu, J., Zhuang, Y. P., Zhang, S. L., & Noorman, H. (2014). Power consumption, local and average volumetric mass transfer coefficient in multiple-impeller stirred bioreactors for xanthan gum solutions. Chemical Engineering Science, 106, 144–156. DOI: 10.1016/j.ces.2013.10.032.
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Story, G., Kordas, M. & Rakoczy, R. Correlations for mixing energy in processes using Rushton turbine mixer. Chem. Pap. 70, 747–756 (2016). https://doi.org/10.1515/chempap-2016-0008
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DOI: https://doi.org/10.1515/chempap-2016-0008