Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 2
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

This paper is concerned with the rotational motion of the impeller and the thermal buoyancy within a mechanical mixer. The task was investigated numerically using the ANSYS-CFX simulator. The programmer is based on the finite volume method to solve the differential equations of fluid motion and heat transfer. The impeller has hot surfaces while the vessel has cold walls. The rotational movement of the impeller was controlled by the Reynolds number, while the intensity of the thermal buoyancy effect was controlled by the Richardson number. The equations were solved for a steady flow. After analyzing the results of this research, we were able to conclude that there is no effect of the values of Richardson number on the power number. Also, with the presence of the thermal buoyancy effect, the quality of the fluid mixing becomes more important. The increasing Richardson number increases the value of the Nusselt number of the impeller.
Go to article

Authors and Affiliations

Souad Hassouni
1
Houssem Laidoudi
2
Oluwole Daniel Makinde
3
Mohamed Bouzit
2
Boumediene Haddou
1

  1. University of Science and Technology of Oran Mohamed-Boudiaf, Faculty of Chemistry, BP 1505, El-Menaouer, Oran, 31000, Algeria
  2. University of Science and Technology of Oran Mohamed-Boudiaf, Laboratory of Sciences and Marine Engineering, Faculty of Mechanica lEngineering, BP 1505, El-Menaouer, Oran, 31000, Algeria
  3. Stellenbosch University, Faculty of Military Science, Private Bag X2, Saldanha 7395, South Africa
Download PDF Download RIS Download Bibtex

Abstract

We demonstrate in this study that a rotating magnetic field (RMF) and spinning magnetic particles using this kind of magnetic field give rise to a motion mechanism capable of triggering mixing effect in liquids. In this experimental work two mixing mechanisms were used, magnetohydrodynamics due to the Lorentz force and mixing due to magnetic particles under the action of RMF, acted upon by the Kelvin force. To evidence these mechanisms,we report mixing time measured during the neutralization process (weak acid-strong base) under the action of RMF with and without magnetic particles. The efficiency of the mixing process was enhanced by a maximum of 6.5% and 12.8% owing to the application of RMF and the synergistic effect of magnetic field and magnetic particles, respectively.
Go to article

Bibliography

Baldyga J., Bourne J.R., 1988. Calculation of micromixing in inhomogenous stirred tank reactors. Chem. Eng. Res. Des., 66(1), 33–38.

Baldyga J., Bourne J.R., 1992. Interactions between mixing on various scales in stirred tank reactors. Chem. Eng. Sci., 47, 1839–1848. DOI: 10.1016/0009-2509(92)80302-S.

Bałdyga J., Pohorecki R., 2013. Editorial. 14th European Conference on Mixing. Chem. Eng. Res. Des., 91(11), 2071–2072). DOI: 10.1016/j.cherd.2013.10.021.

Bao S.R., Zhang R.P., Rong Y., Zhi X.Q., Qiu L.M., 2019. Interferometric study of the heat and mass transfer during the mixing and evaporation of liquid oxygen and nitrogen under non-uniform magnetic field. Int. J. Heat Mass Transfer, 136, 10–19. DOI: 10.1016/j.ijheatmasstransfer.2019.02.044.

Boroun S., Larachi F., 2016. Role of magnetic nanoparticles in mixing, transport phenomena and reaction engineering – challenges and opportunities. Curr. Opin. Chem. Eng., 13, 91–99. DOI: 10.1016/j.coche.2016.08.011.

Boulware J.C., Ban H., Jensen, S., Wassom S., 2010. Influence of geometry on liquid oxygen magnetohydrodynamics. Exp. Therm Fluid Sci., 34, 1182–1193. DOI: 10.1016/j.expthermflusci.2010.04.007.

Chen X., Zhang L., 2019. A review on micromicers acuated with magnetic nanomaterials. Microchim Acta, 184, 3639–3649. DOI: 10.1007/s00604-017-2462-2.

Davidson P.A., 1999. Magnetohydrodynamics in materials processing. Annu. Rev. Fluid Mech., 31, 273–300. DOI: 10.1146/annurev.fluid.31.1.273.

Davidson P.A., 2001. An introduction to magnetohydrodynamics. Cambridge Uniwversity Press. DOI: 10.1017/CBO9780511626333.

Ergin F.G.,Watz B.B., Erglis K., Cebers A., 2015. Time-resolved velocity measurements in a magnetic micromixer. Exp. Therm Fluid Sci., 67. DOI: 10.1016/j.expthermflusci.2015.02.019.

Gao Y., 2013. Active mixing and catching using magnetic particles. Phd Thesis. Technische Universiteit Eindhoven. DOI: 10.6100/IR759475.

Gopalakrishnan S., Thess A., 2010. Chaotic mixing in electromagnetically controlled thermal convection of glass melt. Chem. Eng. Sci., 65, 5309–5319. DOI: 10.1016/j.ces.2010.07.008.

Hajiani P., Larachi F., 2014. Magnetic-field assisted mixing of liquids using magnetic nanoparticles. Chem. Eng. Process., 84, 31–37. DOI: 10.1016/j.cep.2014.03.012.

Hajiani P, Larachi F., 2013. Remotely excited magnetic nanoparticles and gas–liquid mass transfer in Taylor flow regime. Chem. Eng. Sci., 93, 257–265. DOI: 10.1016/j.ces.2013.01.052.

Hao Z., Zhu Q., Jiang Z., Li H., 2008. Fluidization characteristics of aerogel Co/Al2O3 catalyst in a magnetic fluidized bed and its application to CH4-CO2 reforming. Powder Technol., 183, 46–52. DOI: 10.1016/j.powtec.2007.11.015.

Harnby N., Edwards M.F., Nienow A.W., 1985. Mixing in the process industries. Butterworth-Heinemann. DOI: 10.1016/b978-0-7506-3760-2.x5020-3.

Hausmann R., Reichert C., Franzreb M., HöllW.H., 2004. Liquid-phase mass transfer of magnetic ion exchangers in magnetically influenced fluidized beds: II. AC fields. React. Funct. Polym., 60, 17–26. DOI: 10.1016/j.reactfunct polym.2004.02.007.

Hristov J., 2002. Magnetic field assisted fluidization – a unified aproach Part 1. Fundamentals and relevant hydrodynamics of gas-fluidized beds (batch solids mode). Rev. Chem. Eng., 18, 295–512. DOI: 10.1515/REVCE.2002.18.4-5.295.

Hristov J., 2007. Magnetic field assisted fluidization-Dimensional analysis addressing the physical basis. China Particuology, 5, 103–110. DOI: 10.1016/j.cpart.2007.03.002.

Hristov J., 2010. Magnetic field assisted fluidization – A unified approach. Part 8. Mass transfer: Magnetically assisted bioprocesses. Rev. Chem. Eng., 26, 55–128. DOI: 10.1515/REVCE.2010.006.

Hristov J.Y., 1998. Fluidization of ferromagnetic particles in a magnetic field Part 2: Field effects on preliminarily gas fluidized bed. Powder Technol., 97, 35–44. DOI: 10.1016/S0032-5910(97)03392-5.

Krakov M.S., 2020. Mixing of miscible magnetic and non-magnetic fluids with a rotating magnetic field. J. Magn. Magn. Mater., 498. DOI: 10.1016/j.jmmm.2019.166186.

Lange A., 2002.Kelvin force in a layer of magnetic fluid. J. Magn. Magn. Mater., 241, 327–329. DOI: 10.1016/S0304 -8853(01)01368-3.

Lu X., Li H., 2000. Fluidization of CaCO3 and Fe2O3 particle mixtures in a transverse rotating magnetic field. Powder Technol., 107, 66–78. DOI: 10.1016/S0032-5910(99)00092-3.

Moffatt H.K., 1965. On fluid flow induced by a rotating magnetic field. J. Fluid Mech., 22, 521–528. DOI: 10.1017/S0022112065000940.

Moffatt H.K., 1990. On the behaviour of a suspension of conducting particles subjected to a time-periodic magnetic field. J. Fluid Mech., 218, 509–529. DOI: 10.1017/S0022112090001094.

Moffatt H.K., 1991. Electromagnetic stirring. Phys. Fluids A, 3, 1336–1343. DOI: 10.1063/1.858062.

Molokov S., Moreau R., Moffat H.K., 2007. Magnetohydrodynamics. Historical evolution and trends. Springer Science+Business Media B.V. DOI: 10.1007/978-1-4020-4833-3.

Nouri D., Zabihi-Hesari A., Passandideh-Fard M., 2017. Rapid mixing in micromixers using magnetic field. Sens. Actuators, A, 255, 79–86. DOI: 10.1016/j.sna.2017.01.005.

Olivier G., Pouya H., Fadçal L., 2014. Magnetically induced agitation in liquid–liquid–magnetic nanoparticle emulsions: Potential for process intensification. AIChE J., 60, 1176–1181. DOI: 10.1002/AIC.14331.

Penchev I.P., Hristov J.Y., 1990. Fluidization of beds of ferromagnetic particles in a transverse magnetic field. Powder Technol., 62, 1–11. DOI: 10.1016/0032-5910(90)80016-R.

Poulsen B.R., Iversen J.J.L., 1997. Mixing determinations in reactor vessels using linear buffers. Chem. Eng. Sci., 52, 979–984. DOI: 10.1016/S0009-2509(96)00466-6.
Go to article

Authors and Affiliations

Rafał Rakoczy
1
ORCID: ORCID
Marian Kordas
1
ORCID: ORCID
Agata Markowska-Szczupak
1
ORCID: ORCID
Maciej Konopacki
1
ORCID: ORCID
Adrian Augustyniak
1
ORCID: ORCID
Joanna Jabłońska
1
Oliwia Paszkiewicz
1
ORCID: ORCID
Kamila Dubrowska
1
Grzegorz Story
1
Anna Story
1
Katarzyna Ziętarska
1
Dawid Sołoducha
1
Tomasz Borowski
1
Marta Roszak
2
Bartłomiej Grygorcewicz
2
ORCID: ORCID
Barbara Dołęgowska
2
ORCID: ORCID

  1. West Pomeranian University of Technology in Szczecin, Faculty of Chemical Technology and Engineering, Department of Chemical and Process Engineering, al. Piastów 42,71-065 Szczecin, Poland
  2. Pomeranian Medical University in Szczecin, Chair of Microbiology, Immunology and Laboratory Medicine, Department of Laboratory Medicine, al. Powstańców Wielkopolskich 72, 70-111 Szczecin, Poland

This page uses 'cookies'. Learn more