Aggregation study of Brownian nanoparticles in convective phenomena

dc.contributor.authorMahdavi, Mostafa
dc.contributor.authorSharifpur, Mohsen
dc.contributor.authorAhmadi, Mohammad Hossein
dc.contributor.authorMeyer, Josua P.
dc.contributor.emailmohsen.sharifpur@up.ac.zaen_ZA
dc.date.accessioned2020-06-03T14:13:54Z
dc.date.available2020-06-03T14:13:54Z
dc.date.issued2019-01
dc.description.abstractThe explanation of abnormal enhancement of transported energy in colloidal nanoparticles in a liquid has sparked much interest in recent years. The complexity comes from the inter-particle phenomenon and cluster formation. The process of nanoparticle aggregation, which is caused by convective phenomena and particle-to-particle interaction energy in a flow, is investigated in this research. Therefore, the probability of collision and cohesion among clusters is modelled, as stated in this research. ANSYS-Fluent 17 CFD tools are employed to implement a new method of nanoparticle aggregation, new essential forces, new heat law and cluster drag coefficient. The importance of the interaction forces is compared to drag force, and essential forces are considered in coupling between nanoparticles and fluid flow. An important parameter is defined for the surface energy density regarding the attractive energy between the double layer and surrounding fluid to capture the cohesion of particles. Particles’ random migration is also presented through their angular and radial displacement. The analyses for interactions show the significance of Brownian motion in both particles’ migration and coupling effects in the fluid. However, nanoparticles are pushed away from walls due to repulsive forces, and Brownian motion is found to be effective mainly on angular displacement around the tube centreline. The attractive energy is found to be dominant when two clusters are at an equal distance. Hence, the cluster formation in convective regions should be taken into account for modelling purposes. A higher concentrated region also occurs midway between the centreline and the heated wall.en_ZA
dc.description.departmentMechanical and Aeronautical Engineeringen_ZA
dc.description.librarianhj2020en_ZA
dc.description.urihttp://link.springer.com/journal/10973en_ZA
dc.identifier.citationMahdavi, M., Sharifpur, M., Ahmadi, M.H. et al. Aggregation study of Brownian nanoparticles in convective phenomena. Journal of Thermal Analysis and Calorimetry 135, 111–121 (2019). https://doi.org/10.1007/s10973-018-7283-y.en_ZA
dc.identifier.issn1388-6150 (print)
dc.identifier.issn1572-8943 (online)
dc.identifier.other10.1007/s10973-018-7283-y
dc.identifier.urihttp://hdl.handle.net/2263/74859
dc.language.isoenen_ZA
dc.publisherSpringeren_ZA
dc.rights© Akadémiai Kiadó, Budapest, Hungary 2018. The original publication is available at : http://link.springer.comjournal/10973.en_ZA
dc.subjectNanoparticlesen_ZA
dc.subjectAggregationen_ZA
dc.subjectBrownian motionen_ZA
dc.subjectCohesionen_ZA
dc.subjectSurface energyen_ZA
dc.subjectCFDen_ZA
dc.subject.otherEngineering, built environment and information technology articles SDG-06
dc.subject.otherSDG-06: Clean water and sanitation
dc.subject.otherEngineering, built environment and information technology articles SDG-09
dc.subject.otherSDG-09: Industry, innovation and infrastructure
dc.subject.otherEngineering, built environment and information technology articles SDG-12
dc.subject.otherSDG-12: Responsible consumption and production
dc.subject.otherEngineering, built environment and information technology articles SDG-13
dc.subject.otherSDG-13: Climate action
dc.titleAggregation study of Brownian nanoparticles in convective phenomenaen_ZA
dc.typePostprint Articleen_ZA

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