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The effect of Stefan flow on Nusselt number and drag coefficient of spherical particles in non-isothermal gas flow
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.ORCID-id: 0000-0001-7319-1248
Department of Energy and Process Engineering, Norwegian University of Science and Technology, Kolbjørn Hejes vei 1 B, 7491 Trondheim, Norway. Department of Thermal Energy, SINTEF Energy Research, Kolbjørn Hejes vei 1 A, 7491 Trondheim, Norway.
Department of Chemical Engineering, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.ORCID-id: 0000-0002-0308-3871
Vise andre og tillknytning
2021 (engelsk)Inngår i: International Journal of Multiphase Flow, ISSN 0301-9322, E-ISSN 1879-3533, Vol. 140, artikkel-id 103650Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A Stefan flow can be generated during a phase change or reactions of a particle immersed in a fluid. This study investigates the effect of Stefan flow on the exchange of momentum (drag coefficient (CD)) and heat transfer (Nusselt number (Nu)) between the particle and bulk-fluid. Fully resolved simulations were carried out for a flow near a spherical particle immersed in a uniform bulk flow. The immersed boundary method is used for implementing fluid-solid interactions and the particle is considered as a static boundary with fixed boundary conditions. In a non-isothermal flow, the changes in thermophysical properties at the boundary layer played a role in the variation of CD and Nu by a Stefan flow further. The previously developed model for the drag coefficient of a spherical particle in a uniform isothermal flow was modified for a uniform non-isothermal flow. The model is developed based on physical interpretation. A new model is developed for the Nusselt number for a spherical particle with a uniform Stefan flow combining available models in literature. The models are validated for Stefan Reynolds number −8⩽Resf,p⩽25 and particle Reynolds number of 2⩽Ref⩽30 in gas flow (i.e. Pr≈0.7).

sted, utgiver, år, opplag, sider
Elsevier, 2021. Vol. 140, artikkel-id 103650
Emneord [en]
Drag coefficient, Nusselt number, Stefan flow, Boundary layer, multiphase reactive flow
HSV kategori
Forskningsprogram
Energiteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-83715DOI: 10.1016/j.ijmultiphaseflow.2021.103650ISI: 000681446200009Scopus ID: 2-s2.0-85103977758OAI: oai:DiVA.org:ltu-83715DiVA, id: diva2:1544721
Forskningsfinansiär
Swedish Research Council, 2016-07213Luleå University of TechnologyThe Research Council of Norway, 267916EU, Horizon 2020, 764697
Merknad

Validerad;2021;Nivå 2;2021-04-16 (alebob)

Tilgjengelig fra: 2021-04-16 Laget: 2021-04-16 Sist oppdatert: 2023-09-06bibliografisk kontrollert

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Jayawickrama, Thamali RajikaChishty, Muhammad AqibUmeki, Kentaro

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