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The effects of Stefan flow on the flow surrounding two closely spaced particles
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0001-7319-1248
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-0308-3871
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. Department of Thermal Energy, SINTEF Energy Research, Kolbjørn Hejes vei 1 A, 7491 Trondheim, Norway.ORCID iD: 0000-0002-9184-8722
Department of Chemical Engineering, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
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2023 (English)In: International Journal of Multiphase Flow, ISSN 0301-9322, E-ISSN 1879-3533, Vol. 166, article id 104499Article in journal (Refereed) Published
Abstract [en]

The aim of the work was to study the effects of neighboring particles with uniform Stefan flow in particle–fluid flows. Particle-resolved numerical simulations were carried out for particles emitting a uniform Stefan flow into the bulk fluid. The bulk fluid was uniform and isothermal. The Stefan flow volume emitted from the two particles is equal, such that it represents idealized conditions of reacting particles. Particles were located in tandem arrangement and particle distances were varied between 1.1 and 10 particle diameters (). Three particle Reynolds numbers were considered during the simulations ( and 14), which is similar to our previous studies. Three Stefan flow velocities were also considered during simulations to represent inward, outward, and no Stefan flow. The drag coefficient of the particles without Stefan flow showed that the results fit with previous studies on neighbor particle effects. When the particle distance is greater than 2.5 diameters (), the effects of Stefan flow and neighboring particles are independent of each other. I.e. an outward Stefan flow decreases the drag coefficient () while an inward Stefan flow increases it and the upstream particle experience a higher  than the downstream particle. When , the effect of Stefan flow is dominant, such that equal and opposite pressure forces act on the particles, resulting in a repelling force between the two neighboring particles. The pressure force showed a large increase compared to the viscous force at these distances. The effect of Stefan flow is weakened at higher Reynolds numbers. A model was developed for the calculation of the drag coefficient. The model, which reproduce the results from the numerical simulations presented above, is a product of independent models that describe the effects of both neighboring particles and two distinguished effects of the Stefan flow.

Place, publisher, year, edition, pages
Elsevier, 2023. Vol. 166, article id 104499
Keywords [en]
Drag coefficient, Stefan flow, Neighboring particles, Boundary layer, Multiphase reactive flow
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-97645DOI: 10.1016/j.ijmultiphaseflow.2023.104499Scopus ID: 2-s2.0-85159152810OAI: oai:DiVA.org:ltu-97645DiVA, id: diva2:1760121
Funder
Swedish Research Council, (2018-05973, 2015-05588)EU, Horizon 2020, (764697)
Note

Validerad;2023;Nivå 2;2023-05-29 (joosat);

Funder: Swedish for Gasification Center; Research council of Norway (267916)

Licens fulltext: CC BY License

Available from: 2023-05-29 Created: 2023-05-29 Last updated: 2023-09-06Bibliographically approved

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Jayawickrama, Thamali RajikaChishty, Muhammad AqibHaugen, Nils Erland L.Umeki, Kentaro

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