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The effect of Stefan flow on the drag coefficient of spherical particles in a gas flow
Lulea Univ Technol, Div Energy Sci, Energy Engn, S-97187 Lulea, Sweden..
Norwegian Univ Sci & Technol, Dept Energy & Proc Engn, Kolbjorn Hejes Vei 1 B, N-7491 Trondheim, Norway.;SINTEF Energy Res, Dept Thermal Energy, Kolbjorn Hejes Vei 1 A, N-7491 Trondheim, Norway..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering.ORCID iD: 0000-0001-7995-3151
Lulea Univ Technol, Div Energy Sci, Energy Engn, S-97187 Lulea, Sweden..
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2019 (English)In: International Journal of Multiphase Flow, ISSN 0301-9322, E-ISSN 1879-3533, Vol. 117, p. 130-137Article in journal (Refereed) Published
Abstract [en]

Particle laden flows with reactive particles are common in industrial applications. Chemical reactions inside the particle can generate a Stefan flow that affects heat, mass and momentum transfer between the particle and the bulk flow. This study aims at investigating the effect of Stefan flow on the drag coefficient of a spherical particle immersed in a uniform flow under isothermal conditions. Fully resolved simulations were carried out for particle Reynolds numbers ranging from 0.2 to 14 and Stefan flow Reynolds numbers from (-1) to 3, using the immersed boundary method for treating fluid-solid interactions. Results showed that the drag coefficient decreased with an increase of the outward Stefan flow. The main reason was the change in viscous force by the expansion of the boundary layer surrounding the particle. A simple model was developed based on this physical interpretation. With only one fitting parameter, the performance of the model to describe the simulation data were comparable to previous empirical models. The Authors.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 117, p. 130-137
Keywords [en]
Drag coefficient, Stefan flow, Boundary layer, Multiphase reactive flow
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-255367DOI: 10.1016/j.ijmultiphaseflow.2019.04.022ISI: 000474496000010Scopus ID: 2-s2.0-85065836366OAI: oai:DiVA.org:kth-255367DiVA, id: diva2:1339626
Note

QC 20190730

Available from: 2019-07-30 Created: 2019-07-30 Last updated: 2019-07-30Bibliographically approved

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Bäbler, Matthäus

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