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Effect of Stefan flow on drag coefficient of reactive spherical particles in gas flow

DOI: 10.1615/THMT-18.1250
pages 1089-1092

T.R. Jayawickrama
Division of Energy Sciences, Lulea University of technology, SE-971 87 Lulea, Sweden

N.E.L. Haugen
SINTEF Energy Research, N-7465 Trondheim, Norway

M.U. Babler
Department of Chemical Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden

K. Umeki
Division of Energy Sciences, Lulea University of technology, SE-971 87 Lulea, Sweden

Sinopsis

Particle laden flows with reactive particles are common in industrial applications. Chemical reactions inside the particle or deposition at the surface can generate additional flow phenomena that affect the heat, mass and momentum transfer between the particle and bulk flow. This work aims at investigating the effect of Stefan flow on the drag coefficient of a spherical particle immersed in a uniform flow. Fully resolved 3D simulations were carried out for particle Reynolds numbers based on the free stream velocity ranging from 0.5 to 3. Simulations are carried out in foam-extend CFD software, using the Immersed Boundary(IB) method for treating fluid-solid interactions. The simulations were validated against data for particles without reactive flow, and against the analytical solution for Stefan flow around a particle in a quiescent fluid. We found that in the considered range of Reynolds number the drag coefficient decreases linearly with in increase in Stefan flow velocity.

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