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The effect of turbulence on mass transfer rates between inertial polydisperse particles and fluid

Published online by Cambridge University Press:  15 July 2019

Ewa Karchniwy Open the ORCID record for Ewa Karchniwy [Opens in a new window] ,
Adam Klimanek Open the ORCID record for Adam Klimanek [Opens in a new window]  and
Nils Erland L. Haugen Open the ORCID record for Nils Erland L. Haugen [Opens in a new window]
Ewa Karchniwy*
Affiliation:
Department of Energy and Process Engineering, Norwegian University of Science and Technology, Kolbjørn Hejes vei 1B, 7491 Trondheim, Norway Institute of Thermal Technology, Silesian University of Technology, Konarskiego 22, 44-100 Gliwice, Poland
Adam Klimanek
Affiliation:
Institute of Thermal Technology, Silesian University of Technology, Konarskiego 22, 44-100 Gliwice, Poland
Nils Erland L. Haugen
Affiliation:
Department of Energy and Process Engineering, Norwegian University of Science and Technology, Kolbjørn Hejes vei 1B, 7491 Trondheim, Norway SINTEF Energi AS, Sem Saelands vei 11, 7034 Trondheim, Norway
*
†Email address for correspondence: [email protected]
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Abstract

The current work investigates how turbulence affects the mass transfer rate between inertial particles and fluid in a dilute, polydisperse particle system. Direct numerical simulations are performed in which all scales of turbulence are fully resolved and particles are represented in a Lagrangian reference frame. The results show that, similarly to a monodisperse system, the mass transfer rate between particles and fluid decreases as a result of particle clustering. This occurs when the flow time scale (based on the turbulence integral scale) is long relative to the chemical time scale, and is strongest when the particle time scale is one order of magnitude smaller than the flow time scale (i.e. the Stokes number is around 0.1). It is also found that for larger solid mass fractions, the clustering of the heavier particles is enhanced by the effect of drag force from the particles on the fluid (momentum back-reactions or two-way coupling). In particular, when two-way coupling is accounted for, locations of particles of different sizes are much more correlated, which leads to a stronger effect of clustering, and thus a greater reduction of the particle–fluid mass transfer rate.

JFM classification

Reacting Flows: Combustion Reacting Flows: Turbulent reacting flows
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 874 , 10 September 2019 , pp. 1147 - 1168
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Copyright
© 2019 Cambridge University Press 

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