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The effect of turbulence on mass transfer rates of small inertial particles with surface reactions

The effect of turbulence on mass transfer rates of small inertial particles with surface reactions

Category
Journal publication
Abstract
The effect of turbulence on the mass transfer between a fluid and embedded small heavy inertial particles that experience surface reactions is studied. For simplicity, the surface reaction, which takes place when a gas phase reactant is converted to a gas phase product at the external surface of the particles, is unimolar and isothermal. Two effects are identified. The first effect is due to the relative velocity between the fluid and the particles, and a model for the relative velocity is presented. The second effect is due to the clustering of particles, where the mass transfer rate is inhibited due to the rapid depletion of the consumed species inside the dense particle clusters. This last effect is relevant for large Damköhler numbers, where the Damköhler number is defined as the ratio of the turbulent and chemical time scales, and it may totally control the mass transfer rate for Damköhler numbers larger than unity. A model that describes how this effect should be incorporated into existing simulation tools that utilize the Reynolds averaged Navier–Stokes approach is presented. © 2017 Cambridge University Press
Client
  • Notur/NorStore / NN9405K
  • Norges forskningsråd / 231444
  • Norges forskningsråd / 232738
Language
English
Author(s)
Affiliation
  • SINTEF Energy Research / Termisk energi
  • Norwegian University of Science and Technology
  • Royal Institute of Technology
Year
2017
Published in
Journal of Fluid Mechanics
ISSN
0022-1120
Volume
836
Page(s)
932 - 951