TITLE

Deposition of Solid Particles in Convective Flow Over Backward-Facing Step Under the Effect of Radiative Heat Transfer

AUTHOR(S)
Golkarfard, V.; Nassab, S. A. Gandjalikhan; Ansari, A. B.
PUB. DATE
July 2011
SOURCE
International Review of Mechanical Engineering;Jul2011, Vol. 5 Issue 5, p867
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A numerical simulation procedure for studying deposition of aerosol particles in a laminar convection flow of radiating gas over a backward-facing step including the effect of thermal force is developed. In the gas flow, all of the heat transfer mechanisms consisting of conduction, convection and radiation take place simultaneously. Behavior of solid particles is studied numerically based on an Eulerian-Lagrangian method. Two dimensional Navier-Stokes and energy equations are solved using CFD techniques, while the radiating transfer equation (RTE) is solved by discrete ordinate method (DOM) for calculating radiative heat flux distribution. The objective of this research is to study the effects of Reynolds number and diameter variation, thermophoresis and radiation on deposition of particles. The thermal condition involved constant wall temperature for both top and bottom walls in which the bottom wall has higher temperature. The variation of Reynolds number is a parameter that influences the deposition of particles. Numerical results show a decrease in deposition percent by increasing in Reynolds number. Thermophoresis causes increases in deposition for 0.1 µm particles and its effect reversed for 1 µm ones. Finally, it is revealed that radiation causes slight increase in particle deposition.
ACCESSION #
76125805

 

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