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COMPUTATIONAL FLUID DYNAMICS ANALYSIS OF IMPACTOR PERFORMANCE

DOI: 10.1615/IHTC13.p22.250
page 13

S. Hari
Energy Systems Laboratory, Texas A&M University, College Station, TX-77840, USA

Yassin A. Hassan
Department of Nuclear Engineering, Texas A&M University, College Station, TX 77843, USA

A. R. McFarland
Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843

Abstract

Performance of a rectangular slit real impactor was analysed using Computational Fluid Dynamics (CFD) techniques. Dispersed two-phase flow in the device was modelled under the Eulerian-Lagrangian framework with a one-way coupling between the phases. Effect of the characteristic geometric ratio S/W (ratio of the separation distance to the throat width) on the impactor performance was investigated for a constant T/W (ratio of the throat length to the throat width) ratio of unity. The calculation was performed for two Reynolds number values (Re = 100 & 3000). Collection efficiency curves at Re = 100 are seen to come closer with an increase in the S/W ratio from 0.25 to 2 and diverge beyond this value. However, at Re = 3000, the curves come closer at lower S/W ratio (up to 2) and remain clustered for higher S/W ratio. Results of the simulation further reveal that the cut-point value (non-dimensional particle size corresponding to 50% collection efficiency) shows a rapid increase at lower S/W ratios for both low and high Reynolds number. However, for increasing S/W ratios (beyond 1.5), the increase is gradual and linear. Rate of increase of the cut-point value with the S/W ratio is higher at Re = 100, compared to Re = 3000.

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