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Lookup NU author(s): Chunyu JIN, Dr Ian Potts, Emeritus Professor Mike Reeks
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We present a simple stochastic quadrant model for calculating the transport and deposition of heavy particles in a fully developed turbulent boundary layer based on the statistics of wall-normal fluid velocity fluctuations obtained from a fully developed channel flow. Individual particles are tracked through the boundary layer via their interactions with a succession of random eddies found in each of the quadrants of the fluid Reynolds shear stress domain in a homogeneous Markov chain process. In this way, we are able to account directly for the influence of ejection and sweeping events as others have done but without resorting to the use of adjustable parameters. Deposition rate predictions for a wide range of heavy particles predicted by the model compare well with benchmark experimental measurements. In addition, deposition rates are compared with those obtained from continuous random walk models and Langevin equation based ejection and sweep models which noticeably give significantly lower deposition rates. Various statistics related to the particle near wall behavior are also presented. Finally, we consider the model limitations in using the model to calculate deposition in more complex flows where the near wall turbulence may be significantly different. (C) 2015 AIP Publishing LLC.
Author(s): Jin C, Potts I, Reeks MW
Publication type: Article
Publication status: Published
Journal: Physics of Fluids
Year: 2015
Volume: 27
Issue: 5
Print publication date: 01/05/2015
Online publication date: 29/05/2015
Acceptance date: 10/05/2015
ISSN (print): 1070-6631
ISSN (electronic): 1089-7666
Publisher: American Institute of Physics
URL: http://dx.doi.org/10.1063/1.4921490
DOI: 10.1063/1.4921490
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