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Kevrekidis Mech Model 1998 - Particle Resuspension Model 1...

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Particle Resuspension Model 1 A NEW MECHANISTIC MODEL FOR THE RESUSPENSION OF PARTICULATE MATTER P. G. Kevrekidis, M. Lazaridis and P. G. Georgopoulos 3rd CRESP Annual Meeting June, 1998 CRESP/EOHSI Exposure Assessment Task Group Environmental and Occupational Health Sciences Institute a joint project of UMDNJ – R. W. Johnson Medical School and Rutgers University 170 Frelinghuysen Road, Piscataway New Jersey 08854 CRESP/EOHSI-Exposure Assessment C omputational C hemodynamics L aboratory
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Particle Resuspension Model 2 ABSTRACT In this work we introduce a new mechanistic model for particle resuspension that could eventually help elucidate the processes leading to atmospheric resuspension of contaminated soil particles at sites of concern. Previous studies on the subject have mainly focused attention on the possibility of inducing resuspension through the lift force of a turbulent flow. Here, we examine the effect of a force acting from a distance and elastically propagating through the creation of bending waves on the surface. Based on a force balance approach we establish the relevance of this factor for realistic values and distributions of the force on the surface by explicit comparison with the adhesive force “binding” the particle to the surface. Our calculations demonstrate that factors such as forces from external sources should be included in more detailed studies of resuspension (experimental and theoretical) and can be appropriately utilized in order to control (induce or avoid) this phenomenon. CRESP/EOHSI-Exposure Assessment C omputational C hemodynamics L aboratory
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Particle Resuspension Model 3 INTRODUCTION Hypothesis Consider the following idealized situation involving a thin surface on which spher- ical particles are bound through adhesive forces. Suppose that we exert a realistic force at a point of the surface at distance R away from the particle.The resulting wave will exert force at each point of the surface. The objective of this study is to examine whether resuspension is feasible by overcoming, through such a force, the maximum adhesive force (pull-off force). Motivation Traditional approaches to the resuspension problem have been based on the application of a turbulent flow, which through the lift force could produce re- suspension of the particle in the flow.
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