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A New Approach to Model the Re‐Entrainment of Settled Particles Based on Film Theory of Fluid Mass Transfer Processes
Author(s) -
Nitschke Dirk,
Schmidt Eberhard
Publication year - 2009
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.200800008
Subject(s) - entrainment (biomusicology) , mass transfer , mass transfer coefficient , mechanics , work (physics) , statistical physics , thermodynamics , particle (ecology) , physics , materials science , classical mechanics , geology , oceanography , rhythm , acoustics
This work presents a model that calculates re‐entrainment in analogy to transport processes between fluid phases, which are well known in chemical engineering. Mass transfer processes for fluid phases are described, among other models, by film theory. Re‐entrainment was computed according to the film theory with a mass transfer coefficient. The mass transfer coefficient is just one parameter that determines the re‐entrainment rate. To show that this parameter was accessible by physical principles, outcomes of this model were compared with experimental data published by Ibrahim et al. [1–2]. The mass transfer coefficients for these calculations were determined by a microscopic view of the forces acting on one single particle. This comparison shows that this one parameter model was able to reproduce experimental data of the re‐entrainment of single particles.