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Micromechanics of agglomeration forced by the capillary bridge: The restitution of momentum
Author(s) -
Balakin Boris V.,
Alyaev Sergey,
Hoffmann Alex C.,
Kosinski Pawel
Publication year - 2013
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14162
Subject(s) - collision , economies of agglomeration , capillary action , mechanics , momentum (technical analysis) , dissipative system , dimensionless quantity , coefficient of restitution , bridge (graph theory) , dissipative particle dynamics , restitution , classical mechanics , physics , thermodynamics , engineering , computer science , medicine , computer security , finance , chemical engineering , law , economics , political science , polymer , nuclear magnetic resonance
The formation of capillary bridge formed by a liquid adsorbate is one of the main reasons for agglomeration in multiphase flows. Agglomeration takes place when the relative momentum of two colliding particles is fully consumed by the bridge. This article presents a theoretical study of the collisions of particles with adsorbed liquid taking into account the influence of capillary and viscous dissipative forces. The article proposes an approximate analytical solution for the dynamics of the bridge formed during the collision, together with a more complete numerical model, which is validated with experimental data. The restitution of the relative momentum of the colliding particles, depending on a series of dimensionless parameters characterizing the bridge, is investigated. A criterion for prediction of agglomeration, or “collision efficiency,” in a flow involving cohesive particles is given. An expression is proposed for the coefficient of restitution for the case of collision via a liquid bridge. © 2013 American Institute of Chemical Engineers AIChE J , 59: 4045–4057, 2013