A novel coalescence model for binary collision of identical wet particles

Darabi, Pirooz; Pougatch, Konstantin; Salcudean, M.; Grecov, Dana

doi:10.1016/j.ces.2009.01.017

Cited by 30 publications

(22 citation statements)

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“…In untethered collision, the additional force is provided by capillary forces. Recall that, here, Ca is large, implying that capillary forces should be negligible [15]. Therefore, somewhat surprisingly, even when Ca is large, capillary forces are non-negligible for oblique collisions and thus are included in the theory (but not in the theory for the experiments since string tension overshadows capillary forces).…”

Section: Capillary Forcesmentioning

confidence: 96%

Mechanisms for agglomeration and deagglomeration following oblique collisions of wet particles

et al. 2012

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Previous studies on wetted, particle-particle collisions have been limited to head-on collisions, but in many-particle flows, collisions are inherently oblique. In this work, we explore such oblique collisions experimentally and theoretically. Whereas in normal collisions particles rebound only due to solid deformation, we observe in oblique collisions a new outcome where the particles initially form a rotating doublet and then deagglomerate at a later time due to so-called centrifugal forces. Surprisingly, we discover the essential role of capillary forces in oblique collisions even when the capillary number (viscous over capillary forces) is high. This recognition leads to the introduction of a dimensionless number, the centrifugal number (centrifugal over capillary forces), which together with the previously established Stokes number characterizes the regime map of outcomes. Unexpectedly, we observe a normal restitution coefficient greater than unity at large impact angles, the mechanism for which may also be observed in other agglomerating systems.

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Section: Capillary Forcesmentioning

confidence: 96%

Mechanisms for agglomeration and deagglomeration following oblique collisions of wet particles

et al. 2012

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“…Fortunately, wet particle collisions and the associated liquid redistribution have recently been studied via both experiments and simulations . In case wet particles collide, liquid bridges form, which induce liquid bridge forces between particles.…”

Section: Introductionmentioning

confidence: 99%

The effect of liquid bridge model details on the dynamics of wet fluidized beds

Khinast

Radl

2017

AIChE Journal

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Wet fluidized beds of particles in small periodic domains are simulated using the CFD-DEM approach. A liquid bridge is formed upon particle-particle collisions, which then ruptures when the particle separation exceeds a critical distance. The simulations take into account both surface tension and viscous forces due to the liquid bridge. We perform a series of simulations based on different liquid bridge formation models: (1) the static bridge model of Shi and McCarthy, (2) a simple static version of the model of Wu et al., as well as (3) the full dynamic bridge model of Wu et al. We systematically compare the differences caused by different liquid bridge formation models, as well as their sensitivity to system parameters. Finally, we provide recommendations for which systems a dynamic liquid bridge model must be used, and for which application this appears to be less important.The work is normalized by with the particle's kinetic energy assuming it is moving with particle terminal setting velocity. [Color figure can be viewed at wileyonlinelibrary.com] AIChE Journal

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“…A comprehensive chronological review of the research up to 1980 concerning the pendular bridges between solid bodies was conducted by Mehrotra and Sastry (1980), who showed that significant improvements could be made in this area. Following their review, a significant amount of research was conducted in this area, with the following two major goals: (1) improving the force and energy expressions associated with pendular liquid bridges (e.g., Chan and Horn, 1985;Darabi et al, 2009;Ennis et al, 1990Ennis et al, , 1991Lian et al, 1993;Mazzone et al, 1987;Mikami et al, 1998;Pitois et al, 2000Pitois et al, , 2001Simons et al, 1994;Soulie et al, 2006) and (2) obtaining a better understanding of the stability and modeling the evolution of pendular liquid bridges (Dai and Lu, 1998;De Bisschop and Rigole, 1982;Lian et al, 1993;Mazzone et al, 1986;Pepin et al, 2000aPepin et al, , 2000bShi and McCarthy, 2008).…”

Section: Introductionmentioning

confidence: 99%