Particle interaction in three-phase polydisperse flows

Dubrovskyi, V.V.; Podvysotsky, A. M.; Shraiber, A. A.

doi:10.1016/0301-9322(92)90021-8

Cited by 32 publications

(20 citation statements)

References 11 publications

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“…Except for the rebound scenario (1), which is apparently a noncapture mode, scenarios 2-4 can be included under the capture mode; whilst scenario 5 belongs to the shooting through mode earlier reported by Dubrovsky et al [15]. Such interaction characteristics are governed by the interplay of different forces at the interface and in the bulk fluid.…”

Section: Model Descriptionmentioning

confidence: 96%

“…A background was established in the previous section to introduce the concept that when a solid particle impacts onto a droplet it will either pass through or be captured by the droplet [15]. Delving further into this, it could be realized that in either case, there is either partial or complete penetration of the gas-liquid interface by the particle which can be demonstrated by the five possible scenarios as shown in Fig.…”

Section: Model Descriptionmentioning

confidence: 99%

“…Of the very limited studies available on the interaction of particle with a curved interface, work of Dubrovsky et al [15] possibly could be considered as a benchmark study in this area. They carried out extensive experiments on droplet-particle collision using particles and droplets of different sizes and physical properties.…”

Section: Introductionmentioning

confidence: 99%

“…On numerical studies in this area, Wu et al [15] studied the penetration behaviour of ceramic particulates into molten aluminium (Al) droplets during spray atomization and co-injection using a force balance model. Factors that affect the penetration behaviour of ceramic particulates into Al droplets were systematically discussed which included size, morphology, density of ceramic particulate; wetting angle between ceramic and liquid A1; and fraction of solid contained in the semi-liquid droplets.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Collision behaviour of a smaller particle into a larger stationary droplet

Mitra

Doroodchi

Pareek

et al. 2015

Advanced Powder Technology

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Section: Model Descriptionmentioning

confidence: 96%

Section: Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Collision behaviour of a smaller particle into a larger stationary droplet

Mitra

Doroodchi

Pareek

et al. 2015

Advanced Powder Technology

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“…Particle-droplet impacts 32 or droplet coalescence are largely studied at a small scale, 33,34 particularly in sprays. 35,36 Kinetic descriptions are also available in macroscale, for instance in the use of viscous and deformation Stokes numbers in wet granulation, which applies to granules with an elastic core and an outer binder layer.…”

Section: Deposition and Contact Mechanicsmentioning

confidence: 99%

The role of wall deposition and re‐entrainment in swirl spray dryers

et al. 2015

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A new experimental method is outlined to study fouling in spray dryers and similar devices. In essence, it makes the deposits traceable so that one can quantify the material that comes off the walls, how long it remains there and how the deposits agglomerate with particles in the air. This paper investigates a countercurrent swirl spray dryer of detergent and provides sound evidence that fouling is a dynamic process: clusters form and break at the walls renewing an active layer of deposits. Remarkably, the wall generates >20% of the product and most of the large granules, and increases drastically the residence time of the powder. The assumptions of current numerical models are clearly invalid (i.e. particles rebound at the wall or deposit indefinitely). Several re-entrainment mechanisms and their times scales are identified in this work, and accordingly, a new general framework to describe fouling in spray dryers is proposed.

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Interaction dynamics of a spherical particle with a suspended liquid film

et al. 2015

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Hydrodynamics of collision interactions between a particle and gas-liquid interface such as droplet/film is of keen interest in many engineering applications. The collision interaction between a suspended liquid (water) film of thickness 3.41 6 0.04 mm and an impacting hydrophilic particle (glass ballotini) of different diameters (1.1-3.0 mm) in low particle impact Weber number (We 5 q l v 2 p d p =r) range (1.4-33) is reported. Two distinct outcomes were observed-particle retention in the film at lower Weber number and complete penetration of the film toward higher Weber number cases. A collision parameter was defined based on energy balance approach to demarcate these two interaction regimes which agreed reasonably well with the experimental outcomes. It was shown that the liquid ligament forming in the complete penetration cases breaks up purely by "dripping/end pinch-off" mechanism and not due to capillary wave instability. An analytical model based on energy balance approach was proposed to determine the liquid mass entrainment associated with the ligament which compared well with the experimental measurements. A good correlation between the %film mass entrained and the particle Bond number (Bo 5 q l gd 2 p =r) was obtained which indicated a dependency of Bo 1.72 . Computationally, a three-dimensional CFD model was developed to simulate these interactions using different contact angle boundary conditions which in general showed reasonable agreement with experiment but also indicated deficiency of a constant contact angle value to depict the interaction physics in entirety. The computed force profiles from computational fluid dynamics (CFD) model suggest dominance of the pressure force over the viscous force almost by an order of magnitude in all the Weber number cases studied. V C 2015 American Institute of Chemical Engineers AIChE J, 62: [295][296][297][298][299][300][301][302][303][304][305][306][307][308][309][310][311][312][313][314] 2016

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Particle interaction in three-phase polydisperse flows

Cited by 32 publications

References 11 publications

Collision behaviour of a smaller particle into a larger stationary droplet

Collision behaviour of a smaller particle into a larger stationary droplet

The role of wall deposition and re‐entrainment in swirl spray dryers

Interaction dynamics of a spherical particle with a suspended liquid film

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