Study of four-way coupling on turbulent particle-laden jet flows

Laı́n, Santiago; Garcı́a, Juan Antonio

doi:10.1016/j.ces.2006.07.005

Cited by 27 publications

(12 citation statements)

References 34 publications

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“…A similar study (Lain and Garcia, 2006) used the same approach and focused on the additional dissipation of turbulent kinetic energy by the particles using the four-way coupling model. Particulate collisions were calculated by a stochastic collision model.…”

Section: Article In Pressmentioning

confidence: 98%

RANS modeling of a particulate turbulent round jet

Kartushinsky

Michaelides

Rudi

et al. 2010

Chemical Engineering Science

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Section: Article In Pressmentioning

confidence: 98%

RANS modeling of a particulate turbulent round jet

Kartushinsky

Michaelides

Rudi

et al. 2010

Chemical Engineering Science

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“…For the numerical prediction of pneumatic conveying the Euler=Lagrange approach was further developed to account for all relevant elementary processes, such as transverse lift forces, wall roughness, interparticle collisions, and coupling between the phases (Laín, 2010(Laín, , 2011Laín and García, 2006;Laín et al, 2011). The present investigation is a three-dimensional (3-D) study of particle behavior in a particle-laden 6 m long horizontal channel with rectangular cross section from a numerical perspective.…”

Section: S Laínmentioning

confidence: 99%

Pneumatic Conveying of Solids Along a Channel With Different Wall Roughness

Laı́n

2013

Chemical Engineering Communications

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The present contribution describes three-dimensional Euler=Lagrange calculations of confined horizontal gas-particle flows emphasizing the importance of elementary processes, such as particle collisions with rough walls and interparticle collisions, on the predicted two-phase flow variables and pressure drop along the duct. In the chosen configuration the pneumatic conveying of spherical particles along a 6 m long horizontal channel with rectangular cross section is described from a numerical perspective. Calculations were carried out for spherical glass beads of different diameters (130 and 195 lm) with a mass loading of 1.0 (kg particles=kg gas). Additionally, different wall roughnesses were considered. In the experiments, the air volume flow rate was constant to maintain a fixed gas average velocity of 20 m=s. The numerical computations were performed by the Euler=Lagrange approach in connection with a Reynolds stress turbulence model accounting for two-way coupling and interparticle collisions. For the calculation of particle motion all relevant forces (i.e., drag, slip-shear and slip-rotational lift, and gravity), interparticle collisions and particle-rough wall collisions were considered. The agreement of the computations with the experiments of Sommerfeld and Kussin (2004) was found to be satisfactory for pressure drop and mean and fluctuating velocities of both phases as well as for the normalized particle mass flux.

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“…The diameter of the nozzle where the particles exited in the axisymmetric air jet had a diameter of 12 mm. Lain and Garcia (2006) found at the nozzle exit, particles had a lower mean velocity than the gas. This means the particles accelerate in the fluid taking momentum from the gas up to a distance of up to 10 diameter lengths downstream in the flow.…”

Section: Concentric Jet Flowmentioning

confidence: 87%

“…Further on in the flow, the particles have a higher mean velocity than the gas. Lain and Garcia (2006) also noted that as the loading of the particles increased, the radial spreading of the jet decreased. This implies the mean velocity values of both the particle and gas increase downstream as the loading increases.…”

Section: Figure 25a Levy and Lockwood Experimental Mean Axial Gas mentioning

confidence: 91%

“…The assumptions proved to be valid as the predicted and measured values for the velocity profile of the particles and the gas matched, and were found to be very similar to those found later by Shuen and associates and published in their 1985 paper. Lain and Garcia (2006) studied the four-way coupling process on particle-laden jet flows. A numerical simulation was completed first using Euler/Lagrange methodology.…”

Section: Concentric Jet Flowmentioning

confidence: 99%

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Fine particle separation in a riser with flow modifications

Wimer¹

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Fine particle separation is of great interest in industry. Coal and mineral processing industries are currently very interested in particle separation for its potential in cleaning coal matter. A circulating fluidized bed riser system has been constructed to investigate possible separation of coal containing pyrite from clean coal. The system was constructed to operate using compressed air in which an air-solid mixture would pass through the riser and the solids would enter in to a dense, product, or filter collection bin. Several different variables were investigated during the project such as the collection ring wall height, particle entrance size into the riser, and mass flux of particles into the riser. By changing the particle entrance into the riser, and changing the ratio of nozzle flow and particle mass flux, a jet style flow could be achieved. The objective of this investigation was to observe how changing the flow field in a circulating fluidized bed would affect particle separation. The first experiment was conducted using a mixture of sand and steel shot with particles sizes between 250 and 500 micron. Results from using the sand and steel shot proved to be very promising as more than 90% of the steel shot could be collected from the sand. The results were then used to determine the experimental conditions that were to be used while separating pyrite laden coal particles from clean coal. There was approximately 1% initial pyrite in the mixture and size ranges for the particles were between 105 and 210 micron. The results using the run-of-mine coal were not as promising as those of the sand and steel shot as a maximum of 25% of the pyritic laden coal could be separated from the cleaner coal. A third experiment was then performed in which chunks of pure pyrite were crushed and then added into clean coal and run through similar separation conditions to the run-of-mine coal. The mixture contained 4% pyrite, and both the pure pyrite and clean coal size ranges were between 105 and 210 micron. The results from this test proved to be very good as up to 77% of the pure pyrite could be recovered from the clean coal.

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Study of four-way coupling on turbulent particle-laden jet flows

Cited by 27 publications

References 34 publications

RANS modeling of a particulate turbulent round jet

RANS modeling of a particulate turbulent round jet

Pneumatic Conveying of Solids Along a Channel With Different Wall Roughness

Fine particle separation in a riser with flow modifications

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