Two-Phase Turbulent Flow in a Plane Jet

Goldschmidt, Victor; Eskinazi, S.

doi:10.1115/1.3625176

Cited by 64 publications

(12 citation statements)

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“…Little dispersion is predicted for particles with very large Stokes numbers. This concept offers some explanations for many previous experimental results of increased turbulent transport with increasing particle size (Goldschmidt and Eskinazi, 1966;Householder and Gold-Schmidt, 1969;Goldschmidt et al, 1972;Lilly, 1973;Memmott and Smoot, 1978;Yuu et al, 1978). Numerical results of Gore et al (1985), Chein and Chung (1987), and Chung and Troutt (1987) for particle dispersions in a vortex pair and in a jet have also supported this physical concept.…”

Section: Introductionsupporting

confidence: 55%

Simulation of particle dispersion in a two‐dimensional mixing layer

Chein

Chung

1988

AIChE Journal

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Particle dispersion in a two-dimensional mixing layer is analyzed numerically by calculating the particle trajectories in a free shear layer simulated by discrete vortices. Important global and local flow quantities reported in experimental measurements are reasonably simulated.The particle dispersion results demonstrate that the extent of particle dispersion depends strongly on the Stokes number St, the ratio of particle aerodynamic response time to the characteristic time of the mixing layer flow. Particles with relatively small St values are dispersed at approximately the fluid dispersion rate. Particles with large St values are dispersed at a rate that is less than the fluid rate. Particles with intermediate values of St may get flung outside of the vortex structures in the mixing layer and therefore get dispersed at a higher rate than the fluid. This result is in agreement with some previous experiments in plane and axisymmetric jets. It is also found that a higher dispersion rate is associated with the particles introduced to the flow from the lowspeed side and from near the middle of the mixing layer.

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Section: Introductionsupporting

confidence: 55%

Simulation of particle dispersion in a two‐dimensional mixing layer

Chein

Chung

1988

AIChE Journal

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“…This is a reason why the radial distribution of fluid integral length scale has the maximum value at 7 = 0.5 near the jet exit and becomes nearly constant in the cross-sectional area of the jet when z 5 20 as shown by Laurence (1956). Values of S, at qf = 0.016 and \I' = 0 are the results obtained by Goldschmidt and Eskinazi (1966) in the May, 1978 Page 517 --dust laden plane jet and by Hinze (1959), respectively. Indications of Iog-log plots of experimental distributions of particle concentrations and plots of TPT vs. 1 1 ' in cases of = 18, 21, 25, and 27 are omitted in this paper for the sake of simplicity.…”

Section: Particle Turbulent Diffurivitymentioning

confidence: 74%

“…Bashir and Uberoi (1975) have shown that the turbulent intensity of scalar, as well as that of fluid velocity, satisfies the similarity in the developing region of a two-dimensional jet by measuring experimentally the turbulent intensity of temperature. Goldschmidt and Eskinazi (1966) examined the distribution of concentrations of the liquid particles of the average diameter on a weight basis 3.3 pm in a two-dimensional jet. They indicated that the particle mass tends not to diffuse more easily than the fluid momentum, but only after calculating I f f usivities by the diffusion equation, using the experimental results of the concentration distribution in the same method as Van der Hegge Zijnen ( 1958).…”

Section: Page 510 May 1978mentioning

confidence: 99%

The synthesis of nearly optimal on-off controllers with application to chemical processes

Brosilow¹,

Naphtali²

1965

Chemical Engineering Science

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“…Longweli and Weiss (1953) have studied the mixing and distribution of liquid droplets in high-velocity air streams. Goldschmidt and Eskinazi ( 1966) measured velocity droplet concentrations of pm-size aerosol particles in a plane jet mixing with a secondary stream. Pritts (1970) obtained some nonreactive profile data with 1 pm boron, 50 pm glass beads, and 5.8 and 47.8 pm aluminum particles.…”

Section: Literature Reviewmentioning

confidence: 99%

Particle‐gas dispersion effects in confined coaxial jets

Hedman

Smoot

1975

AIChE Journal

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The objective of this study was to determine the mixing characteristics of two-phase, confined, coaxial jets. Gas composition, gas velocity, and particle mass flux radial profiles were obtained at different axial stations using 20% by weight of 6 or 30 pm spherical aluminum particles in the primary stream. Additional tests were conducted without particles. Radial profiles for gas composition, velocity, and particle flux were correlated using the principle of similarity. In the gas phase, mass mixed more rapidly than momentum, and the 6 pm particles mixed less rapidly than mass or momentum. Systems with low primary density and low secondary velocity mixed most rapidly. An implicit numerical model was developed to predict the rate of mixing of the gadparticle mixture. The model included coupled dynamic and thermal nonequilibrium effects between the gas and solid phases. Many chemical processes utilize separate streams which mix and often react in a vessel. A common method of contacting these streams is to allow them to exhaust from two coaxial jets into a mixing zone. The jets may be either free (that is, exhausting into an unconfined environment) or confined by the vessel walls.The considerable effort expended in characterizing the mixing behavior of gaseous free and confined jets has been reviewed by Stowell and Smoot (1973). The mixing process is substantially more complicated, however, when either of the jet stream? contains a significant fraction of a particulate phase. Only limited data exist which characterize the mixing of the particulate phase or the effect of the particulate phase on the mixing characteristics of the g.ireous phases.The purpose of this research effort was to determine the mixing characteristics of the gaseous and particulate phases of a central primary jet as it mixes with a clean, gaseous secondary jet. The radial profiles of gas composition, gas velocity, and particle mass flux were measured across the mixing zone at various axial positions downstream from the jet exit. Effects of variation in velocity and density of the streams were also examined.The facility utilized high pressure air from a reservoir to supply both the primary and secondary jets. In addition, helium and an aluminum powder were introduced into the electrically heated primary jet. Fine-mesh screens were installed near the exit of both the primary and secondary jets to flatten the exit velocity profiles. Existing instrumentation techniques were adapted to measure the helium composition, gas velocity, and particle mass flux. Mixing experiments were conducted at various secondary to primary mass flow ratios (2.6 to 42), secondary to primary density ratios (1 to 4), and secondary to primary velocity ratio; (0.1 to 0.45). Tests were conducted without particles, and with 6 and 30 pm spherical aluminum particles in the primary stream.A computer model was developed using implicit numerical techniques to predict the behavior of a twophase primary jet mixing with a secondary confined coaxial jet. The model considers gas composit...

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Two-Phase Turbulent Flow in a Plane Jet

Cited by 64 publications

References 0 publications

Simulation of particle dispersion in a two‐dimensional mixing layer

Simulation of particle dispersion in a two‐dimensional mixing layer

The synthesis of nearly optimal on-off controllers with application to chemical processes

Particle‐gas dispersion effects in confined coaxial jets

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