Numerical analysis of discrete phase induced effects on a gas flow in a turbulent two-phase free jet

Stakić, Milan; Živković, Goran; Sijerčić, Miroslav

doi:10.1016/j.ijheatmasstransfer.2011.02.039

Cited by 14 publications

(10 citation statements)

References 7 publications

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“…Milan et al [4] carried out a numerical study to analyse the air solid flow inside a tube and the jet flow at the outlet of the tube. They examined the impact of addition solid particles on velocity profiles.…”

Section: Introductionmentioning

confidence: 99%

Effect of sand particles on flow structure of free jet from a nozzle

Al-Dulaimi

Hamad

Rasool

et al. 2019

JMES

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The Characteristics of single and two- phase flow from a circular turbulent free jet from a nozzle of 10 mm diameter were investigated experimentally and numerically. The measurements were conducted for ReJ = 10007 - 31561. The velocity was measured at location from the nozzle y/D (0-8) in axial and radial directions. The two phase measurement were done by using natural construction sand as a solid phase of sizes (220,350,550) µm and loading ratios (mass flow ratio of sand to mass flow rate of air) in the range (0.18-1.38). Two phase air velocity of jet showed that the introducing of natural sand particles gives lower jet velocity attributed to momentum transfer to particles. The smaller particle size leads to lower values of velocity. The velocity found to be decreased with loading ratio increase. The numerical simulation was performed for single and two phase jet flow. RNG K-ε turbulence model was used to simulate the flow of fluid and the discrete phase model to simulate the particles flow. The results form numerical simulation showed a good agreement with experimental results.

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Section: Introductionmentioning

confidence: 99%

Effect of sand particles on flow structure of free jet from a nozzle

Al-Dulaimi

Hamad

Rasool

et al. 2019

JMES

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“…The dispersed phase phenomena are related to turbulent fluctuations in the gas phase. Until now, the turbulent diffusion phenomena have not yet been satisfactorily explained [7].…”

Section: Introductionmentioning

confidence: 99%

A Computational Study of the Gas-Solid Suspension Flow through a Supersonic Nozzle

Sun¹,

Kim²,

Park³

et al. 2012

OJFD

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The present study focuses on numerical simulation of the gas-solid suspension flow in a supersonic nozzle. The Euler-Lagrange approach using a Discrete Phase Model (DPM) has been used to solve the compressible Navier-Stokes equations. A fully implicit finite volume scheme has been employed to discretize the governing equations. Based upon the present CFD results, the particle loading effect on gas-solid suspension flow was investigated. The results show that the presence of particles has a big influence on the gas phase behavior. The structure of shock train, the separation point, and the vortex of the backflow are all related to particle loading. As the particle loading increases the flow characteristics behave differently such as 1) the strength of shock train decreases, 2) the separation point moves toward the nozzle exit, 3) the number and strength of vortex increase, 4) the strength of first shock also increases while the other pseudo shocks decreases. The change of gas flow behavior in turn affects the particle distribution. The particles are concentrated at the shear layers separated from the upper wall surface.

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“…Prediction of the particle trajectory is based on integrating the force balance on the particle, which is based on the Lagrangian formulation . The balance of inertia, drag and gravitational forces acts on the particle in the longitudinal direction as

\frac{d u_{p}}{dt} = F_{D} ((), u - u_{p}) + \frac{g_{x} ((), ρ_{p} - ρ)}{ρ_{p}},

F_{D} = \frac{18 μ}{ρ_{p} d_{p}^{2}} \frac{C_{D} italicRe}{24},

where the term F D ( u − u p ) is the drag force per unit particle mass and F D the drag force encountered by the particle.…”

Section: Cfd Model and Simulationmentioning

confidence: 99%

Effects of the geometrical configuration of air–water mixer on the size and distribution of microbubbles in aeration systems

Basso

Hamad

Ganesan

2018

Asia-Pacific J Chem Eng

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The objective of this work is to present a novel geometrical configuration for microbubble generators (MBGs) to improve dissolved-oxygen levels in water.Among various methodologies from the literature, Orifice and Venturi tubes have been considered as baseline cases. Experimental data from the literature are used to verify a computational fluid dynamics (CFD) case developed for a better understanding of the dynamics of MBGs. As a result, the validated CFD setup has been implemented on a modified Venturi-type generator, where air is injected coaxially with respect to the tube axis, whereas a helicoid wall at variable pitch angle is used. Results show a reduction in the mean bubble diameter distribution from the baseline Venturi tubes, particularly, at lowspeed inlet velocities. This is of interest, especially to decrease the energy requirement for most common water aeration systems.

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Numerical analysis of discrete phase induced effects on a gas flow in a turbulent two-phase free jet

Cited by 14 publications

References 7 publications

Effect of sand particles on flow structure of free jet from a nozzle

Effect of sand particles on flow structure of free jet from a nozzle

A Computational Study of the Gas-Solid Suspension Flow through a Supersonic Nozzle

Effects of the geometrical configuration of air–water mixer on the size and distribution of microbubbles in aeration systems

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