LES-DPM simulation of turbulent gas-particle flow on opposed round jets

Sun, Wenjing; Wang, Zhong; Zhang, Yong

doi:10.1016/j.powtec.2014.10.039

Cited by 27 publications

(8 citation statements)

References 37 publications

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“…Much work has been done on the flow and turbulence characteristics of the flow field in coaxial impinging stream reactors [20][21][22][23][24]. Huai et al have studied drying and flow characteristics in a semicircular impinging stream reactor.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on Flow and Turbulence Characteristics of Impinging Stream Reactors with Dynamic Inlet Velocity Variation

Liu

Yue²,

et al. 2018

Energies

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Impinging stream technique has been widely used in engineering industries. Insufficient data are available on the effects of dynamic inflow conditions on the flow and turbulence characteristics of an impinging stream reactor. In this study, we investigate and discuss the flow and turbulence characteristics of an impinging stream reactor with dynamic inlet velocity variation, e.g., sinusoidal, parabolic, step or triangular variation. The effects of period, amplitude, phase difference, mean inlet velocity and type of dynamic inlet velocity variation on the motional behaviors of the impinging surface and the mean turbulence kinetic energy (k) of the impingement region are investigated and discussed using particle image velocimetry (PIV) and computational fluid dynamics (CFD) at various values of L/D (the ratio of impinging spacing to nozzle diameter). The results show that the impinging surface makes back-and-forth motions in impinging stream reactors with dynamic inlet velocity variation. The mean k of the impingement region during one period is dominated by both the inlet velocity conditions and the geometric configuration. Dynamic inflow conditions bring more turbulence energy and pulsating characteristics to impinging zones over constant inlet velocity for an instantaneously moving impinging surface. Impinging stream reactors with dynamic inlet velocity variation provides more intense turbulence properties over conventional impinging stream reactors at the same mean inlet velocity. This work shows that the impinging streams with dynamic inlet velocity variation has strong potential for future relevant reactors and processes for engineering applications.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on Flow and Turbulence Characteristics of Impinging Stream Reactors with Dynamic Inlet Velocity Variation

Liu

Yue²,

et al. 2018

Energies

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“…Since the particle density is considerably larger than that of the fluid, i.e., ρp/ρ>>1, the Basset force, the buoyancy force, the virtual mass force and the pressure gradient force, could be neglected (D.E. Stock et al (1996); Wenjing Sun et al 2015).…”

Section: Assumptionsmentioning

confidence: 99%

Effect of the Number of Injectors on the Mixing Process in a Rapidly Mixed Type Tubular Flame Burner

Chouari

Kriaa

Mhiri

et al. 2017

JAFM

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Three-dimensional simulations are performed to study the non-reactive mixing process in a rapidly mixed type tubular flame burner (RTFB). The current work examines the effect of the number of injectors (N= 2, 4 and 6) on the mixing process by focusing on three criterions (Flow structure, local swirl intensity and mixing layer thickness). The Discrete Phase Model (DPM) is used to track the particle trajectories. Validation of the numerical results is carried out by comparing the predicted particle trajectories, central recirculation zone (CRZ) and tangential velocity results to the experimental data. It is concluded that the model offers a satisfactory prediction of the flow field in a RTFB. Numerical results show that, for the same geometrical swirl number (Sw) and the same Reynolds number (ReT), the increasing of the number of injectors enhances the mixing process by generating a larger reverse flow and reducing the mixing layer thickness. It is also concluded that the local swirl intensity along of the RTFB can be correlated in terms of geometric swirl number and number of injectors.

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“…The DPM with density difference was limited to study the plane‐wall jet 28 ; this study only analyzed the interaction between the dispersed particles of a vertical downward turbulent wall jet and the fluid turbulence in a uniform flow. The research showed that the DPM had the irreplaceable position for explaining the jet flow and the heterogeneous phase separation process 29–33 . The study about the heterogeneous separation process can apply the supplement theory of the concave‐wall jet.…”

Section: Introductionmentioning

confidence: 99%

“…(b) The instability vortices structures of jet separated from the concave-wall, reproduced from Stern et al (1997) and the heterogeneous phase separation process. [29][30][31][32][33] The study about the heterogeneous separation process can apply the supplement theory of the concave-wall jet.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and instability analysis of particles in liquid–solid concave‐wall jet using DPM‐RSM

Zhang

et al. 2022

Asia-Pacific J Chem Eng

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The liquid–solid concave‐wall jet existed in the vertical cylinder separator with tangential inlet; the instability near concave‐wall was the key factor for centrifugal separation. The effects of jet flowrate and wall curvature radius on the instability of solid‐particles were explored by experiment and numerical simulation. The results showed that the separation efficiency of particles decreased with the increase of centrifugal separation factor. The liquid–solid concave‐wall jet flow in separator was unstable in this study. The decay rate of jet maximum velocity on the concave‐wall was larger than that on plane‐wall jet. The ratio of half‐width value to wall curvature radius was about 0.08 at the circumferential direction 90°, which coincided with the critical value of centrifugal instability in strongly concave‐wall jet. The pressure, velocity, and vorticity fluctuated periodically along streamwise direction in separator. The fluctuation period was linearly related to the wall curvature, and the radial range of fluctuation was only half of jet width. The paired longitudinal vortices formed along the flow direction, and the longitudinal vortices merged at length 0.74 m from the inlet cross‐section along circumferential direction. After the position of vortices merged, the particle trajectory oscillated obviously.

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LES-DPM simulation of turbulent gas-particle flow on opposed round jets

Cited by 27 publications

References 37 publications

Experimental and Numerical Studies on Flow and Turbulence Characteristics of Impinging Stream Reactors with Dynamic Inlet Velocity Variation

Experimental and Numerical Studies on Flow and Turbulence Characteristics of Impinging Stream Reactors with Dynamic Inlet Velocity Variation

Effect of the Number of Injectors on the Mixing Process in a Rapidly Mixed Type Tubular Flame Burner

Numerical simulation and instability analysis of particles in liquid–solid concave‐wall jet using DPM‐RSM

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