Experimental Investigation on Turbulence Modulation in the Boundary Layer of a Horizontal Particle-laden Channel Flow with Relative Low Mass Loading Ratios

This paper represents a review of the recent researches that investigate the behavior of the gas turbulent flow laden with solid particles. The significant parameters that influence the interactions between the both phases, such as particle size, loading ratio and the gas velocity, have been extensively reviewed. Those parameters are presented in dimensionless numbers in which the applicability of studying its effect in terms of all circumstances of the gas turbulent channel flow at different condition is possible. The represented results show that the turbulence degree is proportional to the particle size. It was found that at the most flow conditions even at low mass ratio, the particle shape, density and size significantly alter the turbulence characteristics. However, the results demonstrate that the particle Reynolds number is a vital sign: the turbulence field becomes weaker if particle Reynolds number is lower than the critical limit and vies verse. The gas velocity has a strong effect on the particles settling along the channel flow and as a result, the pressure drop will be affected.

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“…The effect of small mass loading ratio has been investigated [42]. The turbulence is decreased within the whole of the cross section of the pipe.…”

Section: The Particles Intensity Effectmentioning

confidence: 99%

Solid Particles Injection in Gas Turbulent Channel Flow

Kabeel¹,

Elkelawy²,

Bastawissi³

et al. 2016

EPE

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“…Li [38] investigated a fully develop horizontal channel gas-solid flow with dp = 60 and 110 μm for small Φ m . By a simultaneous two-phase PIV measurement technique they found a reduction in the relative mean velocity in the core region and increase of it in the near wall region when adding particles.…”

Section: Particle Volume Fraction and Mass Loadingmentioning

confidence: 99%

Turbulent Modulation in Particulate Flow: A Review of Critical Variables

Saber¹,

Lundström²,

Hellström³

2015

ENG

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A review of the main mechanisms influencing turbulent modulation in the presence of spherical and non-spherical particles is presented. The review demonstrates the need for more numerical and experimental work with higher accuracy than obtained so far and the need to resolve the flow near the surface of particles with the aim to re-evaluate the quantitative effect of different parameters on turbulent modulation. The review reveals that non-spherical particles have more adverse effect on turbulence as compared to spherical ones, for the same ambient conditions.

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Lagrangian wavelet analysis of turbulence modulation in particle–liquid mixing flows

Savari

Barigou

2022

Physics of Fluids

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A new experimental-theoretical framework has been developed to investigate turbulence and turbulence modulation in a two-phase multi-component particle-liquid flow in a mechanically agitated vessel. A discrete wavelet transform is used to decompose long-term three-dimensional Lagrangian trajectories of flow phases, acquired by a technique of positron emission particle tracking, into their deterministic and stochastic sub-trajectories. The sub-trajectories are then used to construct the different-scale local velocity and turbulent kinetic energy fields of the two-phase flow. The effects of particle size and size distribution mode (mono, binary and polydisperse), particle concentration, impeller agitation speed and pumping mode on turbulence intensity are investigated. Amongst these factors, particle size, impeller pumping mode and particle size distribution mode have a significant impact on liquid turbulence. The presence of large particles enhances liquid turbulence and broadens the region in the vessel characterised by high local turbulent kinetic energy (TKE) values. Results also show that a down-pumping pitched blade turbine generates significantly greater local maxima in the TKE field, which tend to be more localized in the impeller discharge stream. In addition, binary or polydisperse suspensions containing higher fractions of larger particles produce higher turbulence intensities in the carrier phase. The detailed information obtained on turbulence intensity is crucial for a better understanding of the dynamics of particle-liquid flows inside mixing vessels to aid the rational design of these units.

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Experimental Investigation on Turbulence Modulation in the Boundary Layer of a Horizontal Particle-laden Channel Flow with Relative Low Mass Loading Ratios

Cited by 5 publications

References 17 publications

Solid Particles Injection in Gas Turbulent Channel Flow

Solid Particles Injection in Gas Turbulent Channel Flow

Turbulent Modulation in Particulate Flow: A Review of Critical Variables

Lagrangian wavelet analysis of turbulence modulation in particle–liquid mixing flows

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