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Gas-solid flow in a diffuser:Effect of inter-particle and particle-wall collisions

Particuology 2021年第4期19卷 187-200页

作者： Santosh Kumar Senapati Sukanta K.Dash CFD Laboratory Department of Mechanical EngineeringIndian Institute of Technology KharagpurWest Bengal721302India

This article investigates the role of the specularity coefficient(φ,the extent of the energy dissipation due to particle-wall collisions),inter-particle restitution coefficient(e_(pp),the extent of the energy dissipation due to inter-particle collisions),and four combinations of these variables on the hydrodynamics,and the pressure recovery of the dilute gas-solid suspension in a *** investigation applies the two-fluid modeling approach along with the kinetic theory of the granular *** present investigation’s findings indicate that an increase inφor a reduction in e_(pp) reduces the pressure recovery by weakening the reverse momentum transfer phenomenon,which is recognized as the primary means for the pressure ***,in a gas-solid flow system,a higherφor smaller e_(pp) enhances the particles’trapping in the recirculation *** recirculation zone’s strength and size increase asφincreases or e_(pp) ***,an increase in the wall-particle and inter-particle interactions strengthens the sidewise displacement of the *** effect of the wall-particle and inter-particle interactions are insignificant for extremely small solid loading.

关键词： Gas-solid flow Diffuser Particle-wall collision Inter-particle collision Pressure recovery reattachment length

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Prediction of Turbulent Flow Structure in a Fully Developed Rib-Roughened Narrow Rectangular Channel

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Journal of Thermal Science 2009年第2期18卷 126-136页

作者： Md.Shafiqul Islam M.Kaminaga R.Hino M.Monde Atomic Energy Research Establishment Japan Atomic Energy Agency (JAEA) Department of Mechanical Engineering Saga University

Fully developed turbulent water-flow structure over one-side repeated-ribs in narrow two-dimensional rectangular channels was investigated experimentally by Particle Image Velocimetry （PIV） and analytically by the standard k-ε and nonlinear k-ε turbulent models. Two rib-pitch to height ratios （p/k） of 10 and 20 were investigated while the rib height was held constant at 4 mm. The rib height-to-channel equivalent diameter ratio （k/De） was 0.1. The streamwise mean velocity and turbulent kinetic energy distributions at six selected axial stations from the center rib for the two Reynolds number （Re） of 7,000 and 20,000 were obtained and compared with the predicted one. The performance ability in predicting separating and reattaching turbulent water-flow between the standard K-ε and nonlinear k-ε models had yielded no clear conclusion. A large-scale turbulent eddy was generated by the rib promoter and then propagated into the mainstream flow, which led to the deformation of the velocity profile. The turbulent kinetic energy was increased about two times higher at p/k = 20 than that at p/k =10 under the two Reynolds numbers. The effect of the p/k value and the Reynolds number （Re） on reattachment length （XR） was investigated and showed that the p/k and Re had no significant effect on the reattachment length beyond a critical value of Re = 15,000 where XR was found to be approximately 4 times of the rib height under water-flow condition.

关键词： Turbulent water-flow structure repeated-ribs narrow rectangular channels two-dimensional analysis reattachment length

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Analysis of flow over backward facing step with transition

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Frontiers of Structural and Civil Engineering 2015年第1期9卷 71-81页

作者： Dwarikanath RATHA Arindam SARKAR Civil Engineering Department Thapar University Patiala Punjab 147001 India School of Infrastructure Indian Institute of Technology Bhubaneswar 751013 India

The present study deals with the study of the velocity distribution and the separation phenomenon of flow of air over a two dimensional backward facing step. The flow of air over a backward facing step has been investigated numerically using FLUENT. Flow simulation has been carried out in a backward facing step having an expansion ratio （ratio of the height before and after the step） of 1：1.94 and the results obtained are compared with the published experimental results. Comparison of flow characteristics between steps with three different transitions is made. The variation ofreattachment length for all the three cases are analyzed for wide range of Reynolds number ranging from 100 to 7000 which covers the laminar, transition and turbulent flow of air. Simulation of the flow over steps with expansion ratios of 1：1.24, 1：1.38, 1：1.47, 1：1.53, 1：1.94, 1：2.20 are also carried out to examine the effect of different expansion ratios on the reattachment length. It is found that the primary reattachment length increases with increase in the expansion ratio. The primary reattachment length at the bottom wall downstream of the step is minimum for the step with round edged transition and maximum for the step with a vertical drop transition.

关键词： reattachment length backward facing step transition flow separation k-ε model

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