Dilute gas‐particle suspension in a diffuser: A two‐fluid modelling approach

Senapati, Santosh Kumar; Dash, Sukanta Kumar

doi:10.1002/cjce.24131

Cited by 3 publications

(1 citation statement)

References 45 publications

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“…Lighter particle movement was found to result in higher pressure recovery. Additionally, it was discovered that pressure recovery increased with an increase in the inlet slip velocity ratio [36][37][38][39][40][41][42].Further research [43] examined different area ratios and identified two conflicting effects on pressure recovery. Up to a critical area ratio value (9.97), pressure recovery increased, but it decreased beyond that point.…”

Section: Introductionmentioning

confidence: 99%

Modeling Two-Phase Gas-Solid Flow in Axisymmetric Diffusers using Cut Cell Technique: An Eulerian-Eulerian Approach

Salem,

Elreafay,

Abumandour

et al. 2024

Preprint

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Axisymmetric diffusers find wide applications in various industrial processes, including combustion systems, pneumatic conveying, and fluidized bed reactors. Understanding and accurately modeling the behavior of two-phase flows in these devices are critical for optimizing their performance and efficiency. The cut cell technique is employed, providing a flexible and efficient means of representing intricate geometries within axisymmetric domains. The paper discusses the governing equations, numerical discretization schemes, and boundary conditions used in the Eulerian-Eulerian approach with the cut cell technique for axisymmetric diffusers. Various aspects of the two-phase gas-solid flow, including particle-particle and particle-wall interactions, interphase momentum transfer, and phase segregation, are investigated. The governing equations are solved using house developed code called FORTRAN, a widely used programming language in scientific and engineering simulations. The results of this study will provide valuable insights into the behavior of gas-solid two-phase flows in axisymmetric diffuser. A parametric study of the impact of particles diameters (100, 200,300$\mu m$), the solid volume loading ratios $(0.005, 0.008, 0.01)$ and cant angle (4.5°, 7°, 9.5°) effect of axisymmetric diffuser on the local skin friction, pressure, velocity, turbulent kinetic energy, and separation zone.

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Section: Introductionmentioning

confidence: 99%

Modeling Two-Phase Gas-Solid Flow in Axisymmetric Diffusers using Cut Cell Technique: An Eulerian-Eulerian Approach

Salem,

Elreafay,

Abumandour

et al. 2024

Preprint

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Cooling Characteristic of an Infrared Suppression Device With Single Perforated Funnel: A Computational Fluid Dynamics Approach

Mohanty

Senapati

Dash

2022

Journal of Thermal Science and Engineering Applications

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An infrared suppression device is integral to any gas turbine used in naval and cargo ships. Estimating an IRS's cooling characteristics is essential to start the maintenance operation. Thus, the present article presents a computational investigation of the cooling characteristics of an Infrared suppression device with a single cylindrical funnel with or without circular perforations. All simulations have been carried out in a steady and laminar environment. The numerical procedure adopted in this work has been validated with the existing correlations and achieved satisfactory agreement. The effect of the Rayleigh number and the length to diameter ratio of the funnel have been varied within the practical range to observe their effects on the averaged Nusselt number, heat transfer rate, mass suction rate, velocity fields and thermal plumes. Moreover, the cooling performance has been compared for funnels without and with circular perforations. It is observed that the average Nu and the heat transfer rate increase with an increase in the Ra. On the other hand, the average Nu first increases and then reduces with an increase in L/D. On the contrary, the heat transfer rate decreases monotonically with an increase in the L/D. The suction of fresh air into the funnel increases with Ra, whereas it reduces with an increase in L/D. The perforated funnels have better heat dissipation capacity than the unperforated ones.

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Modeling two-phase gas-solid flow in axisymmetric diffusers using cut cell technique: an Eulerian-Eulerian approach

Salem,

Elreafay,

Abumandour

et al. 2024

Bound Value Probl

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Axisymmetric diffusers find wide applications in various industrial processes, including combustion systems, pneumatic conveying, and fluidized bed reactors. Understanding and accurately modeling the behavior of two-phase flows in these devices are critical for optimizing their performance and efficiency. Various aspects of the two-phase gas-solid flow, including particle-particle and particle-wall interactions, interphase momentum transfer, and phase segregation, are investigated. Our currently developed technique, which uses a cut-cell technique, is an established new method to handle the inclined wall of an axisymmetric diffuser. The near-wall cells are treated as five faces for the new grid; one is the inclined wall. This helps treat the boundary condition at the wall in an accurate physical way. The code FORTRAN, developed in-house, was used to solve the axisymmetric diffuser using a cut-cell technique. The results of this study will provide valuable insights into the behavior of gas-solid two-phase flows in axisymmetric diffuser. A parametric study of the impact of particles diameters ($100,\ 200,\ \text{and} \ 300\mu m$ 100 , 200 , and 300 μ m ), the solid volume loading ratios $(0.005,\ 0.008,\ 0.01)$ ( 0.005 , 0.008 , 0.01 ) , and cant angle $(4.5^{\circ},\ 7^{\circ},\ 9.5^{\circ}) $ ( 4.5 ∘ , 7 ∘ , 9.5 ∘ ) effect of axisymmetric diffuser on the local skin friction, pressure, velocity, turbulent kinetic energy, and separation zone.

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Dilute gas‐particle suspension in a diffuser: A two‐fluid modelling approach

Cited by 3 publications

References 45 publications

Modeling Two-Phase Gas-Solid Flow in Axisymmetric Diffusers using Cut Cell Technique: An Eulerian-Eulerian Approach

Modeling Two-Phase Gas-Solid Flow in Axisymmetric Diffusers using Cut Cell Technique: An Eulerian-Eulerian Approach

Cooling Characteristic of an Infrared Suppression Device With Single Perforated Funnel: A Computational Fluid Dynamics Approach

Modeling two-phase gas-solid flow in axisymmetric diffusers using cut cell technique: an Eulerian-Eulerian approach

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