CFD Simulation of Compressible Flow inside a Gas Centrifuge using OpenFOAM

Kulkarni, Harshawardhan

doi:10.22214/ijraset.2020.32496

IJRASET

2020

DOI: 10.22214/ijraset.2020.32496

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CFD Simulation of Compressible Flow inside a Gas Centrifuge using OpenFOAM

Harshawardhan Kulkarni¹

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2024

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Cited by 3 publications

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“…For purification of gases also adsorption is used to remove or recover solute gases. For regenerating adsorbents temperature and pressure methods are employed [13][14][15]. Investigations on intensifications of pressure swing adsorption are reported for optimization of cycle time and exploring possibilities of different low-cost adsorbents [16,17].…”

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confidence: 99%

Intensification of Temperature Swing Adsorption

Parkar¹,

Mulukh²,

Narhari³

et al. 2022

JSMPM

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Temperature swing adsorption (TSA) is an energy intensive process as it needs heat for regenerating the adsorbent bed. Beds are regenerated and saturated simultaneously and are used cyclically. While one bed is undergoing adsorption, other is regenerated and vice versa. Regeneration of bed can be carried out by changing pressure or temperature. Former is called pressure swing adsorption (PSA) and later TSA. Heat is supplied for regeneration to desorb the impurities. Temperature required to regenerate the gas is high. Cycle time can be reduced and the process can be intensified by facilitating faster heat transfer in the bed. Normally the heat transfer coefficient of the adsorbent material is low which affects the cycle time. Better heat transfer can be obtained by increasing the heat transfer through packing by adding metal wires, strips or composite materials. Thus, metal fillings with good conductivity can be used in the bed. Technologies like TEPSA (Thermally Enhanced Pressure Swing Absorption) and TPSA (Temperature Pressure Swing Absorption) are developed for air pre-purification. TEPSA is a PSA process and TPSA is a TSA process. TEPSA is improved by addition of heat while in TPSA, adsorbate is removed by unheated regeneration gas. It is possible to make 20-60% power savings by moving to a TPSA cycle compared to TSA system. TPSA reduces not only cost of vessel but also pipe work involved in process. TPSA has a major advantage which is, without decreasing cycle time, thermal energy can be saved. This article explores various methods for intensification of Temperature swing adsorption. By combining advantages of pressure and temperature swing adsorption, solution to the problem of high energy demand and cycle time can be obtained. Proper selection of adsorbent material can be helpful in building economic process. Selection of adsorbent materials is based on various factors like cross-sectional area, strength, chemical inertness, etc. of the adsorbents. For TSA, thermal properties of adsorbent materials become significantly important while selecting the adsorbent.

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mentioning

confidence: 99%

Intensification of Temperature Swing Adsorption

Parkar¹,

Mulukh²,

Narhari³

et al. 2022

JSMPM

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A new approach to calculating the drag force of the scoop in the gas centrifuge

Ghazanfari

Shadman

2023

Nuclear Engineering and Design

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Coupling molecular and continuum numerical methods for evaluation of thermal and mechanical drives on high rotating isotopic gas flow

Ebrahimgol,

Aghaie Moghanloo,

Zolfaghari

2024

Physics of Fluids

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The main objective of this study is to develop a hybrid molecular–continuum method to model a gas flow within a centrifuge machine. By implementation of this coupled approach, the effects of mechanical and thermal drives on gas flow and separation process inside a high rotating cylinder are evaluated. In simulating the gas flow inside the high rotating cylinder, there are certain situations where the particle density experiences significant fluctuations. To accurately simulate these events, the direct simulation Monte Carlo (DSMC) approach can be employed as the most effective particle method. However, obtaining a high level of accuracy with this method necessitates a significant amount of computation time. Alternatively, the less time-consuming computational approach, known as fluid technique or computational fluid dynamics (CFD), can be utilized when the flow is in the state of continuum. The goal of coupled DSMC–CFD solution is to integrate particle and fluid simulations to speed up calculation for transitional flows that involve both fields in a unified domain. The DSMC–CFD method is implemented in the OpenFOAM framework to simulate the flow of UF6 gas throughout the regions of a centrifuge machine. This open-source software offers the capability to solve the molecular region and code the coupling between the continuum and molecular regions. This work introduces a modified code based on OpenFOAM to simulate the gas flow in the supersonic rotating cylinder, which provides both molecular and fluid areas. This simulation is conducted under axisymmetric and steady-state to analyze the impact of thermal and mechanical drivers on flow regimes. Also, the isotopic separation and separative work are evaluated.

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CFD Simulation of Compressible Flow inside a Gas Centrifuge using OpenFOAM

Cited by 3 publications

References 14 publications

Intensification of Temperature Swing Adsorption

Intensification of Temperature Swing Adsorption

A new approach to calculating the drag force of the scoop in the gas centrifuge

Coupling molecular and continuum numerical methods for evaluation of thermal and mechanical drives on high rotating isotopic gas flow

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