Numerical study of energy separation in a vortex tube with different RANS models

Baghdad, Mohammed; Ouadha, Ahmed; Imine, Omar; Addad, Yacine

doi:10.1016/j.ijthermalsci.2011.07.011

Cited by 62 publications

(15 citation statements)

References 29 publications

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“…On the other hand, another, forced, vortex is formed in the core, in which swirl velocity values decrease as we move towards the centerline of working tube. The results of Fig 10 and 11 are in good coordination with the observations of Kurosaka [4], Gutsol [17]. The upper Figures are drawn at two section of working tube and describe the tangential velocity pattern inside the working tube whereas the swirl velocity inside the vortexchamber has different pattern.…”

Section: Swirl (Tangential) Velocitysupporting

confidence: 82%

“…Researches on the vortex tube air separators has a long history, however, we explain a brief list of important works as follow: The heat and mass transfer between the cold and hot cores (inside the vortex tube) is analyzed by Rafiee and sadeghiazad [3]. The capabilities of different turbulence models (the RSM, LES, k-ω, k-ɛ and SST k-ω) for predicting the flow structures within the air separator were examined by Baghdad et al [4] and Rafiee and Sadeghiazad [5]. Some variations in the temperature drops are seen when a bended main tube is used in the structure of the air separator.…”

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional CFD Simulation of Fluid Flow inside a Vortex Tube on Basis of an Experimental Model- The Optimization of Vortex Chamber Radius

Rafiee¹,

Mohammadkhani²

2016

IJHT

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Vortex-chamber is a main part of vortex tube which the pressured gas is injected into this part tangentially. An appropriate design of vortex-chamber geometry leads to better efficiency and good vortex tube performance. In this study, the computational fluid dynamics (CFD) model is created on basis of an experimental model and is a three-dimensional (3D) steady compressible model that utilizes the k-ε turbulent model. In this paper the effect of changing radius of vortex-chamber (R * ) on vortex tube performance has been studied for different value of R * and the optimized radius of vortex-chamber has been determined. According to numerical results the cold temperature difference has increased when we take into account the effect of the radius of vortex-chamber in range of 5.7-11 mm and when the radius of vortex chamber has located in range of 11-13 mm, the cold temperature difference has decreased. The highest ΔTc is 46.77 K for R * =11 mm at a cold mass fraction of 0.3, higher than basic model around 6.3% at the same cold flow fraction. Finally, the results obtained, particularly the temperature values, are compared with some available experimental data, which show good agreement.

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Section: Swirl (Tangential) Velocitysupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Three-Dimensional CFD Simulation of Fluid Flow inside a Vortex Tube on Basis of an Experimental Model- The Optimization of Vortex Chamber Radius

Rafiee¹,

Mohammadkhani²

2016

IJHT

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“…The distinction between experimental results and the numerical model was smallest using k-ε Realizable and RSM models. Similar studies with similar results were conducted by Baghdad [16] and Dutta [17], but with different criteria for choosing the appropriate turbulent model.…”

Section: Introductionsupporting

confidence: 60%

Vortex Tube: A Comparison of Experimental and CFD Analysis Featuring Different RANS Models

2018

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Abstract. The Ranque-Hilsch vortex tube represents a device for both cooling and heating applications. It uses compressed gas as drive medium. The temperature separation is affected by fluid flow behaviour inside the tube. It has not been sufficiently examined in detail yet and has the potential for further investigation. The aim of this paper is to compare results of numerical simulations of the vortex tube with obtained experimental data. The numerical study was using computational fluid dynamics (CFD), namely computational code STAR-CCM+. For the numerical study, a threedimensional geometry model, and various turbulence physics models were used. For the validation of carried out calculations, an experimental device of the vortex tube of identical geometrical and operating conditions was created and tested. The numerical simulation results have been obtained for five different turbulence models, namely Standard k-ε, Realizable k-ε, Standard k-ω, SST k-ω and Reynolds stress model (RSM), were compared with experimental results. The most important evaluation factor was the temperature field in the vortex tube. All named models of turbulence were able to predict the general flow behaviour in the vortex tube with satisfactory precision. Standard k-ε turbulence model predicted temperature distribution in the best accordance with the obtained experimental data.

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“…Researches on the vortex tube air separators has a long history, however, we explain a brief list of important works as follow: The NIST real gas model (as a CFD model) was used to investigate the flow pattern inside the air separator by Dutta et al [3]. The capabilities of different turbulence models (the RSM, LES, k-ω, k-ɛ and SST k-ω) for predicting the flow structures within the air separator were examined by Baghdad et al [4] and Rafiee and Sadeghiazad [5]. Some variations in the temperature drops are seen when a bended main tube is used in the structure of the air separator.…”

Section: Figure 1 Schematic Diagram Of a Vortex Tube With Flow Direcmentioning

confidence: 99%

Heat and Mass Transfer Between Cold and Hot Vortex Cores inside Ranque-Hilsch Vortex Tube-Optimization of Hot Tube Length

Rafiee¹,

Mohammadkhani²

2016

IJHT

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This research describes numerical investigations on the impacts of length of main (hot) tube (95 to 125 mm) and type of the boundary condition on the thermal capability (heating and cooling) of the vortex tube and the heat and mass transfer between the cold and hot vortex cores inside a Ranque-Hilsch vortex tube applying the 3D CFD models. The cooling and heating capabilities increase severely with an increase in the main tube length upto 115mm (optimum value) and beyond L=115mm the thermal effectiveness of vortex tube decreases. The results have been compared to the experimental values with good agreement (less than 7 %).

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Numerical study of energy separation in a vortex tube with different RANS models

Cited by 62 publications

References 29 publications

Three-Dimensional CFD Simulation of Fluid Flow inside a Vortex Tube on Basis of an Experimental Model- The Optimization of Vortex Chamber Radius

Three-Dimensional CFD Simulation of Fluid Flow inside a Vortex Tube on Basis of an Experimental Model- The Optimization of Vortex Chamber Radius

Vortex Tube: A Comparison of Experimental and CFD Analysis Featuring Different RANS Models

Heat and Mass Transfer Between Cold and Hot Vortex Cores inside Ranque-Hilsch Vortex Tube-Optimization of Hot Tube Length

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