Evaluating velocity and temperature fields for Ranque–Hilsch vortex tube using numerical simulation

Alsaghir, Ahmad M.; Hamdan, Mohammad O.; Orhan, Mehmet F.

doi:10.1016/j.ijft.2021.100074

Cited by 18 publications

(8 citation statements)

References 31 publications

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“…The second one is the free vortex where velocity decrease with radius. This finding matches with [6] who showed the detailed velocity profile of each vortex. Regarding the physical properties, they are nondimensionalized based on the values of air properties provided in Fig.…”

Section: Resultssupporting

confidence: 91%

“…Since the main focus of this work is to examine the behavior of energy separation for different gases, the study examined only one axial location ( z∕L ). The flow behavior at different axial locations has been examined in different places in literature [6]. In more details, the impact of the MW is clearly observed from ideal gas equation in Eq.…”

Section: Resultsmentioning

confidence: 99%

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Fluid properties impact on energy separation in Ranque–Hilsch vortex tube

2022

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This paper examines the energy separation in vortex tubes which is a passive device that can split a pressurized room temperature gas stream to hot and cold streams. The paper employs numerical simulations to investigate the impact of various working fluids such as helium, air, oxygen, nitrogen, and carbon dioxide on the energy separation in the vortex tube, using the SST $$k{-}\omega$$ k - ω turbulence model with viscous heating. A three-dimensional numerical investigation is sued to examine the effect of a single fluid property on vortex tube performance, while keeping the rest of the fluid properties unchanged, which is impossible to achieve via experimental study. The numerical investigation examines the influence of molecular weight, heat capacity, thermal conductivity, and dynamic viscosity on energy separation. The results show that energy separation performance improves with lower molecular weight and heat capacity, and higher dynamic viscosity of the working fluids, while no impact of the thermal conductivity is observed. Out of five gases tested in this study, helium has yielded the maximum temperature separation, while carbon dioxide has yielded the lowest performance. Results show that viscous dissipation contributes to the temperature separation in vortex tube.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Fluid properties impact on energy separation in Ranque–Hilsch vortex tube

2022

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“…Investigation of open literature found [14][15][16] , Standard turbulence model better reflects the energy separation characteristics of the vortex tube and the distribution of the internal pressure field, temperature field, velocity field, so the Standard turbulence model is used for the numerical simulation of the vortex tube. The numerical simulation uses ideal air as the working gas, the pressure solver, the flow equations are chosen to discretize the control equations in the second-order windward format, and the SIMPLEC algorithm is chosen to calculate the pressure-velocity coupling.…”

Section: Figure5grid Independence Verificationmentioning

confidence: 99%

Analysis of the influence of pipe materials on the energy separation effect of vortex tubes

Han,

Huang

2024

Preprint

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The basic objective of studying vortex tubes using CFD simulations is to improve efficiency and performance by selecting the right material for manufacturing vortex tubes under suitable conditions. In this paper, numerical simulations are carried out to analyze the counter flow vortex tube with different materials. Compressed air is used as the work mass with an inlet pressure of 0.1mpa to 0.5mpa and the materials used are copper, aluminum, steel, PVC, and wood. The cold mass fraction was kept at 0.1, and the L/D of the vortex tube was taken as 16. The Standard k-ε model was used to perform steady-state numerical simulations of the gas flow inside the vortex tube, and the trends of velocity, pressure, and temperature variations under different materials, pressures, and roughness conditions were obtained. Finally, after evaluating all the simulated values for the properties of the five materials, depending on their physical properties, the vortex tube as a metallic material has a higher temperature gradient than the non-metallic materials in the order from copper - aluminum - steel - PVC - wood.

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“…They reveal that cooling energy increase by 10.47% with PA6 material compared to aluminium. The numerical studies have been performed on the VT for velocity and temperature field by A.M.AlSaghir et al [12] and found forced and free vortex locations. There also conclude that how mass fraction rate influences the VT thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Computational study for the optimization of Ranque-Hilsch vortex tube with the variation of number of inlet chamber and distance between the chambers

Singh

Pramanick

Rana

2022

J. Phys.: Conf. Ser.

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The purpose of the present study is to analyse the improvement in the performance of vortex tubes numerically. The air is taken as the working fluid in the compressible, axisymmetric 3-D, turbulent flow, and steady-state vortex tube. The standard k-ɛ turbulent model has been used for flow simulation in ANSYS FLUENT software with different pressure at the inlet and validated with experimental outcomes. It is found that there is an increment of 9.09 % in the cold temperature gradient with three inlet chambers as compared to single chamber. When inlet chamber numbers change from three to four, a decrease in the cold temperature gradient is recorded. When the distance between the inlet chamber increases from 8 mm to 32 mm, there is a decrease in the vortex tube’s cold temperature gradient. Therefore, it indicates that the optimum number of inlet chambers to obtain maximum cold temperature gradient, i.e., minimum cold exit temperature for the given specification of the vortex tube essential to have three inlet chambers, and the optimum distance between the inlet chambers 8 mm, is recommended.

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Evaluating velocity and temperature fields for Ranque–Hilsch vortex tube using numerical simulation

Cited by 18 publications

References 31 publications

Fluid properties impact on energy separation in Ranque–Hilsch vortex tube

Fluid properties impact on energy separation in Ranque–Hilsch vortex tube

Analysis of the influence of pipe materials on the energy separation effect of vortex tubes

Computational study for the optimization of Ranque-Hilsch vortex tube with the variation of number of inlet chamber and distance between the chambers

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