A comparison of the application of RSM and LES turbulence models in the numerical simulation of thermal and flow patterns in a double-circuit Ranque-Hilsch vortex tube

Bianco, Vincenzo; Khait, Anatoliy; Носков, А. С.; Алехин, В. Н.

doi:10.1016/j.applthermaleng.2016.06.095

Cited by 50 publications

(12 citation statements)

References 25 publications

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“…Computational studies using economical Reynolds-averaged Navier-Stokes (RANS) models generally suggested that the standard k − ε turbulence model gives better prediction [16,20]. More expensive LES-based simulations provided more insight on flow patterns [21,22].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Cryogenic Hydrogen Cooling in Vortex Tubes with Smooth Transitions

Matveev¹,

Leachman²

2021

Energies

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Improving efficiency of hydrogen cooling in cryogenic conditions is important for the wider applications of hydrogen energy systems. The approach investigated in this study is based on a Ranque-Hilsch vortex tube (RHVT) that generates temperature separation in a working fluid. The simplicity of RHVT is also a valuable characteristic for cryogenic systems. In the present work, novel shapes of RHVT are computationally investigated with the goal to raise efficiency of the cooling process. Specifically, a smooth transition is arranged between a vortex chamber, where compressed gas is injected, and the main tube with two exit ports at the tube ends. Flow simulations have been carried out using STAR-CCM+ software with the real-gas Redlich-Kwong model for hydrogen at temperatures near 70 K. It is determined that a vortex tube with a smooth transition of moderate size manifests about 7% improvement of the cooling efficiency when compared vortex tubes that use traditional vortex chambers with stepped transitions and a no-chamber setup with direct gas injection.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Cryogenic Hydrogen Cooling in Vortex Tubes with Smooth Transitions

Matveev¹,

Leachman²

2021

Energies

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“…The main purpose of the paper was to perform a detailed analysis of the thermal and flow patterns obtained with RSM-LRR and LES turbulence models. It was found that the LES turbulence model represented the qualitative turbulence of the flow better than the RSM-LRR model [4]. Zhao et al proposed a new method of soft abrasive rotary flow (SARF) polishing to solve the problem of ultra-precision polishing of K9 optical glass.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of polygonal spiral curved pipe with abrasive flow machining based on large eddy simulation

Liu¹,

Zhao²,

Dong³

et al. 2020

Vib. proced.

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Abrasive flow machining (AFM) technology can achieve precision machining finish for processing special curved pipe parts. In order to study the processing effect of abrasive flow machining for special curved pipe parts, polygonal spiral curved pipe is taken as the research object. The large eddy simulation (LES) method is used to simulate and numerically analyze the processing of polygonal spiral curved pipe. The static pressure cloud diagram, turbulence kinetic energy cloud diagram and turbulence intensity cloud diagram under different inlet pressures are obtained to analyze the influence of inlet pressure on the workpiece processed by abrasive flow. The fluid trace diagrams are obtained at the inlet and outlet of the workpiece, and the vortex changes of the fluid inside the workpiece are analyzed. The mechanism of vortex variation is revealed, which provides theoretical support for practical processing in the future.

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“…Both Ahlborn and Groves [2], and Xue and others [9] have suggested multiple re-circulation zones exist, each one behaving as a heat pump to move energy away from the core and towards the periphery. While earlier papers have provided mediocre evidence for this theory, more recent papers reporting the results of steady and unsteady, 3D, RANS and LES results have included streamline plots depicting multiple recirculation zones occurring within short vortex tubes [10], [11], [12], [13]. The re-circulation zones appear to be mobile and sensitive to geometry and boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

Energy Transfer Mechanisms In The Ranque-Hilsch Vortex Tube

Dyck¹,

Straatman²

2018

Progress in Canadian Mechanical Engineering

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The Ranque-Hilsch Vortex Tube (RHVT) is a small tube without any moving parts receiving compressed air from a tangential inlet and exhausting cold air from a small hole at one end of the tube while exhausting hot air from an annular exit at the opposite end. Nearly a century has passed since the RHVT was first patented, and the mechanism responsible for this socalled "temperature separation" remains unclear. The present work tests the hypothesis that kinetic energy is transferred from the stream of air leaving the cold exit to the air stream leaving the hot exit.To test the hypothesis, a parametric study using an axisymmetric model of the RHVT has been carried out using CFD software, wherein the pressure at the hot exit was varied. The study has been validated against previous experimental and computational models. The results show that the dominant mode of energy transfer between the two streams is work transfer, which supports the hypothesis.

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A comparison of the application of RSM and LES turbulence models in the numerical simulation of thermal and flow patterns in a double-circuit Ranque-Hilsch vortex tube

Cited by 50 publications

References 25 publications

Numerical Simulations of Cryogenic Hydrogen Cooling in Vortex Tubes with Smooth Transitions

Numerical Simulations of Cryogenic Hydrogen Cooling in Vortex Tubes with Smooth Transitions

Numerical simulation of polygonal spiral curved pipe with abrasive flow machining based on large eddy simulation

Energy Transfer Mechanisms In The Ranque-Hilsch Vortex Tube

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