A new approach to study and optimize cooling performance of a Ranque–Hilsch vortex tube

Shamsoddini, Rahim; Khorasani, Ahmadreza Faghih

doi:10.1016/j.ijrefrig.2012.08.022

Cited by 18 publications

(7 citation statements)

References 23 publications

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“…A 25 mm extension is added to match the current model with their experimental set up, which was incorporated to allow temperature measurements. A similar extension was observed in Shamsoddini and Khorasani's [19] CFD work which was also based on Aljuwayhel et al's work. Five turbulence models (the standard k-ε model, the RNG k-ε model with swirl option, the RNG k-ε model without swirl option, the standard k-ω model, the SST k-ω model) are trialled as they have been identified as having the ability to produce a good match between simulated and experimental results [15,16,20,21] .…”

Section: Model Geometrysupporting

confidence: 84%

Numerical comparisons of the thermal behaviour of air and refrigerants in the vortex tube

Wang

Suen

2020

Applied Thermal Engineering

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Vortex tubes (VT), as a temperature separation device, have been widely used in open systems in which air is commonly used. When a VT is employed in a closed system, other working fluids could be considered. This paper numerically compares the thermal behaviour of air and two refrigerants (R134a and R600) in a VT under a range of operating conditions. It analyses their cooling and heating effect, the shear stress, flow streamlines patterns and temperature distributions. The results show that the refrigerants share certain similar trends with air: a higher VT inlet pressure leads to an increase in cooling effect that would reach a peak value when the chamber inlet/nozzle outlet velocity gets chocked. However, a larger VT pressure drop (between VT inlet and hot end) may result in a lower heating effect for refrigerants but not for air. A higher VT inlet pressure produces a larger pressure drop and this leads to a bigger temperature drop associated with the expansion process to partially or wholly cancel the temperature increase from the rotating process.

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Section: Model Geometrysupporting

confidence: 84%

Numerical comparisons of the thermal behaviour of air and refrigerants in the vortex tube

Wang

Suen

2020

Applied Thermal Engineering

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“…The increase of the system entropy in a vortex tube is mainly caused by the turbulent eddies in the central region of the tube. The turbulent flow behaviour has been reported in the investigations of the flow pattern in a vortex tube and was clearly shown by the turbulent intensity of the flow, particularly by the peak value of the intensity in the central area of the tube [1,41,46]. The increased entropy of the system also results in a loss of total energy, which has been noticed in previous investigations [18,31,35,36,42,45,[47][48][49][50].…”

Section: Discussionmentioning

confidence: 56%

The Expansion Process in a Counter-flow Vortex Tube

2015

J Vortex Sci Technol

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The process of temperature separation in a Ranque-Hilsch vortex tube is dependent on a multitude of factors, such as the pressure gradients, flow stagnation and mixture, energy transfer between different flow layers and heat transfer between the tube and the ambient air. The pressure gradient in an expansion process within a vortex tube has been proposed as the dominating reason for the temperature drop. However, at present, there is no general agreement within the research community for the expansion process itself, primarily due to the complexity of the internal flow conditions in the tube. Therefore, in the present article, a deeper insight into the separation mechanism within a vortex tube is presented, based on an analytical analysis using different expansion models, including isentropic expansion, free expansion and Joule-Thomson expansion. It was observed that the isentropic expansion is the only possible expansion process within a vortex tube. This was confirmed through comparison with experimental results obtained from different sources. The Expansion Process in a Counter

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“…Dincer et al [12] examined the effects of control valve angle on counter flow RHVT by using artificial neural networks and experimental data. Beside this, there are several studies on the cooling and heating performance of both streams of RHVT in which the performance change with the different parameters such as geometry and operating conditions of RHVT conducted [14][15][16][17][18][19][20][21][22][23][24]. Aydin and Baki [14] conducted an experimental study on the geometrical parameters and performance of counter flow RHVT.…”

Section: Introductionmentioning

confidence: 99%

The performance of vapor compression cooling system aided Ranque-Hilsch vortex tube

Acar¹,

Erbaş²,

Arslan³

2019

Therm sci

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In this paper, the Ranque-Hilsch vortex tube aided vapor compression cooling (RHVTC) system and single vapor compression cooling system were designed and evaluated by using energy, exergy, and economic analysis. The cooling systems were designed for three different evaporator temperature and different compressor discharge pressures which were available for refrigerants. The highest value of net present value of Ranque-Hilsch vortex tube system was calculated as 35836 €. The helical vortex generator of J-type, 1 st Ranque-Hilsch vortex tube body, control valve angle of 30°, 2 nd control valve opening position, R-143a were used in this Ranque-Hilsch vortex tube system and the operating conditions of this system were T1 of 277.15 K, P2 of 1700 kPa, and P8 of 601.325 kPa. For the same system, the COP was calculated as 0.0347 and 0.0409 while exergy efficiency was calculated as 0.0097 and 0.0079 for the summer and winter modes, respectively.

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A new approach to study and optimize cooling performance of a Ranque–Hilsch vortex tube

Cited by 18 publications

References 23 publications

Numerical comparisons of the thermal behaviour of air and refrigerants in the vortex tube

Numerical comparisons of the thermal behaviour of air and refrigerants in the vortex tube

The Expansion Process in a Counter-flow Vortex Tube

The performance of vapor compression cooling system aided Ranque-Hilsch vortex tube

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