An investigation of energy separation in a vortex tube

Stephan, Karl; Song, Lin; Durst, M.; Huang, Feng; Seher, D.

doi:10.1016/0017-9310(83)90038-8

Cited by 164 publications

(85 citation statements)

References 7 publications

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“…However, it is an observation that at highest cold end temperature drop the tube performance significantly reduces, the reason behind drop in performance is the lower CMF obtained. A correlation proposed by Hilsch (Hilsch, 1947) The correlation proposed by Stephan and Lin (Stephen, Lin, Durst, Huang, & Seher, 1983) was,…”

Section: Effect Of Cold Mass Fraction (Cmf)mentioning

confidence: 99%

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Parametric Review of Ranque-Hilsch Vortex Tube

Devade¹,

Pise²

2017

AJHMT

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Vortex tube is the device that separates pressurized fluid into hot and cold fluid streams simultaneously. The scientific community has done extensive experimental and theoretical studies since invention of vortex tube to augment the performance of the tube by varying geometrical and operational parameters; the paper deals with parametric review of all such work. The review takes into account effect of almost 14 parameters on performance of vortex tube. It includes developments in tube geometry like L/D ratio, number of nozzles; hot end valve angle and cold orifice diameter etc. are discussed along with different fluids and operational parameters like CMF and stagnation point etc. The focus of most of the theoretical and experimental studies was to investigate mechanism of thermal separation and geometry optimization. The main objective of this review is to discuss efforts made in order to enhance the refrigeration effect so that, missing links could help for future research.

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Section: Effect Of Cold Mass Fraction (Cmf)mentioning

confidence: 99%

“…3 pp. 115-145 134 Stephan and Lin (Stephen, Lin, Durst, Huang, & Seher, 1983) mentioned that the variation in wall temperature could help to locate the stagnation point on axis. Fulton (Fulton, 1950) has observed that beyond the stagnation point (region close to hot end), axial velocity varies with radius i.e.…”

Section: Effect Of Stagnation Pointmentioning

confidence: 99%

Parametric Review of Ranque-Hilsch Vortex Tube

Devade¹,

Pise²

2017

AJHMT

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“…Kurosaka 3 stated that the temperature separation is a result of the acoustic streaming effect. Stephan et al 4 maintained that Gortler vortices form on the inside wall of the tube and drives the fluid motion. An imbedded secondary circulation was discussed by Ahlborn & Gordon.…”

Section: Open Accessmentioning

confidence: 99%

“…Stephan et al 4 carried out an approximate investigation for geometrically similar vortex tubes with straight nozzles and reported that the ratio of the actual temperature drop of the cold gas that exits from the exhaust to the maximum temperature difference(ΔT c /ΔT c,max ) can be defined as a function of cold mass fraction as below: To confirm the similar relation for our vortex tube with convergent main tube, results by Hilsch, 2 Stephan et al 4 and Rafiee & Rahimi 24 are applied to compare and the results of this comparison is presented in Figure 13. In addition, the flow patterns as path lines at sectional lengths near the cold and hot exits also the middle region are shown in Figure 14.…”

Section: The Effect Of Convergent Hot Tubementioning

confidence: 99%

CFD Analysis of Temperature Separation in a Convergent Vortex Tube

Rashidzadeh¹

2016

IPCSE

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The purpose of this paper is to investigate the effect of using a convergent hot tube on the vortex tube refrigeration capacity. The computational fluid dynamics (CFD) model used is a three-dimensional steady compressible model that utilizes the k-ɛ turbulence model. In this numerical research, different convergence angles of the hot tube (β=0°, 0.5°, 0.88°, 1°, 1.5°, and 2°) have been considered to analyze the vortex tube performance. The results showed that as the angle converges from the cylindrical model (β=0°), the cold temperature separation improves at the cold mass fractions greater than about 0.3, but increasing the angle more than 2° impairs the cold temperature separations compared to the cylindrical model, because of the secondary circulation development inside the vortex tube. Also, a successful validation has been carried out between some available experimental results and the present numerical model (for cylindrical vortex tube) IntroductionThe vortex tube is a simple device, without any moving parts, that separates a pressurized flow of air (or any inlet gas) into hot and cold streams. Compressed air enters tangentially into the vortex chamber, where it splits into two lower pressure streams, the peripheral and the inner vortexes. The hot stream rotates near the outer radiuses (near the wall) while the cold stream flows at the center of the tube. The hot outer layers of the compressed gas escape through the conical valve side at the end of the tube. The remaining gas returns in an inner vortex and leaves through the cold exit orifice located at the other end of the tube near the inlets. This behavior is schematically illustrated in Figure 1. There are various explanations for this behavior happened in the vortex tubes. One explanation is that, owing to centrifugal force, the outer air is under higher pressure than the inner air. So, the temperature of the outer layers is higher than that of the inner layers. Another explanation is that as both vortices have the same angular velocity and direction, the inner vortex loses angular momentum.

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“…Kassner and Knoernschild [3] performed a theoretical study based on the assumption that the effect was due to adiabatic expansion, which led to a low temperature in the low pressure area near the axis of the tube. Subsequently, other researchers have proposed different theories to explain the energy separation process, some of the most important referenced in chronological order are: Webster [4], Fulton [5], Sheper [6], Harnett et al [7], Lay [8,9], Deissler et al [10], Reynolds [11], Lewellen [12], Lindstrom [13], Kurosaka [14], Amitani et al [15], Stephan et al [16], Arbuzov et al [17], Gutsol et al [18], Lewis et al [19], Ahlborn et al [20], Trofimov [21] and Colgate [22]. Notwithstanding these efforts, a theory which satisfactorily explains the entire process has not been developed yet.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of the Energy Performance of an Air Vortex Tube when the Inlet Parameters are Varied

Torrella¹,

Patiño²,

Sánchez³

et al. 2013

TOMEJ

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Abstract:The paper presents the analysis of the energy performance of an air vortex cooling tube under variations of the air inlet properties, with three independent experimental tests validated through the energy balance in the device.The experimental analysis includes the following variations of the input conditions: First, the effect of the air inlet pressure to the vortex tube, focused on the analysis of temperature variations in the output cold stream and in the cooling capacity when the cold flow fraction varies. Second, we studied air inlet temperature variations to the vortex tube under different cold flow fractions, which is an analysis not found in the literature. And finally, is studied the performance of the vortex tube when the insulation is provided or in absence of insulation.

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An investigation of energy separation in a vortex tube

Cited by 164 publications

References 7 publications

Parametric Review of Ranque-Hilsch Vortex Tube

Parametric Review of Ranque-Hilsch Vortex Tube

CFD Analysis of Temperature Separation in a Convergent Vortex Tube

Experimental Evaluation of the Energy Performance of an Air Vortex Tube when the Inlet Parameters are Varied

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