Observation of large-scale hydrodynamic structures in a vortex tube and the Ranque effect

Арбузов, В. Л.; Dubnishchev, Yu. N.; Лебедев, А. В.; Pravdina, M. Kh.; Yavorski, N. I.

doi:10.1134/1.1261939

Cited by 47 publications

(31 citation statements)

References 2 publications

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“…Different understandings of the internal flow mechanisms and explanations for the energy separation within the vortex tube, which have been reviewed and analysed in recent publications [19][20][21][22], imply the lack of general consensus and the requirement of clarification of the complex separating phenomenon. The internal pressure gradient has been proposed as the dominating factor for the energy separation phenomenon within a vortex tube [14,[23][24][25][26]. Ranque proposed that compression and expansion effects are the main reasons for the temperature separation in the tube [7,27].…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

The Expansion Process in a Counter-flow Vortex Tube

2015

J Vortex Sci Technol

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“…Systematic and detailed experiments are now strongly needed for verification of theoretical models, the techniques being preferable that do not or just slightly disturb the flow. So, the use of optical diagnostic has allowed a considerable progress in the study of inside swirling flow [2][3][4][5]. In [2] by means of Gilbert optics the existence of a large-scale vortex structure in the form of a double spiral in the field of optical phase density was for the first time diagnosed.…”

mentioning

confidence: 99%

“…So, the use of optical diagnostic has allowed a considerable progress in the study of inside swirling flow [2][3][4][5]. In [2] by means of Gilbert optics the existence of a large-scale vortex structure in the form of a double spiral in the field of optical phase density was for the first time diagnosed. The spiral arises on a plane end cover at the hot exit and propagates along the axis in the cold exit direction.…”

mentioning

confidence: 99%

“…The sufficient nonstationarity of temperature and velocity was showed. While in [5] a circular tube is investigated, in [2][3][4] the tube was studied with square cross section all along for the convenience and delicacy of optical diagnostic. It was found that in spite of such a modernization the Ranque effect is distinctly manifested though the tube does not show any record features.…”

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confidence: 99%

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Comparing Ranque tubes of circular and square cross section

et al. 2017

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Abstract. The efficiency of temperature end energy separation is compared for Ranque tubes of circular and square cross section, with the square side equal to the circle diameter. The "square" tube demonstrates approximately two times less efficiency, yet the separation effect still being evidently presented.Experimental study of the vortex effect efficiency in Ranque-Hilsh tubes is presented. The insufficience of the available experimental data and theoretical approaches to the understanding of processes inside a vortex tube are well-known [1]. Systematic and detailed experiments are now strongly needed for verification of theoretical models, the techniques being preferable that do not or just slightly disturb the flow. So, the use of optical diagnostic has allowed a considerable progress in the study of inside swirling flow [2][3][4][5]. In [2] by means of Gilbert optics the existence of a large-scale vortex structure in the form of a double spiral in the field of optical phase density was for the first time diagnosed. The spiral arises on a plane end cover at the hot exit and propagates along the axis in the cold exit direction. In [3][4] an attempt was made to diagnose this structure by means of LDA. The sufficient nonstationarity of temperature and velocity was showed. While in [5] a circular tube is investigated, in [2-4] the tube was studied with square cross section all along for the convenience and delicacy of optical diagnostic. It was found that in spite of such a modernization the Ranque effect is distinctly manifested though the tube does not show any record features.At this stage, the authors proceed to investigate the velocity fields inside the same tube by means of optical field diagnostic -PIV [6]. At that the first step is a detailed investigation of tube efficiency in a wide region of regime parameters for the square tube and comparison of results with a circular tube with the diameter defined as that of inscribed circle.It should be noted that a significant amount of new publications has appeared in recent times with detailed description of certain vortex tube designs and corresponding efficiencies, such as, for example, [7][8]. The data is supposed to help not only to optimize the technical use but also to verify theoretical models. In our case the detailed data is needed as a road map guiding the field measurements inside the tube.

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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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Observation of large-scale hydrodynamic structures in a vortex tube and the Ranque effect

Cited by 47 publications

References 2 publications

The Expansion Process in a Counter-flow Vortex Tube

The Expansion Process in a Counter-flow Vortex Tube

Comparing Ranque tubes of circular and square cross section

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

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