Regime Analysis in Ranque Tubes with Circular and Square Working Channels

The analysis of current complex experimental investigation of the vortex tube with square cross section is made focusing on the criticality of the inner flow in the framework of the flow crisis concept. The criticality condition is proved to take place in the vortex tube by operating with LDA obtained velocity experimental data. As the measured axial velocity exceeds the calculated velocity of centrifugal elastic waves on the boundary between the longitudinal circulation zone and the near wall swirling jet, two scenarios are supposed possible for the transition of the supercritical state to a subcritical one, similar to the vortex breakdown in a swirling jet at its discharge into the quiet liquid volume: the mild oscillations or a series of hydraulic jumps become possible, leading to a flow pattern choke change with the transformation to heat of excess kinetic energy.

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The Flow Crisis and an Inner Source of Heating in the Vortex Tube

Pravdina

Kabardin

Polyakova

et al. 2020

J. Phys.: Conf. Ser.

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Visualization in the Ranque-Hilsch vortex tube using high-speed video recording

Gordienko

Yavorskii

Pravdina

et al. 2021

J. Phys.: Conf. Ser.

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Visualisation via video recording was carryed out in a Ranque-Hilsch vortex tube with a square cross-section. Video files were captured at recording speeds from 1000 to 10 000 frames per second. The best video files were obtained at a shooting frequency of 7600 frames per second with an input pressure of 1 bar. The video confirmed the presence of a double helix in the flow core in the second section of the tube. The video files showed the presence of a circulation zone between the flow core and the periphery, which is constantly changing over time. It can be clearly seen the angle at which the particles move in the peripheral flow.

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LDA-based experimental study of flow crisis in the Ranque—Hilsch vortex tube

Kabardin

2023

Thermophys. Aeromech.

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Regime Analysis in Ranque Tubes with Circular and Square Working Channels

Cited by 6 publications

References 7 publications

The Flow Crisis and an Inner Source of Heating in the Vortex Tube

The Flow Crisis and an Inner Source of Heating in the Vortex Tube

Visualization in the Ranque-Hilsch vortex tube using high-speed video recording

LDA-based experimental study of flow crisis in the Ranque—Hilsch vortex tube

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