Journal ArticleDOI
A new vortex method of plasma insulation and explanation of the Ranque effect
Alexander Gutsol,Jon Arne Bakken +1 more
TLDR
In this paper, a new simple explanation of the Ranque effect of energy separation in the vortex tube is proposed, which takes place due to radial motion of turbulent micro-volumes with differing tangential velocities in the strong centrifugal field.Abstract:
The efficiency of thermal insulation of a microwave-generated plasma using reverse vortex flow was investigated experimentally and by numerical simulations. Comparison with the conventional vortex method of plasma insulation was made. Changing the location of the vortex inlet to the exit end of the plasma torch leads to a significant decrease of the heat loss to the wall; from 30% to 5%. This result contradicts the traditional explanation of the Ranque effect. A new simple explanation of the Ranque effect of energy separation in the vortex tube is proposed. Energy separation takes place due to radial motion of turbulent micro-volumes with differing tangential velocities in the strong centrifugal field. The new model of energy separation explains such apparently mysterious phenomena as the counter-rotation of the central vortex flow layers observed in some experiments and in numerical simulations. A new approach for consideration of the confined vortex flows is described.read more
Citations
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Journal ArticleDOI
Non-thermal atmospheric pressure discharges
TL;DR: In this paper, the four most important and widely used varieties of non-thermal discharges: corona, dielectric barrier, gliding arc and spark discharge are discussed.
Journal ArticleDOI
Review of Ranque–Hilsch effects in vortex tubes
TL;DR: In this article, the authors present an overview of the phenomena occurring inside the vortex tube during the temperature/energy separation on both the counter flow and parallel flow types, and present several different hypotheses based on experimental, analytical, and numerical studies.
Journal ArticleDOI
Dissociation of CO 2 in a low current gliding arc plasmatron
Thomas Nunnally,Kirill Gutsol,Alexander Rabinovich,Alexander Fridman,Alexander Gutsol,A. Kemoun +5 more
TL;DR: In this article, the authors studied the process of CO2 dissociation in a non-equilibrium gliding arc plasmatron (GAP), which was designed not only for efficient reforming but also to ensure significant variability of reactor parameters.
Journal ArticleDOI
Gliding arc discharges as a source of intermediate plasma for methane partial oxidation
TL;DR: In this paper, an experimental study of intermediate plasma catalyzed partial oxidation of methane is completed and results along with numerical simulations are presented along with the best plasma parameters for industrial chemical applications like partial oxidation.
Journal ArticleDOI
An experimental study on the design parameters of a counterflow vortex tube
Orhan Aydin,Muzaffer Baki +1 more
TL;DR: In this paper, the design parameters and performances of counterflow vortex tubes are investigated under different inlet pressures, and the thermal performance as a function of the following geometrical parameters is studied: the length of the vortex tube, the diameter of the inlet nozzle and the angle of the control valve.
References
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Journal ArticleDOI
Jet flames in rotating flow fields
TL;DR: In this article, Schlieren photographs, together with velocity and turbulence measurements in an isothermal model, show that mixing and entrainment are considerably reduced and that turbulence is damped over the major portion of the flame length.