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Viscous energy transfer in the boundary layer of the vortex tube

  • The vortex tube can separate a mass flow into a hot and cold mass flow. In this paper, the energy balance in the boundary layer of the vortex tube is analyzed with respect to a possible effect of temperature separation in the boundary layer by the viscous term of the enthalpy balance equation. A Large Eddy Simulation is used to generate the velocity profiles used for the computation of the viscous source terms. The dominant contributions of the source terms in the boundary layer of the vortex tube are identified and computed from the velocity fields. It is demonstrated how the strong velocity gradients in the boundary layer create a viscous flux of energy. An implementation of balance equations both with and without source term show the effect of energy separation in the boundary layer of the vortex tube.

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Author:Andre Kaufmann
Document Type:Working Paper
Date of Publication (online):2021/03/23
Date of first Publication:2021/03/26
Release Date:2021/03/26
Tag:boundary layer; energy separation; vortex tube
GND Keyword:Vortex-Rohr; Hilsch-Rohr; Boundary layer; Enthalpie
Page Number:18
Institutes:Hochschule Ravensburg-Weingarten
Licence (German):License LogoCreative Commons - CC BY-ND - Namensnennung - Keine Bearbeitungen 4.0 International