The vortex tube effect without walls

Abstract

In a recent publication (J. Polihronov and A. Straatman, Phys. Rev. Lett. 109, 054504, 2012) it was proposed that rotational cooling is due to angular propulsion. While this fact is obscured in a traditional shrouded vortex tube, it is clearly visible when the vortex tube effect is demonstrated without confining walls. It is thus established that the shrouded vortex tube behaves as a rotorless turboexpander, cogenerating both cold and hot gas. The physics of the turboexpander, the shrouded vortex tube and the vortex without walls is shown to be governed by Eulers turbine equation. It is also concluded that propulsion generating vortices can exist without supporting or confining structures.Résumé : In a recent publication (J. Polihronov and A. Straatman, Phys. Rev. Lett. 109, 054504, 2012) it was proposed that rotational cooling is due to angular propulsion. While this fact is obscured in a traditional shrouded vortex tube, it is clearly visible when the vortex tube effect is demonstrated without confining walls. It is thus established that the shrouded vortex tube behaves as a rotorless turboexpander, cogenerating both cold and hot gas. It is also concluded that propulsion generating vortices can exist without supporting or confining structures.

Real-time automated composite scanning using forced cooling infrared thermography

“…Reviewing the illustration, air propagates down the length of the tube, with parcels of air travelling to a specific distance from the axis dependent on their internal energy (thermal energy) to maintain the enthalpic gradient [27]. With heat transfer occurring between forward warm flow and returning cold flow for the length of the tube [31]. In this work the VT is used to provide cooling to the surface of the inspected samples, which can be controlled directly by adjusting the input air pressure and control valve.…”

3D Numerical Investigating of Flow Field and Energy Separation in Counter-flow Vortex Tube

“…The separation mechanism inside the vortex tube has not completely understood until today [9]. Recent work by Polihronov and Straatman [10,11] proposed that the temperature separation (rotational cooling) is due to angular propulsion. Vortex tube is covered extensively in literatures through experimental and numerical analysis.…”