Thermodynamics of Angular Propulsion in Fluids

Polihronov, Jeliazko G.; Straatman, Anthony G.

doi:10.1103/physrevlett.109.054504

Cited by 27 publications

(21 citation statements)

References 3 publications

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“…Items (i) and (ii) were already presented in [4]. Herein we show that vortex tube air flow complies with the law of temperature separation proposed in [4].…”

supporting

confidence: 77%

“…Herein we show that vortex tube air flow complies with the law of temperature separation proposed in [4]. We achieve this by demonstrating the vortex tube effect without confining walls.…”

supporting

confidence: 57%

“…Therefore, the total temperature of the flow exhibits a symmetric rise and drop with respect to T ∞ , because the inlet moves with absolute velocity c while the absolute flow velocity of the outlet is zero, as presented in detail in [4].…”

mentioning

confidence: 93%

“…The Vortex Tube Effect Without Walls.-The effect of temperature separation in the elemental system of Figure 1 was closely reproduced by flow simulations [4] with the computational fluid dynamics (CFD) package Fluent [8]. Here we utilize the same CFD package and the same modeling approach to demostrate temperature separation in vortices.…”

mentioning

confidence: 96%

“…The rudimentary flow system shown in Figure 1 exhibits temperature separation as a manifestation of fundamental law: in the case of rectilinear motion, it is the result of the conservation of enthalpy; in the case of rotation, it is the result of the conservation of rotational enthalpy, or rothalpy. In both cases, the upper limit of the (total) temperature separation as observed in the stationary frame of reference F is given by [4] …”

mentioning

confidence: 99%

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The vortex tube effect without walls

Polihronov

Straatman

2015

Can. J. Phys.

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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.

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“…Items (i) and (ii) were already presented in [4]. Herein we show that vortex tube air flow complies with the law of temperature separation proposed in [4].…”

supporting

confidence: 77%

“…Herein we show that vortex tube air flow complies with the law of temperature separation proposed in [4]. We achieve this by demonstrating the vortex tube effect without confining walls.…”

supporting

confidence: 57%

mentioning

confidence: 93%

mentioning

confidence: 96%

mentioning

confidence: 99%

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