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On the thermodynamics of angular propulsion
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In this article, the thermodynamics of angular propulsion was presented and a theoretical model of the energy transfer was proposed, which leads to the most basic element of a radial inflow device.Abstract:
In a recently published article by Polihronov and Straatman (Phys. Rev. Letters 109, 054504, 2012), the thermodynamics of angular propulsion was presented and a theoretical model of the energy transfer was proposed. This article will show that the theoretical model leads to the most basic element of a radial inflow device. It is shown that Euler's work equation reduces to the same theoretical result for this case. The system is then studied as a self-governed device moving in a medium posing external resistance. It is observed that the output power from the device exhibits a peak at a certain characteristic value of its peripheral velocity. In the presence of resistance or loading, the system has motion, characterized by the requirement of pre-rotation exhibiting maximum power output and a terminal state. The points of equilibrium and operational thresholds of the motion are discussed, accompanied by a theoretical model of the presented dynamical system. The presented angular propulsion theory is then utilized to provide better understanding of phenomena taking place in vortex tubes.read more
Citations
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Journal ArticleDOI
The maximum coefficient of performance (COP) of vortex tubes
TL;DR: In a number of recent publications, it has been shown that the vortex tube effect occurs as a result of the extraction of work from a radial inflow of rotating gas as discussed by the authors.
The Maximum COP of Vortex Tubes
TL;DR: In this paper, the maximum theoretical value of the vortex tube effect is 2.5, which can reach over 15.0 for common refrigerants and 20.0 or higher for other gases (e.g. n-heptane).
References
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Book
Fluid mechanics, thermodynamics of turbomachinery
TL;DR: The Fluid Mechanics and Thermodynamics of Turbomachines (FLMTH) as discussed by the authors is a classic text in the field of turbomachines, which has been used as a core text in both undergraduate and graduate level courses.
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The use of the expansion of gases in a centrifugal field as cooling process.
TL;DR: The design of a vortex tube of good efficiency in which the expansion of a gas in a centrifugal field produces cold is described and the important variables in construction and operation are discussed and data for several tubes under various operating conditions are given.
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A critical review of temperature separation in a vortex tube
TL;DR: In this paper, a critical review of current explanations on the working concept of a vortex tube is presented, and hypotheses of pressure, viscosity, turbulence, temperature, secondary circulation and acoustic streaming are discussed.
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Analysis of the flow and energy separation in a turbulent vortex
Robert G. Deissler,M. Perlmutter +1 more
TL;DR: In this paper, an analysis of the velocity, temperature and pressure distributions in a turbulent vortex with radial and axial flow is made, where the vortex is divided into a core and an annular region with a different uniform axial mass velocity.
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The Ranque effect
TL;DR: In this article, a new approach to the vortex effect is proposed, which provides a unified explanation of all the experimental data available, and the existing theories of the Ranque effect are reviewed and their inherent inconsistencies in the interpretation of some experimental data discussed.