Numerical analysis on the heat and work transfer due to shear in a hot cascade Ranque–Hilsch vortex tube |
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| Affiliation: | 1. Mechanical Engineering Department, Faculty of Engineering, Alexandria University, Egypt;2. Mechatronics Engineering Department, German University in Cairo, Egypt;1. Faculty of Mechanical Engineering, Semnan University, P.O. Box: 35131-19111, Semnan, Iran;2. Department of Mechanical Engineering, Faculty of Engineering and Architecture, Selcuk University, Selcuklu, 42031 Konya, Turkey;3. Center for Clean Energy Engineering, University of Connecticut, 44 Weaver Rd., Unit 5233, Storrs, CT 06269, USA;4. Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA |
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| Abstract: | Cascading of vortex tubes is a possible implementation to extract significantly larger amount of useful work. A hot cascade-type RHVT makes use of the cold gas for cooling purposes while improving the heating capacity of the hot gas. In a vortex tube inflow pressure is the only source of energy which converts into thermal energy. The conversion of pressure energy into thermal energy is associated with the heat and work transfer due to shear along the radial, axial and tangential directions. In this paper, the physics of fluid flow and thermal separation are studied based on the heat and work transfer due to shear along all three directions. The work transfer due to the action of tangential shear is always from the cold to hot fluid layers and is the most dominant factor in the thermal separation process. The contribution increases considerably with hot cascading. However, the process of thermal separation degrades due to the effect of sensible heat transfer. |
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