tailieunhanh - Mass, energy, entropy and exergy rate balance in a ranque-hilsh vortex tube

The vortex tube is used to demonstrate the basics of the First and Second Law of Thermodynamics. In additon, this practcal laboratory program can even be used to make sense of one of the best-known theoretcal experiments in thermodynamics, the so-called Maxwell's demon experiment (Lewins & Bejan, 1999; Liew, Zeegers, Kuerten & Michalek, 2012). It should also be noted that once a compressed air source has been provided, the material needed to prepare the practcum is simple and affordable, and the lab itself is very interestng and appeals to students. | Journal of Technology and Science Education MASS, ENERGY, ENTROPY AND EXERGY RATE BALANCE IN A RANQUE-HILSH VORTEX TUBE Edorta Carrascal Lecumberri, José María Sala Lizarraga Department of Thermal Engineering. University of the Basque Country Received July 2013 Accepted September 2013 Abstract The objectve of this paper is to present a laboratory program designed for the Thermodynamics course offered in the Department of Thermal Engineering at the University of the Basque Country. With reference to one of the examples given in the textbook by Moran, Shapiro, Boettner and Bailey (2012), the balances of mass, energy, entropy and exergy are applied to a partcular control volume, and the ideal gas model is used. Using a Ranque-Hilsh vortex tube (Ranque, 1934), the division of a compressed air fow into two streams at a lower pressure is achieved: one hot stream, where the temperature can exceed 100 °C, and another cold stream, in which temperatures can fall below -40 °C. Therefore, an air fow is divided into two separate hot and cold streams, without any thermal interacton with hot or cold focuses. The vortex tube is used to demonstrate the basics of the First and Second Law of Thermodynamics. In additon, this practcal laboratory program can even be used to make sense of one of the best-known theoretcal experiments in thermodynamics, the so-called Maxwell's demon experiment (Lewins & Bejan, 1999; Liew, Zeegers, Kuerten & Michalek, 2012). It should also be noted that once a compressed air source has been provided, the material needed to prepare the practcum is simple and affordable, and the lab itself is very interestng and appeals to students. Keywords – thermodynamics, energy balance, entropy balance, exergy balance, Gouy-Stodola, exergetc efficiency, vortex tube ---------- 1 INTRODUCTION This paper attempts to present a program of laboratory experiences for use in courses on thermodynamics. It is designed for second year students in the .

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