Effect of the tube material on the thermal performance of a Ranque-Hilsch vortex tube (original) (raw)
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International Journal of Engineering Research and, 2015
The Vortex tube is a non-conventional cooling device which will produce cold air and hot air from the source of compressed air without affecting the environment. When a high pressure air is tangentially injected into vortex chamber a strong vortex flow will be created which will be split into two air streams. It can be used for any type of spot cooling or heating application. Performance of vortex tube depends on geometrical and thermo physical parameters. In this study effect of various geometrical parameters has been investigated experimentally and discussed on the performance of diverging vortex tube when length to diameter ratio is constant. Vortex tube with Divergence angle 2°,3°,4°,and 5°, conical valve angle 30°, 45°, 60°, 75° and 90°, cold end orifice diameter 5mm, 6mm, 7mm have been experimented with inlet pressure 2, 3, 4, 5 and 6 bar for optimum cold end temperature difference, COP and efficiency.
EXPERIMENTAL PERFORMANCE ANALYSIS OF VORTEX TUBE FOR VARIOUS PARAMETERS
The vortex tube (also called the Ranque-Hilsch vortex tube) is a mechanical device containing an entrance of nozzle with a central orifice, a vortex tube and a cone-shaped valve. A source of compressed gas (e.g. air) at high pressure enters the vortex tube tangentially through the inlet nozzle at high velocity. The expanding air inside the tube creates a rapidly spinning vortex. Once this vortex is set up in the tube, the air near the axis cools down while the air at periphery heats up in comparison with the inlet temperature. This phenomenon is known as temperature separation effect (also called the Ranque-Hilsch effect).In this study, three Ranque-Hilsch vortex tubes were used, which have 26.4 mm, 21.2mm, and 14.8 mm inside diameter and length/diameter ratio was 20, 30, and 40respectively. Their performances were examined as one of the classical RHVT and other was cold cascade type RHVT. Performance analysis was according to temperature difference between the inlet and the cold outlet (∆Tcold). The ∆Tcold values of cold cascade type Ranque-Hilsch vortex tubes were greater than the ∆Tcold values of classical RHVT, which were determined experimentally. The total inlet energy, total outlet energy, total lost energy and energy efficiency of cold stream were investigated by using experimental data. In both the classical RHVT and cold cascade type RHVT, it was found that as fraction of cold flow increases the total energy increases. It was also found that, the cold cascade type RHVT more energy efficiency of cold outlet than the classical RHVT. Excess ∆Tcold value of cold cascade type Ranque-Hilsch vortex tube causes the excess energy efficiency of cold outlet. The range of operating conditions covered; Pressure:-5 bar to 7 bar; cold fraction:-0.2to 1. In order to investigate the effect of materials, vortex tubes of steel, aluminium and PVC are fabricated and tested.
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/an-experimental-study-on-the-effect-of-area-ratio-divergence-angle-and-mach-number-on-thermal-performance-of-vortex-tube https://www.ijert.org/research/an-experimental-study-on-the-effect-of-area-ratio-divergence-angle-and-mach-number-on-thermal-performance-of-vortex-tube-IJERTV4IS070633.pdf The Vortex tube is a non-conventional cooling device which will produce cold air and hot air from the source of compressed air without affecting the environment. When a high pressure air is tangentially injected into vortex chamber a strong vortex flow will be created which will be split into two air streams. It can be used for any type of spot cooling or heating application. Performance of vortex tube depends on geometrical and thermo physical parameters. In this study effect of various geometrical parameters has been investigated experimentally and discussed on the performance of diverging vortex tube when length to diameter ratio is constant. Vortex tube with Divergence angle 2°,3°,4°,and 5°, conical valve angle 30°, 45°, 60°, 75° and 90°, cold end orifice diameter 5mm, 6mm, 7mm have been experimented with inlet pressure 2, 3, 4, 5 and 6 bar for optimum cold end temperature difference, COP and efficiency.
Investigation on the Changes in the Temperature that is Caused in Vortex Tube
Academic Perspective Procedia
This paper presents effect of cold mass friction, the rates of air flow, the inlet pressure, and the time on hot and cold air temperatures that are generated in the vortex tube. The vortex tube is manufactured by simple equip-ments within low prices. That proves the simplification of the vortex tube. Although the efficiency of vortex tube is low, but it produces low temperatures without using expensive cooling machines.
Experimental Studies of a Ranque-Hilsch Vortex Tube
Applied Mechanics and Materials, 2013
ABSTRACT Vortex tube is a device that separates a compressed flow of gas into two streams simultaneously, one giving kinetic energy to the other, resulting one hotter than the inlet temperature and one lower, without having any moving part. This research focuses on investigating the effects of various physical parameters on the performance of the vortex tube, namely cold nozzle diameter, length of the tube, and air mass flow rate at the hot end of the tube. In general, there are two major design features associated with the vortex tube, namely (a) maximum temperature differentials in vortex tube to produce small amount of air with very low and very high temperatures, and (b) maximum cooling/heating effect by producing large quantity of air with moderate temperatures. By considering the experimental results, an optimized set of parameters that contribute to the most efficient vortex tube design would be proposed depending on the desired design features.
Design and Performance Evaluation ofa vortex tube form by Aluminum Material
IOP Conference Series: Materials Science and Engineering, 2018
Vortex tube is a nonconventional cooling device, having stationary parts which will produce cold air and hot air fro m the source of compressed air without effecting the environment. When a high pressure air is tangentially in jected into the vortex chamber, a strong vortex flo w will be created which will be split into two air streams. The present work mainly focuses on design and fabricating the vortex tube with alu miniu m material. After fabricating, the performance of the Vortex tube is evaluated for different diameters of orifice and inlet pressures. Cooling effect and Heating effect are selected and COP as performance measures.
Experimental analysis of vortex tube by varying the geometry and material a review
Refrigeration plays an important role in developing countries, primarily for the preservation of food, medicine, and for air conditioning Conventional refrigeration systems are using Freon as refrigerant. As they are the main cause for depleting ozone layer, extensive research work is going on alternate refrigeration systems. Vortex tube (VT) is a non-conventional cooling device, having no moving parts which are capable of separating hot and cold gas stream form an inlet gas stream with a proper pressure without affecting the environment. This device suits for vital applications because of its light weight, simple and more importantly it is compact. This paper presents experimental results by the different investigators on the effect of various geometrical parameters, like nozzles, orifice, conical needle modifications, and different material like metallic and non metallic and experiment, to improve cop, cooling performance of vortex tube under these conditions listed below. 1. Tangential nozzle orientation with Symmetry/ asymmetry of around 4 nozzles with stopper. (dc= 14, 12,10,8, and 6mm), with constant nozzle diameter of 6.5 mm by varying the pressure of the inlet air 2-6 bar 5. The effects of cooling of a hot tube directly cooled by cooling water jacket. 6. The effect of cold end side which has the form of convergent helical nozzles with 7 mm orifice diameter and 6 no. of nozzles by inlet pressure (2 to 5 bar in step of 1bar ),conical valves with an angle . 7. The effect of Ranque-Hilsch vortex tube (RHVT) with threads cut (pitch is 1 and 2 mm) on its inner surface of hot tube. 8. Different materials of hot tubes with adiabatic like Mild steel, Aluminium and Copper with same L/D ratio 9. By influence of uniform curvature of main tube of VT Also by the literature review it is clear that there is no theory so perfect, which gives the satisfactory explanation of the vortex tube phenomenon. Due to this reason researcher conduct the series of experimentation to understand the effect of various parameters mentioned above to improve the performance of vortex tube.
New Trends in Fluid Mechanics Research, 2007
The phenomenon of temperature distribution in confined steady rotating gas flows is called Ranque-Hilsch effect. The simple counter-flow vortex tube consists of a long hollow cylinder with tangential nozzle at one end for injecting compressed air. The flow inside the vortex tube can be described as rotating air, which moves in a spring-shaped vortex track. The peripheral flow moves toward the hot end where a hot end plug is placed and the axial flow, which is forced back by the plug, moves in the opposite direction toward the cold end. This paper focuses on the effect of the size of hot nozzle on the performance of the Ranque-Hilsch vortex tube. Series of plugs were used in the experiment in order to find the relationship between the diameter of hot end plug and the performance of the vortex tube.
New Trends in Fluid Mechanics Research, 2009
The phenomenon of temperature distribution in confined steady rotating gas flows is called Ranque-Hilsch effect. The simple counter-flow vortex tube consists of a long hollow cylinder with tangential nozzle at one end for injecting compressed air. The flow inside the vortex tube can be described as rotating air, which moves in a spring-shaped vortex track. The peripheral flow moves toward the hot end where a hot end plug is placed and the axial flow, which is forced back by the plug, moves in the opposite direction toward the cold end. This paper focuses on the effect of the size of hot nozzle on the performance of the Ranque-Hilsch vortex tube. Series of plugs were used in the experiment in order to find the relationship between the diameter of hot end plug and the performance of the vortex tube.
EXPERIMENTAL STUDY OF HEAT AND MASS TRANSFER IN RANQUE HILSCH VORTEX TUBE
The aim of this work was to experimentally investigate the heat and mass transfer phenomenon in a Ranque Hilsch vortex tube. Experiments in a laboratory scale experimental setup were carried out to generate process data involving parameters such as inlet and outlet volumetric flow rate, temperature and pressure of gas mixture at the inlet and outlet of the Ranque Hilsch vortex tube. Air, considered as a binary mixture of Nitrogen and Oxygen gas was used as working fluid. Gas temperature and composition at inlet, cold outlet and hot outlet were measured. Further the isentropic efficiency and separation factor of the lighter species for a binary separation were calculated. It was observed while isentropic efficiency increased continuously with inlet Reynolds number there was an optimum value of inlet Reynolds number for which maximum separation factor was obtained. Also it was found that thermal and species separations in Ranque Hilsch vortex tube were interrelated.