Review Paper on Experimental Analysis of Vortex Tube (original) (raw)
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Review Paper on Experimental Investigation on Vortex Tube Refrigeration System
2018
A vortex tube is a simple device which splits a high pressure gas stream into a cold and hot stream without any chemical reactions or external energy supply. It is a mechanical device without any moving parts. The splitting of flow into regions of low and high temperature range is referred to as the temperature separation effect. The performance of vortex tube depends on two basic parameters, first is the working parameter such as inlet pressure of compressed air, and the other one is geometric parameters such as number of nozzles , diameter of nozzle, cone valve angle, length of hot side tube, cold orifice diameter, and as well as material of vortex tube. Vortex tube has interesting functions and several industrial applications, and, as a refrigerator, it is used as a spot cooling device in
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.
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.
An experimental investigation of the optimum geometry for the cold end orifice of a vortex tube
Applied Thermal Engineering, 2009
A vortex tube is a simple mechanical device, which splits a compressed gas stream into a cold and hot stream without any chemical reactions or external energy supply. This paper presents the results of a series of experiments focusing on various geometries of the ''cold end side" for different inlet pressures and cold fractions. Specifically, the tests were conducted using different cold end orifice diameters. Energy separation and energy flux separation efficiencies are defined and used to recover characteristic properties of the vortex tube. These are used to show an appropriate scale to non-dimensionalize the energy separation effect. The experimental results indicate that there is an optimum diameter of cold end orifice for achieving maximum energy separation. The results also show that the maximum value of energy separation was always reachable at a 60% cold fraction irrespective of the orifice diameter and the inlet pressure. The results are compared with the previous studies on internal flow structure, and optimal operating parameters are shown to be consistent with a matching of orifice size with the secondary circulation being observed.
REVIEW ON APPLICATIONS OF VORTEX TUBE REFRIGERATOR
ijetrm journal , 2021
A vortex tube is a device that separates hot and cold streams using pressurized intake gas. Energy separation is the term for this occurrence. Since the invention of the vortex tube in 1933, there has been a massive amount of literature on the subject. Many academics throughout the world are interested in improving the device's performance and understanding the basic mechanism of energy separation. The ability to produce hot/cold gases without the need of a mechanical device, on the other hand, has found interesting applications in the literature. This review paper suggests that vortex tubes be used in a variety of applications. Every application's operational parameters are tabulated and investigated. The reader will find a fascinating choice in recovering energy from pressurized gas and the ability to meet certain applications required in a particular industry in this collection of papers on counter-flow vortex tubes targeted towards the application.
Vortex tube is a device which does not have any moving part and having high development potential in emerging area of energy. Vortex tube is smile energy separating device which separate compressed air into hot and cold stream. The compressed air is tangentially injected to the tube through the nozzle to developed swirl motion in the tube. The RHVT (Ranque-Hilsch Vortex Tube) has been used for many decades in various engineering applications. Because of its compact design and little maintenance requirements, it is very popular in heating and cooling processes. Despite its simple geometry, the mechanism that produces the temperature separation inside the tube is fairly complicated. A number of observations and theories have been explored by different investigators concerning this phenomenon. Vortex tube of different geometrical parameter gives optimum performance at different cold fraction. This paper gives experiment result of energy separation in vortex tube for different tube diam...
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.
Modification and experimental research on vortex tube
International Journal of Refrigeration, 2007
Vortex tube (VT) is a simple energy separating device which is compact and simple to produce and to operate. Although intensive research has been carried out in many countries over the years, the efficiency is still low. In order to improve the energy separate efficiency of vortex tubes, three innovative technologies were applied to vortex tubes. A new nozzle with equal gradient of Mach number and a new intake flow passage of nozzles with equal flow velocity were designed and developed to reduce the flow loss. A new kind of diffuser invented by us was installed for reducing friction loss of air flow energy at the end of the hot end tube of vortex tube, which can greatly improve the performance of vortex tube. The experiment results indicated that these modifications could remarkably improve the performance of vortex tube. The developed vortex tube was not only superior to the conventional vortex tube but also superior to that made by two companies in world under big cold gas mass flow ratio.
Vortex tube is a device which is capable of separating hot and cold gas stream form an inlet gas stream with a proper pressure .Separating cold and hot streams by using vortex tube can be used in industrial applications such as cooling equipment and refrigerators. This device suits for these applications because its light ,simple and more importantly it is compact. Many researches have been carried out in order to identify the factor which affects Vortex tube performance .Here ,an experimental study has been conducted to determine the effect of geometrical parameters on vortex tube performance and air also used as a working fluid .To achieve the maximum proficiency of a vortex tube ,form the data which obtained experimentally , optimum values for cold orifice diameter to the VT inlet diameter (d / D) and the length of VT to its inlet diameter (L/ D) for this experiment proposed.
A Review of Vortex Tube Refrigeration System
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 depletion of ozone layer, extensive research work is going on alternate refrigeration systems. Vortex tube is a non conventional cooling device, having no moving parts 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, one hot stream and the other is cold stream at its ends. An experimental investigation is to be performed in order to realize the behavior of a vortex tube system. In this work attention has to be focused on the classification of the parameters affecting vortex tube operation. The effective parameters are divided into two different ...