Experimental Investigation on the Effect of Orifice Diameter and Inlet Pressure to the Ranque-Hilsch Vortex Tube Performance

2013 ◽  
Vol 465-466 ◽  
pp. 515-519 ◽  
Author(s):  
Nurhasanah Ismail ◽  
Wisnoe Wirachman ◽  
Muhammad Fairuz Remeli
Keyword(s):  
Experimental Investigation ◽  
Temperature Difference ◽  
Mass Fraction ◽  
Vortex Tube ◽  
Cold Temperature ◽  
Inlet Pressure ◽  
Orifice Diameter ◽  
Cold Mass ◽  
Isentropic Efficiency

In this experiment, the cold mass fraction, cold temperature difference and isentropic efficiency of Ranque-Hilsch Vortex Tube were investigated and measured. Three different inlet pressures (absolute) (296633 Pa, 394699.5 Pa and 492766 Pa) and 2 type of orifice diameter (4 mm and 5 mm) were used. 5 mm orifice gives higher value of cold mass fraction (μc = 0.7067) compare to 4 mm orifice (μc = 0.3264). It is also no significant effect in cold mass fraction by changing three difference inlet pressures. 4 mm orifice has higher cold temperature difference (ΔTc = 18°C) compare to 5 mm orifice (ΔTc = 8°C) at highest inlet pressure (492766 Pa) that were used. 4 mm orifice has higher isentropic efficiency (ηisen=0.17545) compare to 5 mm orifice (ηisen=0.0834). For both orifices, the highest isentropic efficiency was obtained when the lowest inlet pressure (296633 Pa) were applied.

An Experimental Investigation of the Cold Mass Fraction, Nozzle Number, and Inlet Pressure Effects on Performance of Counter Flow Vortex Tube

2009 ◽  
Vol 131 (8) ◽  
Author(s):  
Volkan Kırmacı ◽  
Onuralp Uluer
Keyword(s):  
Experimental Investigation ◽  
Mass Fraction ◽  
Vortex Tube ◽  
Plastic Material ◽  
Momentum Conservation ◽  
Pressure Effects ◽  
Inlet Pressure ◽  
Frictional Heat ◽  
Energy Separation ◽  
Cold Mass

This paper discusses the experimental investigation of vortex tube performance as it relates to cold mass fraction, inlet pressure, and nozzle number. The orifices have been made of the polyamide plastic material. Five different orifices, each with two, three, four, five and six nozzles, respectively, were manufactured and used during the test. The experiments have been conducted with each one of those orifices shown above, and the performance of the vortex tube has been tested with air inlet pressures varying from 150 kPa to 700 kPa with 50 kPa increments and the cold mass fractions of 0.5–0.7 with 0.02 increments. The energy separation has been investigated by use of the experimentally obtained data. The results of the experimental study have shown that the inlet pressure was the most effective parameter on heating and the cooling performance of the vortex tube. This occurs due to the higher angular velocities and angular momentum conservation inside the vortex tube. The higher the inlet pressure produces, the higher the angular velocity difference between the center flow and the peripheral flow in the tube. Furthermore, the higher velocity also means a higher frictional heat formation between the wall and the flow at the wall surface of the tube. This results in lower cold outlet temperatures and higher hot outlet temperatures.

An Experimental Investigation of Performance and Exergy Analysis of a Counterflow Vortex Tube Having Various Nozzle Numbers at Different Inlet Pressures of Air, Oxygen, Nitrogen, and Argon

2010 ◽  
Vol 132 (12) ◽  
Author(s):  
Volkan Kırmacı ◽  
Onuralp Uluer ◽  
Kevser Dincer
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Vortex Tube ◽  
Plastic Material ◽  
Inlet Pressure ◽  
Energy Separation ◽  
Cooling Fluid ◽  
Heating And Cooling ◽  
Exergy Analyses ◽  
Cold Mass

An experimental investigation has been carried out to determine the thermal behavior of cooling fluid as it passes through a vortex tube and the effects of the orifice nozzle number and the inlet pressure on the heating and cooling performance of the counterflow type vortex tube (RHVT). Experiments have been performed using oxygen (O2), nitrogen (N2), and argon (Ar). Five orifices have been fabricated and used during the experimental study with different nozzle numbers of 2, 3, 4, 5, and 6. The orifices used at these experiments are made of the polyamide plastic material. The thermal conductivity of polyamide plastic material is 0.25 W/m K. To determine the energy separation, the inlet pressure values were adjusted from 150 kPa to 700 kPa with 50 kPa increments for each one of the orifices and each one of the studied fluids. The vortex tube that was used during the experiments has L/D ratio of 15 and the cold mass fraction was held constant at 0.5. As a result of the experimental study, it is determined that the temperature gradient between the cold and hot exits is decreased depending on the orifice nozzle number increase. Exergy analyses have been realized for each one of the studied fluids under the same inlet pressures with the experiments (Pi=150–700). The exergy efficiency of the vortex tube is more affected by inlet pressure than nozzle number.

Experimental Investigation on the Performance of Vortex Tube

2018 ◽  
Vol 1148 ◽  
pp. 115-121
Author(s):  
B.V.S. Raghu Vamsi ◽  
Repalle Jithendra Kumar ◽  
M.R.C. Sastry ◽  
T. Siva Krishna ◽  
M. Kamal Tej
Keyword(s):  
Experimental Investigation ◽  
Vortex Tube ◽  
Cooling Effect ◽  
Inlet Pressure ◽  
Cold Air ◽  
The Difference ◽  
Conventional Systems ◽  
Tangential Inlet ◽  
Air Streams ◽  
Isentropic Efficiency

Non-conventional systems are developed to produce cooling effect which use eco-friendly refrigerants and consuming less energy as input. In this work, a vortex tube refrigerator is fabricated from CPVC material, to which air is supplied through five tangential inlet nozzles at different inlet pressures. The inlet pressure is varied over a span of 1 kg/cm2 to 8 kg/cm2 with an interval of 1 kg/cm2. The difference between the temperatures of hot and cold air streams at outlet is observed to be increasing with time as well as for different inlet pressures. In addition the COP for the cold end side is observed to be more than at the hot end side and isentropic efficiency is observed to be increasing with inlet pressures.

Experimental study of the impacts of cold mass fraction on internal parameters of a vortex tube

2019 ◽  
Vol 104 ◽  
pp. 151-160 ◽  
Author(s):  
Nian Li ◽  
Guannan Jiang ◽  
Lichen Fu ◽  
Liming Tang ◽  
Guangming Chen
Keyword(s):  
Experimental Study ◽  
Mass Fraction ◽  
Vortex Tube ◽  
Internal Parameters ◽  
Cold Mass

Investigations of Energy Separation Effect in Vortex Tube for Natural Gases

2013 ◽  
Vol 397-400 ◽  
pp. 205-208
Author(s):  
Wen Chuan Wang ◽  
Xiang Jun Fang ◽  
Shi Long Liu ◽  
Wen Long Sun
Keyword(s):  
Mass Fraction ◽  
Vortex Tube ◽  
Pressure Ratio ◽  
Three Dimensional ◽  
Energy Separation ◽  
Separation Effect ◽  
Natural Gases ◽  
Temperature Separation ◽  
Total Temperature ◽  
Cold Mass

This paper aims to investigate fixed composition natural gases including N2, CH4 and C2H4 energy separation effect in vortex tube. Energy separation phenomena of those gases were investigated by means of three-dimensional Computational Fluid Dynamics (CFD) method. Flow fields of natural gases in fixed inlet boundary conditions were simulated. The results main factors were found that affect the energy separation with cold mass fraction being 0.7 and pressure drop ratio being 3.90. At the same time, this paper has illustrated the effects and tendencies of energy separation with gases in the tube under the same cold mass flow fraction and cold pressure ratio. The results show mixture gases total temperature difference effect is unchanged varied with the cold mass fraction; CH4% has no effect on the vortex cold end temperature separation, but varied of CH4% has an influence in total temperature and hot end separation effect; total temperature separation effect of CH4% was divided into two sections, one is0%-80%, and the other 80%-100%.

Efficiency of Vortex Tube Enclosure Cooling

2014 ◽  
Vol 666 ◽  
pp. 154-158
Author(s):  
Waraporn Rattanongphisat
Keyword(s):  
Storage Tank ◽  
Vortex Tube ◽  
Compressed Air ◽  
Environmentally Benign ◽  
Needle Valve ◽  
Pressure Regulator ◽  
Cold Flow ◽  
Natural Refrigerant ◽  
Cold Mass ◽  
Isentropic Efficiency

A vortex tube offers an alternative cooling with advantages of simplicity and compact. Using a natural refrigerant, a vortex tube enclosure cooling is environmentally benign. In this paper, the performance of a vortex tube enclosure cooling, VTEC, is investigated experimentally. The VTEC system comprises of the vortex tube cooling, an enclosure with a volume space of 0.045 m3, an air compressor, a compressed air storage tank and a compressed air line. The VTEC system is tested for its efficiency and cooling potential in the laboratory. An operating condition is controlled by a pressure regulator for an inlet air pressure of 3 bars, for energy saving, and a cold flow rate is adjusted by a needle valve near the hot exit of a vortex tube for the cold fraction between 0 and 1. Accordingly, the analysis of experimental data shows the maximum isentropic efficiency of the vortex tube enclosure cooling is 0.37 at the cold mass fraction of 0.45. Air temperature in the enclosure is about 13°C in average.

scholarly journals An Investigation of a Micro-Scale Ranque-Hilsch Vortex Tube

2006 ◽  
Author(s):  
Amar F. Hamoudi ◽  
Amir Fartaj ◽  
Gary W. Rankin
Keyword(s):  
Reynolds Number ◽  
Vortex Tube ◽  
Operating Conditions ◽  
Tube Length ◽  
Orifice Diameter ◽  
Working Fluid ◽  
Dimensionless Temperature ◽  
Separation Performance ◽  
Micro Scale ◽  
Cold Mass

The results of an experimental investigation of the energy separation performance of a micro-scale Ranque-Hilsch vortex tube are presented in this paper. The micro-scale vortex tube is 2 mm in diameter and constructed using a layered technique from multiple pieces of Plexiglas and aluminum. Four inlet slots, symmetrically located around the tube, form the vortex. The hydraulic diameter of each inlet slot and the orifice diameter for the cold exit are 229 and 800 microns respectively. The working fluid is low pressure, non-dehumidified compressed air at room temperature. The rate of the hot gas flow is varied by means of a control valve to achieve different values of cold mass fraction. The mass flow rates, temperatures and pressures of the supply and outlet flows are measured and the performance of the device presented. The supply channel Reynolds number is varied over a considerable range which extends into the laminar regime in order to determine the operating conditions for cooling. An increase in dimensionless temperature is found in both the cold and hot outlets as supply nozzle Reynolds number increases from zero. Maximum values occur at a Reynolds number of approximately 500 and the cold flow dimensionless temperature becomes negative at about 2500. Although the optimum cold mass ratio is higher than the conventional tubes, the effect on performance of tube length and cold exit diameter is similar to the conventional devices.

scholarly journals Investigation on the Changes in the Temperature that is Caused in Vortex Tube

2018 ◽  
Vol 1 (1) ◽  
pp. 673-681
Author(s):  
Unal Uysal ◽  
Selahattin Kasar
Keyword(s):  
Low Temperatures ◽  
Vortex Tube ◽  
Air Flow ◽  
Inlet Pressure ◽  
Cold Air ◽  
Air Temperatures ◽  
Cold Mass

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.

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