Numerical Investigation of Ranque-Hilsch Energy Separation Effect

2013 ◽  
Vol 281 ◽  
pp. 355-358 ◽  
Author(s):  
A.S. Noskov ◽  
V.N. Alekhin ◽  
A.V. Khait
Keyword(s):  
Turbulence Model ◽  
Vortex Tube ◽  
Conservation Equation ◽  
Energy Separation ◽  
Separation Mechanism ◽  
Spiral Flow ◽  
Separation Effect ◽  
Energy Conservation Equation ◽  
Model Equations ◽  
Semi Empirical

Some results of investigation of energy separation mechanism included in numerical model equations of air spiral flow appearing in Ranque-Hilsch vortex tube are presented in the article. Standard k-ε turbulence model had been used in the simulations. It was found that k-ε turbulence model make possible to predict Ranque-Hilsch energy separation effect by using special semi empirical term in energy conservation equation which accounts for turbulence heat conductivity effects.

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%.

Investigation of the energy separation mechanism in the vortex tube

2002 ◽  
Author(s):  
Chang Hyun Sohn ◽  
Uhe Hyun Jung ◽  
Chang Soo Kim
Keyword(s):  
Vortex Tube ◽  
Energy Separation ◽  
Separation Mechanism

Investigations of Energy Separation Effect in Vortex Tube for Real Gases

2013 ◽  
Vol 724-725 ◽  
pp. 1293-1300
Author(s):  
Jing Tang ◽  
Wen Chuan Wang ◽  
Xiang Jun Fang ◽  
Shi Long Liu ◽  
Wen Long Sun
Keyword(s):  
High Pressure ◽  
Natural Gas ◽  
Vortex Tube ◽  
Ideal Gas ◽  
Energy Separation ◽  
Separation Effect ◽  
Real Gas ◽  
Real Gas Effect ◽  
Effect Difference ◽  
Gas Effect

This paper aims to investigate real gases energy separation effect such as real natural gas, CH4 and C2H4 in vortex tube. Energy separation phenomena of real natural gas (RNG) were investigated by means of three-dimensional Computational Fluid Dynamics (CFD) method. Flow fields of ideal natural gas (ING), or RNG in low and high pressure were simulated. The results main factors were found that affect the separation effect. At the same time, this paper has illustrated the effect and tendency of energy separation with real gas in the tube under the same cold mass fraction and pressure ratio. The results show low pressure ideal gas and real gas energy separation effect difference about 3-4°C, the real gas effect is not obvious; High pressure real natural gas (HPRNG) and ideal gas (HPING) effect difference is 13-14°C, the real gas effect is obvious; CH4 (LRCH4) and C2H4 (HRC2H4) energy separation effect is obvious and effect of real gas is generated.

NUMERICAL RESEARCH ON A SPECIAL FLUID PHENOMENON: RANQUE-HILSCH EFFECT

2005 ◽  
Vol 19 (28n29) ◽  
pp. 1723-1726 ◽  
Author(s):  
J. Y. LIU ◽  
M. Q. GONG ◽  
Y. ZHANG ◽  
H. HONG ◽  
J. F. WU
Keyword(s):  
High Speed ◽  
Numerical Solutions ◽  
Vortex Tube ◽  
Flow Characteristics ◽  
Temperature Fields ◽  
Energy Separation ◽  
Separation Effect ◽  
Speed Flow ◽  
Flow Features ◽  
Numerical Research

An application of CFD model for the simulation of a strongly swirling and high speed flow in the vortex tube is presented in this paper. A partly modified standard K-ε turbulent model has been used to investigate the flow characteristics and energy separation effect in the vortex tube. It is found that there is an obvious energy separation effect in the vortex tube and the numerical solutions of the flow and temperature fields agree well with the experiments. More detailed flow features are obtained by the CFD calculation. Based on the validated numerical model, the influence of the cold flow fraction on the energy separation effect is also investigated and compared with experimental results.

Investigations of Energy Separation Effect in Vortex Tube for Different Gases

2013 ◽  
Vol 724-725 ◽  
pp. 1227-1233
Author(s):  
Wen Chuan Wang ◽  
Xiang Jun Fang ◽  
Wen Long Sun ◽  
Qi Tai Eri ◽  
Shi Long Liu
Keyword(s):  
Heat Capacity ◽  
Natural Gas ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Vortex Tube ◽  
Energy Separation ◽  
Separation Effect ◽  
Polyatomic Gas ◽  
Different Gases ◽  
Monatomic Gas

The paper aims to investigate the energy separation effect of gases such as natural gas to vortex tube. Energy separation phenomena of different gases were investigated by means of three-dimensional Computational Fluid Dynamics (CFD) method. Flow fields of natural gas, air, nitrogen, et al were simulated. The main factors that affect the energy separation were found. With cold mass fraction being 0.7 and pressure drop ratio being 3.90, the results show the effect can be divided into three intervals in terms of the freedom degrees. The first interval is filled with monatomic gas at 50°C to 60°C; the second diatomic gas at40°C to 50°C; and the third polyatomic gas at 0°C to 40°C. In monatomic gas and diatomic gas, the smaller the gas specific heat capacity is, the better effect will be. However, in polyatomic gas, bigger specific heat capacity ensures better energy separation.

scholarly journals Numerical research of the compressible flow in a vortex tube using OpenFOAM software

2017 ◽  
Vol 21 (suppl. 3) ◽  
pp. 745-758 ◽  
Author(s):  
Jela Burazer ◽  
Aleksandar Cocic ◽  
Milan Lecic
Keyword(s):  
Vortex Tube ◽  
Swirling Flow ◽  
Energy Separation ◽  
Separation Mechanism ◽  
Computational Domain ◽  
Mean Flow ◽  
Transport Models ◽  
Flow Phenomena ◽  
Numerical Research ◽  
Good Agreement

The work presented in this paper is dealing with numerical simulation of energy separation mechanism and flow phenomena within a Ranque-Hilsch vortex tube. Simulation of turbulent, compressible, highly swirling flow inside vortex tube is performed using RANS approach, with Favre averaged conservation equations. For turbulence closure, k-? and k-? shear-stress transport models are used. It is assumed that the mean flow is axisymmetric, so the 2-D computational domain is used. Computations were performed using open-source CFD software Open- FOAM. All compressible solvers available within OpenFOAM were tested, and it was found that most of the solvers cannot predict energy separation. Code of two chosen solvers, which proved as the most robust, is modified in terms of mean energy equation implementation. Newly created solvers predict physically accepted behavior in vortex tube, with good agreement with experimental results. Comparison between performances of solvers is also presented.

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