Experimental Study of Two-Phase Propane Expanded through the Ranque-Hilsch Tube

1979 ◽  
Vol 101 (2) ◽  
pp. 300-305 ◽  
Author(s):  
R. L. Collins ◽  
R. B. Lovelace
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Vortex Tube ◽  
Saturated Liquid ◽  
Two Phase ◽  
Separation Effect ◽  
Temperature Separation ◽  
Significant Temperature ◽  
Saturated Mixture ◽  
Flow Through

When air or other gases flow through the Ranque-Hilsch vortex tube, the well known temperature separation effect can be produced. This effect has been utilized for many purposes and is especially useful in providing cooling in applications not requiring the higher efficiencies of more sophisticated refrigeration systems. When the inlet fluid to the tube becomes a mixture of saturated liquid and vapor, one intuitively expects the temperature separation to diminish. Experimental data were obtained using propane to quantitatively determine the deterioration of temperature separation when the condition of the inlet fluid becomes a saturated mixture. Observations indicate that temperature separation diminishes rapidly for inlet qualities of less than 80 percent due largely to the decrease in “hot side” temperature. For qualities above 80 percent, significant temperature separation can be maintained.

Pressure-Driven Ranque-Hilsch Temperature Separation in Liquids

1988 ◽  
Vol 110 (2) ◽  
pp. 161-164 ◽  
Author(s):  
R. T. Balmer
Keyword(s):  
Theoretical Analysis ◽  
Liquid Water ◽  
Vortex Tube ◽  
Second Law Of Thermodynamics ◽  
Inlet Pressure ◽  
Second Law ◽  
Separation Effect ◽  
Temperature Separation ◽  
Significant Temperature ◽  
Pressure Driven

The temperature separation phenomenon of the Ranque-Hilsch (vortex) tube is not limited to compressible gases and vapors. Theoretical analysis using the Second Law of Thermodynamics establishes that a net entropy producing temperature separation effect is possible when incompressible liquids are used in these devices. Experiments with liquid water in a commercial counterflow Ranque-Hilsch tube designed for use with air verify that significant temperature separation does in fact occur when a sufficiently high inlet pressure is used.

Study of Bubbly Flow Through a Packed Bed

2011 ◽  
Author(s):  
Daeseong Jo ◽  
Shripad T. Revankar
Keyword(s):  
Experimental Data ◽  
Comparative Study ◽  
Bubble Size ◽  
Bubbly Flow ◽  
Packed Bed ◽  
Bubble Coalescence ◽  
Size Distributions ◽  
Two Phase ◽  
Bubble Breakup ◽  
Flow Through

A two phase bubbly flow through a packed bed was studied for dominant bubble breakup and coalescence mechanisms through experiments and CFD modeling. Data on various two-phase parameters, such as local void fraction, bubble velocity, size, number, and shape were obtained from the high speed video images. Results indicated that when a flow regime changed from bubbly to either trickling or pulsing flow, the number of average size bubbles significantly decreased and the shape of majority of bubbles was no longer spherical. The bubble coalescence and breakup mechanisms depend on local conditions such as local velocity of the bubble and pore geometry. The CFD analysis using CFX software package was carried out to study bubble size distributions. In the analysis the models for interactions were examined for each case of bubble breakup flow and bubble coalescence. A comparative study was performed on the resulting bubble size distributions, breakup and coalescence rates estimated by individual models. For change of bubble size distributions along the axial direction medians was used as an comparative parameter and the CFD results on bubble medians were compared against the experimental data. This comparative study showed that the predictions estimated by CFD analyses with the bubble breakup and coalescence models currently available in the literature do not agree with the experimental data.

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%.

Experimental Study of Two-Phase Flow Through Distributors

2006 ◽  
Author(s):  
Hugo Canière ◽  
Christophe T'Joen ◽  
Arnout Willockx ◽  
Michel De Paepe
Keyword(s):  
Experimental Study ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Through

Experimental Study on Resistance Characteristics in a 3 × 3 Rod Bundle

2014 ◽  
Author(s):  
Chaoxing Yan ◽  
Changqi Yan ◽  
Licheng Sun ◽  
Yang Wang
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Pressure Drop ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Local Resistance ◽  
Local Pressure ◽  
Two Phase ◽  
Frictional Pressure Drop ◽  
Rod Bundle

Experimental study on resistance of air-water two-phase flow in a vertical 3 × 3 rod bundle was carried out under normal temperature and pressure. The rod diameter and pitch were 8 mm and 11 mm, respectively. The ranges of gas and liquid superficial velocity were 0.013∼3.763 m/s and 0.076∼1.792 m/s, respectively. The result indicated that the existing correlations for calculating frictional coefficient in the rod bundle and local resistance coefficient could not give favorable predictions on the single-phase experimental data. For the case of two-phase flow, eight correlations for calculating two-phase equivalent viscosity poorly predicted the frictional pressure drop, with the mean absolute errors around 60%. Meanwhile, the eight classical two-phase viscosity formulae were evaluated against the local pressure drop at spacer grid. It is shown that Dukler model predicted the experimental data well in the range of Rel<9000 while McAdams correlation was the best for Rel⩾9000. For all the experimental data, Dukler model provided the best prediction with MRE of 29.03%. Furthermore, approaches to calculate two-phase frictional pressure drop and local resistance were proposed by considering mass quality, two-phase Reynolds number and densities in homogenous flow model, resulting in a good agreement with the experimental data.

Paper 15: Critical Conditions during the Flow of Two-Phase Mixtures through Nozzles

1967 ◽  
Vol 182 (8) ◽  
pp. 145-151
Author(s):  
D. Chisholm
Keyword(s):  
Experimental Data ◽  
Water Flow ◽  
Liquid Mixtures ◽  
Critical Conditions ◽  
Sonic Velocity ◽  
Two Phase ◽  
Flow Through

Equations are developed for the flow of gas-liquid mixtures through nozzles under conditions of critical or ‘choking’ flow. The equations are compared with experimental data obtained during air-water flow through nozzles and pipes at almost atmospheric pressures. Comparison is also made with data on the sonic velocity in mixtures. Additional problems arising with vapour-liquid mixtures are also discussed.

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