Numerical prediction of vortex flow and thermal separation in a subsonic vortex tube

2006 ◽  
Vol 7 (8) ◽  
pp. 1406-1415 ◽  
Author(s):  
Eiamsa-ard Smith ◽  
Promvonge Pongjet
Keyword(s):  
Vortex Flow ◽  
Vortex Tube ◽  
Numerical Prediction

An Experimental and Analytical Study of Vortex-Flow Temperature Separation by Superposition of Spiral and Axial Flows: Part 1

1959 ◽  
Vol 81 (3) ◽  
pp. 202-211 ◽  
Author(s):  
J. E. Lay
Keyword(s):  
Analytical Study ◽  
Vortex Flow ◽  
Vortex Tube ◽  
Radial Distance ◽  
Sink Strength ◽  
Stagnation Temperature ◽  
Spiral Flow ◽  
Temperature Separation ◽  
Forced Vortex ◽  
Potential Vortex

This paper reports on an experimental and analytical study of compressible flow in a uniflow vortex tube. Part 1 deals with an experimental study, Part 2 with the analytical study. Its purpose is to provide a better understanding of the separation of a gas stream into regions of high and low stagnation temperatures, there being at present little agreement as to the theory of operation. The problem is first approached from the experimental standpoint. A large, multipurpose vortex tube is so designed and built that pressure, temperature, and velocity traverses can be taken at six different stations throughout the length of the tube. Pressure, temperature, and velocity traverses are taken by means of hypodermic probes. Velocities are checked by means of a miniature hot-wire anemometer. Data are taken for different runs of inlet pressures and plotted against radial distance. Flow visualization is obtained by means of liquid injection. The analytical study consists of using superposition for the solution of the flow equations. It begins with potential vortex flow in the plane. The solution of this flow is characterized by the existence of sonic or limit circles. Superposition of a sink flow to the vortex solution yields a spiral flow in the plane. The general solution in space is obtained by addition of a uniform axial velocity to the spiral flow. When viscosity effects are considered, the potential vortex changes into a forced vortex, and the solution becomes a superposition of a viscous compressible sink to a forced vortex. Performance or stagnation temperature separation is expressed as function of the ratio of vortex strength to sink strength.

Observations and LDA measurements of confined turbulent vortex flow

1980 ◽  
Vol 98 (1) ◽  
pp. 49-63 ◽  
Author(s):  
M. P. Escudier ◽  
J. Bornstein ◽  
N. Zehnder
Keyword(s):  
Axial Velocity ◽  
Vortex Flow ◽  
Vortex Tube ◽  
Reversed Flow ◽  
Remarkable Change ◽  
Fluid Medium ◽  
Turbulent Vortex ◽  
Average Value ◽  
Annular Jet ◽  
Order Of Magnitude

A series of LDA measurements and visual observations of confined turbulent vortex flow are described. The experiments were performed with water as the fluid medium in a vortex tube of length-to-diameter ratio L/D = 3.8 for a range of exit diameters De between De/D = 1 and 0.18. The experiments reveal a remarkable change in the vortex structure as De is reduced: from a thick core with an axial-velocity defect in the centre, and even reversed flow, to a thin annular jet-like core with a peak axial velocity more than an order of magnitude greater than the average value and again a central velocity deficit. The corresponding swirl profiles are not remarkable and are well-represented under all conditions by the solution of Burgers (1948), albeit with a velocity maximum which is strongly dependent upon De.

Analysis of Y Type Branch Pipe Exhaust Ventilation Flow Characteristics

2014 ◽  
Vol 556-562 ◽  
pp. 1054-1058
Author(s):  
Sheng Wei Song ◽  
Zi Peng Wang ◽  
Chen Sheng Yang
Keyword(s):  
Gas Flow ◽  
Vortex Flow ◽  
Vortex Tube ◽  
Branch Pipe ◽  
Flow Characteristics ◽  
Exhaust Ventilation ◽  
Fluent Software ◽  
The Difference ◽  
Entrance Pressure ◽  
Main Entrance

In order to study the internal gas flow of Y type branch pipes in the exhaust ventilation conditions, the branch pipe is simulated by using FLUENT software. Combined with experimental results, comparatively analyze exhaust ventilation pressure, velocity and vortex flow of the branch pipe. The results show that simulation and experimental data consistent overall trend, the difference is less than 8%, the main entrance pressure of the branch pipeline decreases with the width of the leakage increasing, leakage width of 0 mm, 1 mm, 2 mm cases, there is vortex tube, and valve and the main ventilation pipe case gas exchange occurs when no leakage, this study provides a theoretical and practical basis for further analysis of branch pipe exhaust ventilation.

Paper 25: Vortex Flow in a Cylinder

1969 ◽  
Vol 184 (7) ◽  
pp. 65-75
Author(s):  
P. L. Betts ◽  
Y-K. Yue
Keyword(s):  
Pressure Drop ◽  
Internal Combustion Engine ◽  
Cross Sections ◽  
Axial Velocity ◽  
Vortex Flow ◽  
Vortex Tube ◽  
Swirling Flow ◽  
Combustion Engine ◽  
Engine Cylinder ◽  
Port Opening

The swirling flow inside certain types of internal combustion engine depends in a complex way on a large number of variables. The steady flow of air through a cylinder, which reproduces the main features of an induction swirl engine cylinder, has been investigated. The pressure drop across the inlet ports, the port inclination, and the port opening were varied independently while other variables were held constant. For each condition, tangential velocities were measured and axial velocity directions observed over cross-sections of the cylinder. The results have been compared with a simplified hypothesis of R. S. Benson and with theories of the Ranque–Hilsch vortex tube.

EXPERIMENTAL INVESTIGATION ON TEMPERATURE SEPARATION OF DUAL FORCED FLOW VORTEX TUBE

2014 ◽  
Vol 22 (04) ◽  
pp. 1450023
Author(s):  
G. MARUTHI PRASAD YADAV ◽  
P. MALLIKARJUNA REDDY ◽  
B. UMA MAHESWAR GOWD
Keyword(s):  
Vortex Flow ◽  
Vortex Tube ◽  
Temperature Drop ◽  
Forced Flow ◽  
Flow Rates ◽  
Temperature Separation ◽  
Forced Vortex ◽  
Mass Flow Rates ◽  
Flow Vortex ◽  
Air Streams

The vortex tube is a device, which emanates hot and cold air streams simultaneously at its two ends from a source of pressurized air: warmer, gas leaves near the periphery at one end as a free vortex and colder, gas leaves via an orifice at the opposite end as a forced vortex. The forced vortex strikes back again by design modifications, result in the formation of one more forced vortex flow. Thus, the modified vortex tube is named as dual forced flow vortex tube (DFFVT). Experimental study is carried on temperature separation of DFFVT for varying pressures, mass flow rates and optimum cold fractions at two ends for efficient temperature drop is revealed. The modified vortex tube yields effectual temperature drop through one end at a lower cold fraction meanwhile providing effective cooling at the other end with higher cold fraction and vice versa.

Cue utilization in a numerical prediction task

1974 ◽  
Author(s):  
Sarah Lichtenstein ◽  
Timothy C. Earle ◽  
Paul Slovic
Keyword(s):  
Numerical Prediction ◽  
Cue Utilization ◽  
Prediction Task

ANALISIS VARIASI JUMLAH SUDU TURBIN BERPENAMPANG PELAT DATAR PADA TURBIN AIR ALIRAN VORTEX DENGAN TIPE SALURAN MASUK INVOLUTE

2020 ◽  
Vol 7 (2) ◽  
pp. 72-78
Author(s):  
Adnan Al Farisi ◽  
Yopi Handoyo ◽  
Taufiqur Rokhman
Keyword(s):  
Power Plant ◽  
Alternative Energy ◽  
Vortex Flow ◽  
Experimental Methods ◽  
Turbine Efficiency ◽  
A Value ◽  
Current Voltage ◽  
Materials Research ◽  
The One ◽  
Flow Vortex

The One of alternative energy that is environmentally friendly is by untilize water energy and turn it into a Microhydro power plant. Microhydro power plant usually made from utilize the waterfall with the head fell. While utilization for streams with a head small drop is not optimal yet. This is a reference to doing research on harnessing the flow of a river that has a value of head low between 0.7 m – 1.4 m with turning it into a Vortex flow (vortex). The purpose of this research is to know  the effect variation number of blade on power and efficiency in the vortex turbine. This research uses experimental methods to find current, voltage, torque and rpm using a reading instrument. The materials research vortex turbine used 6 blade, 8 blade and 10 blade with flat plate. The result showed the highest efficiency is 29,93 % with produce turbine power is 19,58 W, generated on turbine with variation 10 blade with load 3,315 kg and the capacity of water 10,14 l/s. Followed with an efficiency 24,17% and produce turbine power is 15,81 W, generated on turbine with the variation 8 blade with load 3,315 kg and the capacity of water is 10,14 l/s. The the lowest turbine efficiency 22,32% with produce tuebine power 14,60 W, generated on turbine with the variation 6 blade with load 3,315 kg, the capacity of water is 10,14 l/s.

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