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Heat and Mass Transfer

, Volume 44, Issue 3, pp 367–373 | Cite as

Experimental investigation of the effects of length to diameter ratio and nozzle number on the performance of counter flow Ranque–Hilsch vortex tubes

  • K. Dincer
  • S. BaskayaEmail author
  • B. Z. Uysal
Original

Abstract

In this experimental study, performance of counter flow type Ranque-Hilsch vortex tubes (RHVT), with a length to diameter ratio of 10, 15 and 18, were investigated with 2, 4, 6 nozzles. The measure of performance was chosen as the difference between the temperatures of hot output stream and cold output stream. The performances of RHVTs were experimentally tested by making use of velocity and temperature measurements of the input and output streams. It was determined that the difference between the temperatures of these streams, changed between 9 and 56 K. When all the results were assessed, it was concluded that the best performance was obtained when the ratio of vortex tube’s length to the diameter was 15 and the nozzle number was at least four, and the inlet pressure was as high as possible. Desired performance could be obtained by controlling the rate of the hot output stream.

Keywords

Mass Flow Rate Stagnation Point Inlet Pressure Vortex Tube Counter Flow 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

cp

specific heat at fixed pressure (J/(kg K)

dc

diameter of cold outlet (m)

D

internal diameter of vortex tube (m)

L

length of vortex tube (m)

\( {\mathop m\limits^ \bullet }_{c} \)

mass flow rate of the cold stream (kg/s)

\( {\mathop m\limits^ \bullet }_{h} \)

mass flow rate of the hot stream (kg/s)

\( {\mathop m\limits^ \bullet }_{i} \)

mass flow rate of the inlet stream (kg/s)

N

number of nozzles

P

pressure (Pa)

Pc

cold flow pressure of vortex tube (Pa)

Pi

inlet pressure of vortex tube (Pa)

T

temperature (K)

Tc

temperature of cold stream (K)

Th

temperature of hot stream (K)

TiT

temperature of inlet stream (K)

ΔT

difference between the temperatures of output streams [=(T h − T c), K]

ΔTc

difference between temperature of cold flow and flow at the inlet [=(T i − T c), K]

ΔTh

difference between temperature of hot flow and flow at the inlet [=(T h − T i), K]

Greek symbols

ξ

fraction for cold flow (=m c/m i)

1−ξ

fraction for hot flow (=m h/m i)

ωc

angular velocity of cold stream (rad/s)

ωh

angular velocity of hot stream (rad/s)

γ

specific heat ratio

Notes

Acknowledgments

Financial support of this study by the research fund of the Selcuk University under Grant No. 2002/124 is gratefully acknowledged.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, Faculty of Engineering and ArchitectureSelcuk UniversityKonyaTurkey
  2. 2.Department of Mechanical Engineering, Faculty of Engineering and ArchitectureGazi UniversityMaltepe, AnkaraTurkey
  3. 3.Department of Chemical Engineering, Faculty of Engineering and ArchitectureGazi UniversityMaltepe, AnkaraTurkey

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