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Turbulence measurements from a plane air jet with buoyancy induced curvature

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Abstract

An experimental investigation of the turbulence structure of a heated plane air jet discharged at various angles into quiescent surroundings is described. Hot-wire anemometry was used to obtain the profiles of mean and turbulent velocities and temperature normal and tangential to the curved path of the flow. Measurements in the buoyancy induced curved region of the jet show the relative influence of the stability induced by both buoyancy and jet curvature on the turbulence structure.

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Abbreviations

b u :

velocity half-width, m

D :

nozzle width at the jet exit, m

Fr :

jet exit densimetric Froude number, (ρ0U 20 /gDΔρ0)

g :

gravitational acceleration, m/s2

n :

normal curvilinear axis of local jet flow, m

R :

streamline curvature of jet centreline, m

Re :

jet exit Reynolds number, (ρ0U0D/μ0)

s :

streamwise curvilinear axis of local jet flow, m

T :

instantaneous temperature, °C

t, t′ :

fluctuating and rms temperatures, °C

ΔT :

excess temperature (T−Ta),°C

U :

instantaneous velocity in s-direction, m/s

u, u′ :

fluctuating and rms velocities in s-direction, m/s

V :

instantaneous velocity in n-direction, m/s

v, v′ :

fluctuating and rms velocities in n-direction, m/s

x, y :

streamwise and transverse axes fixed with respect to the jet exit angle, m

θ :

jet discharge angle relative to vertical (θ=0)

ϱ :

air density, kg/m3

a :

ambient

c :

jet centreline

o :

jet exit

References

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Author information

Author notes

  1. A. A. Abdel-Rahman

    Present address: Dept. of Mechanical Engineering, University of Alexandria, Alexandria, Egypt

Authors and Affiliations

  1. Dept. of Mechanical Engineering, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada

    A. A. Abdel-Rahman, G. J. Hitchman, A. B. Strong & P. R. Slawson

Authors
  1. A. A. Abdel-Rahman
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  2. G. J. Hitchman
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  3. A. B. Strong
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  4. P. R. Slawson
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Additional information

The authors gratefully acknowledge the financial support of the Natural Sciences and Engineering Research Council of Canada.

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Abdel-Rahman, A.A., Hitchman, G.J., Strong, A.B. et al. Turbulence measurements from a plane air jet with buoyancy induced curvature. Experiments in Fluids 16, 336–339 (1994). https://doi.org/10.1007/BF00195433

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  • DOI: https://doi.org/10.1007/BF00195433

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