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Turbulence measurements in a cylindrical wall jet

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Abstract

A cylindrical wall jet is obtained when the jet emerges from a converging nozzle and flows along a cylinder placed concentric with the nozzle. The results of hot wire measurements in the developed zone of such a cylindrical wall jet are presented. The results obtained are compared with similar measurements in a free circular jet and in a plane wall jet. The comparisons show the effect of the cylinder in the inner region, but do not reveal any effect of the cylinder in the outer mixing region. Further, it is shown that the currently available method of determining eddy diffusivity distribution in jet flows is misleading.

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Abbreviations

a :

radius of the cylinder

f :

function

r :

traverse distance from the axis of the jet

u :

axial velocity fluctuation

u′ :

root mean square of u

U :

time mean of axial velocity

U m :

local maximum axial velocity

v :

transverse velocity fluctuation

v′ :

root mean square of v

X :

axial distance from the nozzle exit

y :

traverse distance perpendicular to the wall

τ :

turbulent shear stress

δ :

radial distance from the surface of the cylinder to the point in the outer region at which U=U m/2

δ m :

radial distance from the surface of the cylinder to the point in the outer region at which U=U m

δ 0 :

radial distance from the surface of the cylinder to the point in the outer region at which τ=0

ε :

turbulent diffusivity

η :

nondimensional distance ratio, y/δ

ρ :

density

1:

Values obtained using f=exp(−0.692η 2)

2:

Values obtained using f=(1+0.414η 2)−2

References

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Authors and Affiliations

  1. Dept. of Mechanical Engineering, University of Saskatchewan, Saskatoon, Sask., Canada

    V. S. Manian & R. W. Besant

Authors
  1. V. S. Manian
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  2. R. W. Besant
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Manian, V.S., Besant, R.W. Turbulence measurements in a cylindrical wall jet. Appl. sci. Res. 21, 194–205 (1969). https://doi.org/10.1007/BF00411607

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  • DOI: https://doi.org/10.1007/BF00411607

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