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Laminarization of turbulent pipe flow by fluid injection

Published online by Cambridge University Press:  29 March 2006

W. T. Pennell ,
E. R. G. Eckert  and
E. M. Sparrow
W. T. Pennell
Affiliation:
University of Minnesota, Minneapolis
E. R. G. Eckert
Affiliation:
University of Minnesota, Minneapolis
E. M. Sparrow
Affiliation:
University of Minnesota, Minneapolis
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Abstract

The effects of fluid injection on the structure of an initially fully developed, low Reynolds number, turbulent pipe flow have been studied by means of a hot-film anemometer. Measurements were made of the axial turbulence intensity field and of the time-mean streamwise velocity distribution, both in the porous-walled pipe and in the solid-walled hydrodynamic development section. Oscilloscope traces showing the timewise pattern of the local velocity fluctuations were also monitored. The Reynolds number of the air flow at the inlet of the porous pipe was varied from 3090 to 6350, and the Reynolds number of the injected air ranged from 60 to 160.

Near the tube wall, the initial effect of injection is a significant reduction of the axial turbulence level and an increase in the thickness of the viscous and buffer layers. The degree by which turbulence is reduced in this region is more or less proportional to the ratio of the injection to entrance Reynolds numbers. In the core region of the flow, which is centred about the tube axis, there is also an initial reduction in the magnitude of the axial component of turbulence which is thought to be due to injection-induced acceleration of the flow. There is also an annular region, which separates the wall and core regions, in which the turbulence intensity initially increases. In the downstream portion of the porous tube the entire flow undergoes a re-transition to fully developed turbulence.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 52 , Issue 3 , 11 April 1972 , pp. 451 - 464
Copyright
© 1972 Cambridge University Press

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References

Batchelor, G.K. 1953 The Theory of Homogeneous Turbulence, p. 68. Cambridge University Press.
Eckert, E. R. G. & Rodi, W. 1968 Reverse transition turbulent-laminar for flow through a tube with fluid injection. J. Appl. Mech. 35, 817.Google Scholar
Hinze, J. O. 1969 Turbulence. McGraw-Hill.
Huesmann, K. & Eckert, E. R. G. 1968 Untersuchungen über die laminare Strömung und den Umschlag zur Turbulenz in porösen Rohren mit gleichmässiger Einblasung durch die Rohrwand. Wärme- und Stoffübertragung, 1, 2.Google Scholar
Olson, R. M. 1964 Experimental studies of turbulent flow in to porous circular tube with uniform mass transfer through the tube wall. Ph.D. Thesis, University of Minnesota.
Pennell, W. T. 1970 The effect of uniform mass injection on the structure of turbulent flow through a porous tube. Ph.D. Thesis, University of Minnesota.
Bruun, H. H. 1971 J. Sci. Instrum. 4, 225.
Champagne, F. H., Sleicher, C. A. & Wehrmann, O. H. 1967 J. Fluid Mech. 28, 153.
Daecm, M. & Rasmussen, C. G. 1969 Disa Inf 7, 19.
Davies, P. O. A. L. & Bruun, H. H. 1968 Proc. Symp. on Instrumentation and Data Processing for Industrial Aerodynamics 1968. Nat. Phys. Lab. Teddington.
Friehe, C. & Schwarz, W. 1968 J. Appl. Mech., A.S.M.E. 35, 655.
Gilmore, D. C. 1967 Mech. Engng. Rep., McGill University, no. 67-3.
Guitton, D. E. 1968 Mech. Engng. Rep., McGill University, no. 68-6.
Guitton, D. E. & Patel, R. P. 1969 Mech. Engng. Rep. McGill University, no. 69-7.
Hinze, J. O. 1959 Turbulence an Introduction to its Mechanism and Theory. McGraw-Hill.
Perry, A. E. & Morrison, G. L. 1971 J. Fluid Mech. 47, 765.
Webster, C. 1962 J. Fluid Mech. 13, 307.