Skip to main content Accessibility help
×
Home

Experiments on turbulent-flow phenomena in eccentric annular ducts

  • V. K. Jonsson (a1) and E. M. Sparrow (a1)

Abstract

The investigation to be described here is a wide-ranging experimental study aimed at determining both the details of the flow field and the pressure drop and friction factor characteristics for turbulent flow in eccentric annular ducts. The experiments were performed utilizing three annular ducts of different diameter ratios; in each case the eccentricity was varied from zero (concentric annulus) to unity (walls in contact). To provide the broadest possible perspective, the measurements of the velocity field are presented in three different ways. First, contour maps showing lines of constant velocity are constructed. From these are deduced circumferential distributions of the local shear stress on the bounding walls. Velocity profiles along lines normal to the walls are represented in terms of both law-of-the-wall variables and defect-law variables. Neither of these representations affords complete agreement with the universal circular-tube distributions. In general, the defect law provides a somewhat closer correlation of the results for the eccentric annulus with those for the tube. The experimental findings do not substantiate a prior analytical model which assumes that the universal law of the wall applies on all lines normal to the bounding walls of the annulus. Friction factors, based on static pressure measurements, are shown to decrease with increasing eccentricity. The measured friction factors are in fair agreement with those of analysis. Hydrodynamic development lengths, deduced from entrance-region pressure data, are found to increase with increasing eccentricity. Circumferential pressure variations also increase with eccentricity.

Copyright

References

Hide All
Brighton, J. A. & Jones, J. B. 1964 Fully developed turbulent flow in annuli. J. Basic Engineering, D 86, 835.
Deissler, R. G. & Taylor, M. F. 1955 Analysis of fully developed turbulent heat transfer and flow in an annulus with various eccentricities. NACA TN no. 3451.
Dodge, N. A. 1963 Friction losses in annular flow. The American Society of Mechanical Engineers, paper no. 63-WA-11.
Eckert, E. R. G. & Irvine, T. F. 1955 Simultaneous turbulent and laminar flow in ducts with noncircular cross-sections. J. Aero. Sci. 22, 65.
Hinze, J. O. 1959 Turbulence. New York: McGraw-Hill.
Jonsson, V. K. 1965 Experimental studies of turbulent flow phenomena in eccentric annuli. Ph.D. Thesis, University of Minnesota, Minneapolis, Minnesota.
Sparrow, E. M., Eckert, E. R. G. & Minkowycz, W. J. 1963 Heat transfer and skin friction for turbulent boundary-layer flow longitudinal to a circular cylinder. J. App. Mech. E 30, 37.
Wolffe, R. A. 1962 Axial turbulent flow in a circular pipe containing a fixed eccentric core. M.S. Thesis, Lehigh University, Bethlehem, Pennsylvania.
MathJax
MathJax is a JavaScript display engine for mathematics. For more information see http://www.mathjax.org.

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed