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On Shear Stress Distributions for Flow in Smooth or Partially Rough Annuli

Abstract

It is commonly assumed that for turbulent flow in annuli the radii of zero shear and maximum velocity are coincident. By inspection of the differential equations for such flow and by an integral analysis it is shown that this is not necessarily true. To check whether important differences could occur, experiments were made in which velocity and shear stress distributions were measured in one smooth and two partially rough annuli. The results show no difference in the radii for the smooth annulus, but for the partially rough annuli there was a small but significant difference. This difference explains the breakdown of Hall's transformation theory reported by other investigators. The error introduced by use of Hall's theory is however small, of the order of 10 % or less.
Publication Date:
Aug 15, 1966
Product Type:
Technical Report
Report Number:
AE-243
Resource Relation:
Other Information: 16 refs., 29 figs., 2 tabs.
Subject:
42 ENGINEERING; SHEAR; ANNULAR SPACE; ROUGHNESS; FLOW MODELS; TURBULENT FLOW; VELOCITY
OSTI ID:
20949487
Research Organizations:
AB Atomenergi, Nykoeping (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
TRN: SE0708464
Availability:
Commercial reproduction prohibited; OSTI as DE20949487
Submitting Site:
SWDN
Size:
78 pages
Announcement Date:
Dec 17, 2007

Citation Formats

Kjellstroem, B, and Hedberg, S. On Shear Stress Distributions for Flow in Smooth or Partially Rough Annuli. Sweden: N. p., 1966. Web.
Kjellstroem, B, & Hedberg, S. On Shear Stress Distributions for Flow in Smooth or Partially Rough Annuli. Sweden.
Kjellstroem, B, and Hedberg, S. 1966. "On Shear Stress Distributions for Flow in Smooth or Partially Rough Annuli." Sweden.
@misc{etde_20949487,
title = {On Shear Stress Distributions for Flow in Smooth or Partially Rough Annuli}
author = {Kjellstroem, B, and Hedberg, S}
abstractNote = {It is commonly assumed that for turbulent flow in annuli the radii of zero shear and maximum velocity are coincident. By inspection of the differential equations for such flow and by an integral analysis it is shown that this is not necessarily true. To check whether important differences could occur, experiments were made in which velocity and shear stress distributions were measured in one smooth and two partially rough annuli. The results show no difference in the radii for the smooth annulus, but for the partially rough annuli there was a small but significant difference. This difference explains the breakdown of Hall's transformation theory reported by other investigators. The error introduced by use of Hall's theory is however small, of the order of 10 % or less.}
place = {Sweden}
year = {1966}
month = {Aug}
}