Settling Length for Turbulent Flow of Air in Smooth Annuli With Square-Edged or Bellmouth Entrances

[+] Author and Article Information
K. Sridhar

Department of Mechanical Engineering, University of Windsor, Windsor, Ontario, Canada

A. A. Nicol

Department of Mechanical Engineering, University of Strathclyde, Glasgow, U. K.

A. V. A. Padmanabha

Fairchild Hiller Corporation, Riverdale, Md.

J. Appl. Mech 37(1), 25-28 (Mar 01, 1970) (4 pages) doi:10.1115/1.3408482 History: Received October 30, 1968; Revised April 14, 1969; Online July 12, 2010


Settling or hydrodynamic entrance lengths have been determined for turbulent flow of air in three smooth concentric annuli of diameter ratios 0.306, 0.527, and 0.842. Both square-edged and bellmouth entrances were investigated for Reynolds number ranging from 7000–47,500. Flow separation caused by the abrupt change in area of the square-edged entrance resulted in skewed (distorted) velocity profiles near the entrance. This skewness was modified further downstream and finally fully developed velocity profiles were established. The settling lengths for the annuli with the square-edged entrances were between 25 and 35 dia. With the bellmouth entrance, the velocity profile developed conventionally from the nearly flat profile at the inlet. The settling lengths for the bellmouth entrances were about 10–15 equivalent diameters more than those for the square-edged entrances.

Copyright © 1970 by ASME
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