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Steady entry flow in a curved pipe

Published online by Cambridge University Press:  21 April 2006

P. H. M. Bovendeerd ,
A. A. Van Steenhoven ,
F. N. Van De Vosse  and
G. Vossers
P. H. M. Bovendeerd
Affiliation:
Departments of Mechanical Engineering and Physics, Eindhoven University of Technology, The Netherlands
A. A. Van Steenhoven
Affiliation:
Departments of Mechanical Engineering and Physics, Eindhoven University of Technology, The Netherlands
F. N. Van De Vosse
Affiliation:
Departments of Mechanical Engineering and Physics, Eindhoven University of Technology, The Netherlands
G. Vossers
Affiliation:
Departments of Mechanical Engineering and Physics, Eindhoven University of Technology, The Netherlands
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Abstract

Laser-Doppler velocity measurements were performed on the entry flow in a 90° bend of circular cross-section with a curvature ratio a/R = 1/6. The steady entry velocity profile was parabolic, having a Reynolds number Re = 700, with a corresponding Dean number κ = 286. Both axial and secondary velocities were measured, enabling a detailed description of the complete flow field. The secondary flow at the entrance of the bend was measured to be directed completely towards the inner bend. Significant disturbance of the axial velocity field was not measured until a downstream distance (aR)½. Maximum secondary velocities were measured at 1.7 (aR)½ downstream from the inlet. The development of the axial flow field can be quite well explained from the secondary velocity field.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 177 , April 1987 , pp. 233 - 246
Copyright
© 1987 Cambridge University Press

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