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Velocity profile statistics in a turbulent boundary layer with slot-injected polymer

Published online by Cambridge University Press:  26 April 2006

A. A. Fontaine ,
H. L. Petrie  and
T. A. Brungart
A. A. Fontaine
Affiliation:
The Pennsylvania State University, Applied Research Laboratory. State College, PA 16804, USA
H. L. Petrie
Affiliation:
The Pennsylvania State University, Applied Research Laboratory. State College, PA 16804, USA
T. A. Brungart
Affiliation:
The Pennsylvania State University, Applied Research Laboratory. State College, PA 16804, USA
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Abstract

The modification of a flat-plate turbulent boundary layer resulting from the injection of drag-reducing polymer solutions through a narrow inclined slot into the near-wall region of the flow has been studied. Two-component coincident laser-Doppler velocity profile measurements were taken with a free-stream velocity of 4.5 m/s with polymer injection, water injection, and no injection. Polyethylene oxide solutions at concentrations of 500 and 1025 w.p.p.m. were injected. These data are complemented by polymer concentration profile measurements that were taken using a laser-induced-fluorescence technique. Also, integrated skin friction measurements were made with a drag balance for a range of polymer injection conditions and free-stream velocities. The immediate effects of polymer injection are a deceleration of the flow near the wall, a dramatic decrease of the vertical r.m.s. velocit}’ fluctuation levels and the Reynolds shear stress levels, and a mean velocity profile approaching Virk's asymptotic condition. These effects relax substantially with increasing stream wise distance from the injection slot and become similar to the effects observed for dilute homogeneous polymer flows.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 238 , May 1992 , pp. 435 - 466
Copyright
© 1992 Cambridge University Press

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