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

Research output: Contribution to journalArticle

44 Citations (Scopus)

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 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. velocity fluctuation levels and the Reynolds shear stress levels, and a mean velocity profile approaching Virk's asymptotic condition. These effects relaX substantially with increasing streamwise distance from the injection slot and become similar to the effects observed for dilute homogeneous polymer flows.

Original languageEnglish (US)
Pages (from-to)435-466
Number of pages32
JournalJournal of Fluid Mechanics
Volume238
Issue number435
DOIs
StatePublished - Jan 1 1992

Fingerprint

turbulent boundary layer
slots
Boundary layers
velocity distribution
Statistics
statistics
injection
polymers
Polymers
free flow
Drag
drag balance
water injection
Lasers
Water injection
Skin friction
friction measurement
Deceleration
Polymer solutions
Polyethylene oxides

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

@article{bf2ed66aca5d44a58ddf2855f5fa9a3d,
title = "Velocity profile statistics in a turbulent boundary layer with slot-injected polymer",
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 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. velocity fluctuation levels and the Reynolds shear stress levels, and a mean velocity profile approaching Virk's asymptotic condition. These effects relaX substantially with increasing streamwise distance from the injection slot and become similar to the effects observed for dilute homogeneous polymer flows.",
author = "Fontaine, {Arnold Anthony} and Petrie, {H. L.} and Brungart, {Timothy A.}",
year = "1992",
month = "1",
day = "1",
doi = "10.1017/S0022112092001770",
language = "English (US)",
volume = "238",
pages = "435--466",
journal = "Journal of Fluid Mechanics",
issn = "0022-1120",
publisher = "Cambridge University Press",
number = "435",

}

Velocity profile statistics in a turbulent boundary layer with slot-injected polymer. / Fontaine, Arnold Anthony; Petrie, H. L.; Brungart, Timothy A.

In: Journal of Fluid Mechanics, Vol. 238, No. 435, 01.01.1992, p. 435-466.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Velocity profile statistics in a turbulent boundary layer with slot-injected polymer

AU - Fontaine, Arnold Anthony

AU - Petrie, H. L.

AU - Brungart, Timothy A.

PY - 1992/1/1

Y1 - 1992/1/1

N2 - 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 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. velocity fluctuation levels and the Reynolds shear stress levels, and a mean velocity profile approaching Virk's asymptotic condition. These effects relaX substantially with increasing streamwise distance from the injection slot and become similar to the effects observed for dilute homogeneous polymer flows.

AB - 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 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. velocity fluctuation levels and the Reynolds shear stress levels, and a mean velocity profile approaching Virk's asymptotic condition. These effects relaX substantially with increasing streamwise distance from the injection slot and become similar to the effects observed for dilute homogeneous polymer flows.

UR - http://www.scopus.com/inward/record.url?scp=84971688632&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84971688632&partnerID=8YFLogxK

U2 - 10.1017/S0022112092001770

DO - 10.1017/S0022112092001770

M3 - Article

AN - SCOPUS:84971688632

VL - 238

SP - 435

EP - 466

JO - Journal of Fluid Mechanics

JF - Journal of Fluid Mechanics

SN - 0022-1120

IS - 435

ER -