A report on PIV measurements in a drag-reducing turbulent flow

Heshmat Massah, Zi C. Liu, Thomas J. Hanratty, Ronald Adrian

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)

Abstract

The addition of a small amount of a long chain, high-molecular weight polymer to the turbulent flow of a Newtonian fluid causes drag-reduction. The mechanism for this phenomena is not well understood. Pulsed image velocimetry was used to capture the structure of turbulent flow of water and a polymer solution in planes parallel and perpendicular to the top wall of a channel. A 40% drag reduction was obtained with a 3.5 ppm polymer solution. The two flow fields at the center plane were quite similar. However, at a plane close to the wall, long, stream wise, streaks of low and high momentum flow were observed in the polymer solution, the low speed streaks being more prominent. These streaky structures did not appear in the flow field of water at the same physical location. This seems to suggest that the streamwise vortices are enlarged as a result of addition of polymers.

Original languageEnglish (US)
Title of host publicationAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
Pages101-103
Number of pages3
Volume239
StatePublished - 1996
Externally publishedYes

Fingerprint

Polymer solutions
Turbulent flow
Drag
Drag reduction
Flow fields
Flow of water
Polymers
Velocity measurement
Momentum
Vortex flow
Molecular weight
Fluids
Water

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Massah, H., Liu, Z. C., Hanratty, T. J., & Adrian, R. (1996). A report on PIV measurements in a drag-reducing turbulent flow. In American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED (Vol. 239, pp. 101-103)

A report on PIV measurements in a drag-reducing turbulent flow. / Massah, Heshmat; Liu, Zi C.; Hanratty, Thomas J.; Adrian, Ronald.

American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. Vol. 239 1996. p. 101-103.

Research output: Chapter in Book/Report/Conference proceedingChapter

Massah, H, Liu, ZC, Hanratty, TJ & Adrian, R 1996, A report on PIV measurements in a drag-reducing turbulent flow. in American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. vol. 239, pp. 101-103.
Massah H, Liu ZC, Hanratty TJ, Adrian R. A report on PIV measurements in a drag-reducing turbulent flow. In American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. Vol. 239. 1996. p. 101-103
Massah, Heshmat ; Liu, Zi C. ; Hanratty, Thomas J. ; Adrian, Ronald. / A report on PIV measurements in a drag-reducing turbulent flow. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED. Vol. 239 1996. pp. 101-103
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