The scaling of the wall pressure flunctuations in polymer-modified turbulent boundary layer flow

Timothy A. Brungart, Wayne J. Holmberg, Arnold Anthony Fontaine, Steven Deutsch, Howard L. Petrie

Research output: Contribution to journalReview article

9 Citations (Scopus)

Abstract

Wall pressure fluctuations and integrated skin friction were measured beneath a turbulent boundary layer that was modified by adding drag-reducing polymer to the pure water flow. The measurements were performed on an axisymmetric model, equipped with an isolated cylindrical drag balance section, and placed in the test section of the 0.3048-m-diam water tunnel at ARL Penn State. Data were acquired at a free-stream velocity of 10.7 m/s with pure water and with polymer added to the water at concentrations of 1, 5, 10, and 20 weight parts per million. Nondimensionalization of the wall pressure fluctuation frequency spectra with traditional outer, inner, and mixed flow variables failed to adequately collapse the data. The mean square wall pressure fluctuations were found to scale linearly with the wall shear stress. Polymer addition had little effect on the characteristic time scale of the flow. These properties were used to develop a novel form of the nondimensional wall pressure fluctuation spectrum that provided the best collapse of the measured data. (C) 2000 Acoustical Society of America.

Original languageEnglish (US)
Pages (from-to)71-75
Number of pages5
JournalJournal of the Acoustical Society of America
Volume108
Issue number1
DOIs
StatePublished - Jul 27 2000

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wall pressure
boundary layer flow
turbulent boundary layer
scaling
polymers
drag balance
hydraulic test tunnels
multiphase flow
skin friction
water flow
free flow
water
shear stress
drag
Fluctuations
Scaling
Water
Layer
Polymers

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

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abstract = "Wall pressure fluctuations and integrated skin friction were measured beneath a turbulent boundary layer that was modified by adding drag-reducing polymer to the pure water flow. The measurements were performed on an axisymmetric model, equipped with an isolated cylindrical drag balance section, and placed in the test section of the 0.3048-m-diam water tunnel at ARL Penn State. Data were acquired at a free-stream velocity of 10.7 m/s with pure water and with polymer added to the water at concentrations of 1, 5, 10, and 20 weight parts per million. Nondimensionalization of the wall pressure fluctuation frequency spectra with traditional outer, inner, and mixed flow variables failed to adequately collapse the data. The mean square wall pressure fluctuations were found to scale linearly with the wall shear stress. Polymer addition had little effect on the characteristic time scale of the flow. These properties were used to develop a novel form of the nondimensional wall pressure fluctuation spectrum that provided the best collapse of the measured data. (C) 2000 Acoustical Society of America.",
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The scaling of the wall pressure flunctuations in polymer-modified turbulent boundary layer flow. / Brungart, Timothy A.; Holmberg, Wayne J.; Fontaine, Arnold Anthony; Deutsch, Steven; Petrie, Howard L.

In: Journal of the Acoustical Society of America, Vol. 108, No. 1, 27.07.2000, p. 71-75.

Research output: Contribution to journalReview article

TY - JOUR

T1 - The scaling of the wall pressure flunctuations in polymer-modified turbulent boundary layer flow

AU - Brungart, Timothy A.

AU - Holmberg, Wayne J.

AU - Fontaine, Arnold Anthony

AU - Deutsch, Steven

AU - Petrie, Howard L.

PY - 2000/7/27

Y1 - 2000/7/27

N2 - Wall pressure fluctuations and integrated skin friction were measured beneath a turbulent boundary layer that was modified by adding drag-reducing polymer to the pure water flow. The measurements were performed on an axisymmetric model, equipped with an isolated cylindrical drag balance section, and placed in the test section of the 0.3048-m-diam water tunnel at ARL Penn State. Data were acquired at a free-stream velocity of 10.7 m/s with pure water and with polymer added to the water at concentrations of 1, 5, 10, and 20 weight parts per million. Nondimensionalization of the wall pressure fluctuation frequency spectra with traditional outer, inner, and mixed flow variables failed to adequately collapse the data. The mean square wall pressure fluctuations were found to scale linearly with the wall shear stress. Polymer addition had little effect on the characteristic time scale of the flow. These properties were used to develop a novel form of the nondimensional wall pressure fluctuation spectrum that provided the best collapse of the measured data. (C) 2000 Acoustical Society of America.

AB - Wall pressure fluctuations and integrated skin friction were measured beneath a turbulent boundary layer that was modified by adding drag-reducing polymer to the pure water flow. The measurements were performed on an axisymmetric model, equipped with an isolated cylindrical drag balance section, and placed in the test section of the 0.3048-m-diam water tunnel at ARL Penn State. Data were acquired at a free-stream velocity of 10.7 m/s with pure water and with polymer added to the water at concentrations of 1, 5, 10, and 20 weight parts per million. Nondimensionalization of the wall pressure fluctuation frequency spectra with traditional outer, inner, and mixed flow variables failed to adequately collapse the data. The mean square wall pressure fluctuations were found to scale linearly with the wall shear stress. Polymer addition had little effect on the characteristic time scale of the flow. These properties were used to develop a novel form of the nondimensional wall pressure fluctuation spectrum that provided the best collapse of the measured data. (C) 2000 Acoustical Society of America.

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