A mechanism for drag reduction based on stress relaxation.

S. M. Penix, C. A. Petty

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

A theoretical analysis of turbulent drag reduction by polymer additives assumes that dilute polymer solutions are viscoelastic and transport momentum at finite speeds. Transport effects are predicted in terms of known turbulent properties of Newtonian fluids. The Reynolds' stress depends on two distinct physical processes: the space time relaxation of molecular transport due to viscous and elastic effects and the space time relaxation for velocity fluctuations normal to the wall. Because of the finite memory of turbulent correlations near a rigid boundary, the short time elastic response of the fluid controls the molecular transport contribution to the Reynolds stress. The theory predicts all the major features of the drag reduction phenomenon. (A)

Original languageEnglish (US)
Title of host publicationUnknown Host Publication Title
PublisherMissouri Univ
StatePublished - 1986
Externally publishedYes

Profile

Drag reduction
Relaxation time
Fluids
Stress relaxation
Polymer solutions
Momentum
Polymers

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Penix, S. M., & Petty, C. A. (1986). A mechanism for drag reduction based on stress relaxation. In Unknown Host Publication Title Missouri Univ.

A mechanism for drag reduction based on stress relaxation. / Penix, S. M.; Petty, C. A.

Unknown Host Publication Title. Missouri Univ, 1986.

Research output: Chapter in Book/Report/Conference proceedingChapter

Penix, SM & Petty, CA 1986, A mechanism for drag reduction based on stress relaxation. in Unknown Host Publication Title. Missouri Univ.
Penix SM, Petty CA. A mechanism for drag reduction based on stress relaxation. In Unknown Host Publication Title. Missouri Univ. 1986.

Penix, S. M.; Petty, C. A. / A mechanism for drag reduction based on stress relaxation.

Unknown Host Publication Title. Missouri Univ, 1986.

Research output: Chapter in Book/Report/Conference proceedingChapter

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