Studies of the Wall Shear Stress in a Turbulent Pulsating Pipe Flow

Abstract

Measurements are presented of the time variation of the wall shear stress caused by the imposition of a sinusoidal oscillation on a turbulent pipe flow. The amplitude of the oscillation is small enough that a linear response is obtained and the dimensionless frequency, omega +, is large compared to that studied by most previous investigators. The most striking feature of the results is a relaxation effect, similar to what has been observed for flow over a wavy surface, whereby the phase angle characterizing the temporal variation of the wall shear stress undergoes a sharp change over a rather narrow range of omega +. At omega + larger than the median frequency of the turbulence there appears to be an interaction between the imposed flow oscillation and the turbulence fluctuations in the viscous sublayer, which is not described by present theories of turbulence.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1984
Accession Number
ADA146772

Entities

People

  • Thomas J. Hanratty
  • Zhuo-xiong Mao

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Chemical Engineering
  • Computational Fluid Dynamics
  • Fluid Dynamics
  • Fluid Mechanics
  • Hydrodynamics
  • Jet Propulsion
  • Measurement
  • Mechanical Engineering
  • Mechanical Properties
  • Mechanics
  • Military Research
  • Naval Architecture
  • Physics Laboratories
  • Reynolds Number
  • Steady Flow
  • Turbulent Mixing

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Plasma Physics / Magnetohydrodynamics