A STUDY OF THE STRUCTURE OF THE TURBULENT BOUNDARY LAYER WITH AND WITHOUT LONGITUDINAL PRESSURE GRADIENTS

Abstract

The existence of three regions of the turbulent boundary layer, each correlating with a distinct part of the non-dimensional mean velocity profile, was confirmed; these are: (a) wake or intermittent region (b) fully turbulent region (c) wall layer region. Details of the flow structure of these regions were further verified using a new hot-wire anemometer and an improved combined-time-streak marker hydrogen-bubble technique. Instantaneous spanwise velocity profiles over a large extent of the flow at many fixed y-positions across the layer were obtained. The study of the flow structure was extended to include both positive and negative pressure gradient flows, including a relaminarization flow. The hot-wire anemometer provided a means of obtaining detailed mean velocity profiles well within the sublayer region. The hydrogen-bubble combined-time streak marker visualization technique was shown to be a useful tool for quantitative measurement of time-dependent velocity fields.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1965
Accession Number
AD0646989

Entities

People

  • F. A. Schraub
  • Stephen Jay Kline

Organizations

  • Stanford University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Anemometers
  • Boundary Layer
  • Boundary Layer Flow
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Mechanics
  • Hot Wire
  • Hot Wire Anemometers
  • Information Science
  • Measurement
  • Mechanics
  • Probability Density Functions
  • Statistical Analysis
  • Stratified Fluids
  • Turbulence
  • Turbulent Boundary Layer
  • Turbulent Flow

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.