Experimental Study of Turbulent Spots.

Abstract

A novel visualization technique that utilizes fluorescent dye excited by a sheet of laser light is employed to study turbulent spots evolving in an unstable laminar boundary layer. The large growth rates of the spot in the spanwise direction cannot be explained by classical entrainment. It is suggested that a new mechanism, termed 'destabilization,' accounts for the larger growth rates. Growth by destabilization appears to be the result of the turbulence inducing perturbation into the nearby unstable boundary layer. This disturbance grows and breaks down, thus forming the new turbulence in the spot. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1981
Accession Number
ADA102224

Entities

People

  • Mohamed Gad-el-hak

Tags

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Boundaries
  • Boundary Layer
  • Dyes
  • Flow
  • Flow Fields
  • Flow Visualization
  • Fluorescent Dyes
  • Laminar Boundary Layer
  • Layers
  • Solenoid Valves
  • Transitions
  • Turbulence
  • Turbulent Flow
  • Universities
  • Visualizations

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.

Technology Areas

  • Directed Energy