A Laser-Induced Fluorescence Technique for Measurement of Slot-Injected Fluid Concentration Profiles in a Plate Turbulent Boundary Layer

Abstract

A technique for measuring near instantaneous concentration profiles of a fluid injected through a narrow inclined slot at the wall into a high unit Reynolds turbulent boundary layer is discussed. The concentration profiles are determined by measuring the light intensity emitted from a fluorescent dye premixed into the injectant flow as the injectant convects through an excitation laser beam. The fluorescence intensity is quantified by an electronically shuttered single stage microchannel plate image intensifier coupled to a linear photodiode array. This high resolution technique is being used to study the diffusion of injected polymer solutions away from the near wall region in a flat plate turbulent boundary layer where these solutions are effective in reducing drag. Keywords: Reynolds turbulent boundary layer.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1990
Accession Number
ADA221388

Entities

People

  • H. L. Petrie
  • T. A. Brungart

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Advanced Electronics
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Boundary Layer
  • Diffusion
  • Electro-Optics
  • Electronics
  • Fluorescent Dyes
  • Laser Beams
  • Laser Induced Fluorescence
  • Lasers
  • Measurement
  • Microchannel Plates
  • Optics
  • Quantum Yields
  • Radiation
  • Reynolds Number
  • Turbulent Boundary Layer
  • Turbulent Flow
  • Turbulent Mixing

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Fluid Dynamics.
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy
  • Microelectronics