Simultaneous Whole-Field Measurements of Velocity and Concentration Fields Using Combined MTV and LIF

Abstract

A new technique is described for the simultaneous measurement of velocity and concentration fields. We describe here applications in liquid-phase flows, but the methodology can be extended to gas-phase flows with appropriate tracers. In this single-laser, two-tracer approach, molecular tagging velocimetry (MTV) based on a phosphorescent compound is combined with laser induced fluorescence (LIF) using fluorescein as tracer. Results show that one can design experiments with minimal cross-talk between the LIF and MTV signals. Application of the simultaneous MTV-LIF technique is demonstrated by performing simultaneous flow visualization and vorticity measurements in a low Reynolds number forced wake and simultaneous velocity-concentration measurements in a turbulent mixing layer. Preliminary data are presented on the mean and rms fluctuation of velocity and concentration, along with the correlation between velocity and concentration fluctuations.

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Document Details

Document Type
Technical Report
Publication Date
Jan 07, 2000
Accession Number
ADA397979

Entities

People

  • Colin Mackinnon
  • Manoochehr Koochesfahani
  • Richard Cohn

Organizations

  • Michigan State University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Detectors
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Free Stream
  • Hydrodynamics
  • Laser Dyes
  • Laser Induced Fluorescence
  • Measurement
  • Optics
  • Reynolds Number
  • Stratified Fluids
  • Turbulent Flow
  • Turbulent Mixing
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Fluid Mechanics and Fluid Dynamics.

Technology Areas

  • Directed Energy