Direct Optical Measurement of Vorticity in Fluid Flow

Abstract

Even though vorticity is one of the most important variables in fluid dynamics, we do not currently have a practical way to measure it directly and in a non-intrusive fashion. In this exploratory research effort we demonstrate the first direct and localized non-intrusive measurement of vorticity in afluid flow using the Rotational Doppler Effect (RDE) and Laguerre-Gaussian (LG) light beams that possess orbital angular momentum (OAM).The approach has been implemented in the flow field of solid body rotation where the flow vorticity is known precisely. Experimental results arefound to be in excellent agreement with the expected values.

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Document Details

Document Type
Technical Report
Publication Date
Dec 11, 2015
Accession Number
AD1001828

Entities

People

  • Manoochehr Koochesfahani
  • Marcos Dantus

Organizations

  • Michigan State University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Angular Momentum
  • Bodies
  • Doppler Effect
  • Flow
  • Flow Fields
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Frequency
  • Frequency Shift
  • Hydrodynamics
  • Laser Beams
  • Momentum
  • Optical Lattices
  • Orbital Angular Momentum
  • Scattering
  • Solid Bodies

Fields of Study

  • Physics

Readers

  • Control Systems Engineering.
  • Fluid Mechanics and Fluid Dynamics.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster