Accession Number : ADP005898

Title :   Flow Velocity Measurements by Image Processing of Optically Modulated Traces,

Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA

Personal Author(s) : Gharib, M. ; Dyne, B. ; Thomas, O. ; Yap, C.

Report Date : JUN 1987

Pagination or Media Count : 8

Abstract : A computerized flow visualization technique capable of quantifying the flow field automatically is described. The technique uses a time modulated illumination scheme to retrieve vectorial information from the pathlines of particles suspended in the flow. This technique has eliminated a major source of error in velocity reading which is common in conventional particle tracing techniques. Application of the present technique to the recirculating flow field of a two dimensional cavity is described. Velocity profiles obtained from the pathlines of the particles through the present technique show excellent agreement with the velocity profiles obtained using laser doppler velocimetry.

Descriptors :   *FLOW VISUALIZATION, IMAGE PROCESSING, FLOW FIELDS, RECIRCULATION, COMPUTER APPLICATIONS, SUSPENDED SEDIMENTS, CAVITIES, PARTICLES, PATHS, VELOCITY, TIME, MODULATION, OPTICAL TRACKING, AUTOMATION.

Subject Categories : Fluid Mechanics
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE