Accession Number : AD0285385

Title :   USE OF ELECTROCHEMILUMINESCENCE FOR VISUALIZING FIELDS OF FLOW

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS

Personal Author(s) : HOWLAND,BRADFORD ; PITTS,WALTER H. ; GESTELAND,ROBERT C.

Report Date : 21 SEP 1962

Pagination or Media Count : 28

Abstract : A platinum hydrofoil is immersed in a flowing, alka ine solution containing luminol (5-amino2,3-dihydro-1,4-phthalazinedione) and H2O2. Anodic current, replacing the usual chemical catalysis, generates a bright surface glow with intensity distribution controlled by mass transfer. This displays the flow at the boundary layer without disturbing it. A methanolic solution shows also the flow behind the hydrofoil; the luminescence leaves the anode and extends downstream for a distance determined by the acidity. The subsequent history of parcels of fluid passing by any part of the hydrofoil can thus be traced. Fluid may be recirculated; operation with organic solvents of low kinematic viscosity is possible. Laminar and turbulent boundary layers, various wakes, and vortex streets are illustrated. (Author)

Descriptors :   *FLUID FLOW, *LUMINESCENCE, BOUNDARY LAYER, ELECTROCHEMISTRY, HYDROFOILS, TEST METHODS, VIABILITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE