USE OF ELECTROCHEMILUMINESCENCE FOR VISUALIZING FIELDS OF FLOW
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 21, 1962
- Accession Number
- AD0285385
Entities
People
- Bradford Howland
- Robert C. Gesteland
- Walter H. Pitts
Organizations
- Massachusetts Institute of Technology