A new method for non-disturbing turbulent flow measurements very close to a wall

✍ Scribed by A.T. Popovich; R.L. Hummel

• Publisher: Elsevier Science
• Year: 1967
• Tongue: English
• Weight: 395 KB
• Volume: 22
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(67)80100-3

✦ Synopsis

A general flash photolysis method suitable for various non-disturbing turbulent flow measurements very close to a wall of any shape has been developed. A very dilute solution of 2-(2, 4dinitro-benzyl)-pyridine in 95 per cent ethyl alcohol is employed. A tracer, in the form of a blue line, is introduced upon the exposure of the solution to the high intensity light beam formed by a parabolic mirror. The colour is due to a tautomeric shift in the structure of the dissolved substance. The tracer is recorded photographically after an increment of time has elapsed since its formation.