Abstract

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, 4-dinitro-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.

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