Continuous Recording of H2O Spray Spot Images Across the Sprayed Swath on 35-mm Film1

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A technique for recording water spray spot images continuously across a spray swath on 35-mm film is described. Although the technique was developed for aerial-spraydeposit studies. it can be used in studies of much narrower swaths.

One hundred- foot lengths of 35-mm film were specially prepared as the spray sampling surface. The spray solution of H20 and black Nigrosine dye was sprayed over the film. Specially prepared film holders were made to hold the film, and spray passes were made flying at right angles to the film sampling line. The sprayed sample was printed by a 35-mm motion-picture contact printer. After the print was developed, a small. compact, permanent copy of the spray deposit was available for study of drop sizes. An empirical relation was derived to express the spherical drop diameter as a function of the spot diameter on the film.

Document Type: Research Article

Publication date: June 1, 1967

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