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FIELD METHOD FOR THE DETERMINATION OF THE PARTICLE SIZE OF OIL MISTS
Author(s) -
JONG J. R. de
Publication year - 1950
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1950.tb00972.x
Subject(s) - fineness , materials science , nozzle , particle size distribution , particle size , drop (telecommunication) , mechanics , laboratory flask , spray characteristics , composite material , mathematics , pulp and paper industry , mineralogy , spray nozzle , mechanical engineering , physics , thermodynamics , chemistry , engineering , chemical engineering
For the control of plant pests, e.g. insects, spraying machines have of late been developed, especially in the U.S.A., with which low dosages of fairly concentrated solutions of toxicants in mineral oils are sprayed. The efficiency of such products is no doubt influenced by the fineness of the spray. An accurate method of determining this fineness was desirable both for the control of the spraying operation and for evaluation of the merits of spraying apparatus. Knowledge of the average drop size is inadequate in this respect; it is necessary to know the distribution of the oil in droplets of different sizes. A reliable impression of this percentage can be obtained only if a large number of particles are measured. These measurements can be used to plot frequency curves based on number or volume distribution. A simple microphotographic method is described whereby these measurements can be made both in the laboratory and in the field. The procedure makes it possible to obtain, shortly after spraying, a good idea of the size of the oil drops in the deposit. An apparatus was designed and constructed to determine the diameter frequency curve and the volume distribution curve of oil droplets deposited in field spraying on coated glass plates. The method gave characteristic results for field sprayings with the Strawsonizer and a helicopter fitted with a spraying boom and also in the laboratory when using a spraying apparatus with different arrangements of the nozzle.