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There is often great difficulty in measuring mean droplet size
and drop size distribution in sprays because of sampling problems. This
is particularly true if the spray is produced in the practical environment,
for example in a high pressure combustion chamber, and the spray density
is high. In recent years there has been a greater need to evaluate the
characteristics of atomisers under such conditions and hence greater
interest shown in optical methods which present the most convenient
means for examining spray characteristics.
It is not intended in this brief note to discuss in detail the
principles involved with diffractive scattering methods of measuring mean
droplet size, - this has been done very effectively elsewhere - but merely
to outline some of the practicalities of producing a reliable instrument
based on one method which has considerable promise. One of the early
papers describing and evaluating this method was published by Dobbins,
Crocco and Glassman in 1963, but the theoretical background on which the
method is based was available much earlier … [cont.]. |
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