Abstract

Experiments are described which were designed to investigate a suggestion that the observed small penetrations of rotary impaction filters by mists are due to the break-up of larger drops in the immediate vicinity of the filter wires by aerodynamic drag forces. No supporting evidence has been found, however, a result shown to be consistent with the conditions necessary for the fragmentation of raindrops. It is therefore concluded that, contrary to the earlier hypothesis, drop fragmentation is not responsible for the small residual penetrations of the filters that have been observed.

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