Abstract
ABSTRACT THIS paper describes a method for induction-charging the spray from a spinning disc atomizer. Wetting of the induction electrode is avoided by rotating it with the atomising disc. An analysis shows that the charge to mass ratio should be proportional to the electrode voltage and can be reduced by the space charge in the cloud of spray surrounding the disc. Measurements show that the space charge effect is negligible whereupon the analysis yields simple formulae. These formulae predict that the charge to mass ratio is also proportional to the disc rotational speed, and measurements confirm this up to the point when the air between the electrode and the liquid at the disc edge ionizes. Particular formulae are given relating the charge to mass ratio to the electrode voltage and rotational speed for two values of electrode to disc spacing..
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