INVESTIGATION OF ELECTRIFICATION OF POWDERS IN FLOW THROUGH TUBES AND NOZZLES. II. CHARGE ANALYSES OF DEAGGLOMERATED POWDERS
AEROJET-GENERAL CORP DOWNEY CA
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Charge measurements were conducted with airborne powders flowing out of a capillary tube at flow rates between 100 and 500 ccmin. corresponding to 3 and 15 ms linear flow rate. The relative humidity of the air was 10. The powders were saccharin, Carbowax 6000, Cab-o-Sil, and the two former materials with 1 of Cab-o-Sil as a deagglomerant. The MMD particle sizes were 7, 14, and 0.02 micron respectively. The dependence of the positive and negative charges per gram of material and of the abundances of positively and negatively charged material upon the flow rate were determined. The bearing of these quantities upon agglomeration is discussed with respect to flowing powders and aerosols. The effects of the deagglomerant are different in the two cases and depend upon the nature of the powder and upon the flow rate. It is concluded that a deagglomerant may be effective as a free-flowing agent by causing large agglomerates, although smaller than those in the pure material, and by causing nearly equal abundances of positive and negative particles. Both effects are ruinous to presized aerosol material.
- Electricity and Magnetism
- Fluid Mechanics