ELECTRICAL SPRAYING OF MACROSCOPIC LIQUID PARTICLES UNDER PULSED CONDITIONS,
ILLINOIS UNIV URBANA CHARGED PARTICLE RESEARCH LAB
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The work pertains to the production of electrically charged macroscopic liquid particles by means of electrical spraying. An historical treatment is used to point out that an important application of electrical spraying is in the electrical propulsion field. It was found that glycerine, Octoil, and Octoil doped with tetra-n-butylammonium picrate readily spray from the end of a fine capillary, maintained at a high d-c potential, in short periodic bursts which continue over a prolonged time interval of at least several hours. New techniques are presented for determining the specific-charge spectra of the droplets emitted in selected intervals during the spraying pulses by time-offlight mass spectrometry, and for taking photomicrographs of the liquid surface at any instant before, during, and after the spraying pulses. A method for synchronizing the spraying to an external pulser is indicated. Calculations based on considerations of the time intervals between spraying pulses, their widths, and period-to-width ratios are compared with measured values and reasonable agreement is achieved.