Spray current dependence on flow rate and conductivity in cone-jet mode vacuum spraying

K. L. Smith, J. P W Stark

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Experiments have been performed to investigate the properties of an electrospray in cone-jet mode under vacuum conditions. The total spray current was measured as a function of liquid flow rate for various values of solution conductivity. The solution used was Triethylene Glycol, (TEG), doped with Sodium Iodide, (NaI). Several NaI concentrations were used to achieve a range of conductivities between 10 and 100 μS/cm. The solution was sprayed from a stainless steel capillary. Preliminary analysis from this experimental investigation has revealed a dependence of the current-flow rate, I(Q), characteristics upon conductivity, K.κ Our data is consistent with a power law relationship for I(Q), however the best-fit exponent decreases with increasing conductivity. Our results also indicate a dependence of the total beam emitted spray current, I, on the applied voltage, Vapp. Crucial to our work has been the development of a non-invasive, online system for continuous monitoring of the low flow rates associated with the high conductivity fluids we have used. With this flow measurement system, we can measure flow rates in the capillary-vacuum system to an accuracy of lnls -1.
    Original languageEnglish
    Pages (from-to)161-166
    Number of pages5
    JournalInstitute of Physics Conference Series
    Volume178
    Publication statusPublished - 2004

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