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The production of charged monodisperse fuel droplets by electrical dispersion

The electrical dispersion of a jet of kerosene into a spray of monodisperse droplets is discussed. It is found that monodisperse spraying can be achieved within a small finite range of applied voltages, within which droplet size is almost independent of voltage and is a function of the flow rate of kerosene. An approximate theory is developed which shows that the controlling parameter is the field strength at the surface of the jet, and correctly predicts the specific charge acquired by the droplets as a function of this field strength.