Technique to reduce chemical usage and concomitant drift from ae

Details Technique to reduce chemical usage and concomitant drift from ae Technique to reduce chemical usage and concomitant drift from ae

1997-08-14

1999-11-02

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Processes

Including electrostatic charging

239171, 239704, 244136, A01G 2310

Patent

active

059754257

ABSTRACT:
An apparatus and method are disclosed for the aerial spraying of agricultural chemicals with improved spray deposition and reduced drift. The spraying apparatus includes two oppositely charged sets of spray nozzles which may be fitted onto an aircraft. Both sets include one or more nozzles having spraying tips which produce a hollow cone spray pattern, and at least the tips of these nozzles are constructed of a substantially non-conducting material. Cylindrical electrodes are positioned concentric to the nozzle tips for inducing an electrostatic charge upon liquid spray emitted from the nozzles. The electrodes are in turn connected to high voltage power supplies, with the electrodes corresponding to the first nozzle set being connected to a power supply of opposite potential than the electrodes corresponding the second nozzle set. Consequently, the spray issuing from the nozzle sets will be oppositely charged. For effective electrostatic aerial spraying from an aircraft, the corona discharge of the airframe must be substantially near zero. In practice, this is accomplished by maintaining equal mass flow rates of the fluid dispensed from each nozzle set, and adjusting the charging voltage of the each power supply such that the fluids provided to each nozzle set have equal charge to mass ratios which are at a level of at least 0.8 mC/kg.

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Carlton, J.B., et al., Electrostatic Charging of Aerial Spray Over Cotton, Transactions of the ASAE, 1995 American Society of Agricultural Engineers, vol. 38(6), 1641-1645.
Carlton, J.B., Techniques in Electrostatic Charging of Sprays from Aircraft, Proc. 17th Ann. Tex. Agri. Avia. Conf. And Short Course on Pest Control, Texas A&M Univ., College Station, TX, Feb. 25-27, 1968, pp. G-1-G-19.

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