Deposition studies of a hand-held air-assisted electrostatic sprayer
1996
Gupta, C.P. | Duc, T.X.
Laboratory experiments were carried out to determine spray distribution pattern and deposition characteristics of an air-assisted, electrostatic, spinning disc sprayer at various conditions. Spray distribution patterns were obtained with the aid of a patternator. Fluorometric analysis quantified tracer deposit on different levels of the soybean plants. Parameters studied were disc rotational speed, liquid flow rate, fan speed, tilt angle between disc plane and air stream direction. When electrode voltage was maintained at 2.5 kV the results indicated that the ratio of deposition density of air-assisted and non air-assisted application at top, middle, and bottom levels were 1.38, 1.37, and 1.5 fold, respectively. Mean deposition on plant target increased 1.44 fold due to air assistance. The leaf underside deposition occupied 27% of the total deposition. It increased 7% over that of the electrostatic unit because of air assistance. The optimum tilt angle between disc plane and air stream direction was found to be 105 degrees.
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