Instrumented wind tunnel for spray drift studies
Date
1996-02-22
Authors
Farooq, M.
Wulfsohn, D.
Ford, R.J.
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An instrumented wind tunnel was developed to study the drift from sprayer nozzles under controlled and repeatable environmental and spraying conditions. The wind tunnel has a 1 m2 cross section and a 4 meter long testing section. Wind speed and wind direction, nozzle operating pressure, flow rate and height can be controlled and measured while relative humidity and temperature is recorded. An image of the spray sheet frozen against a matt black background is obtained on Black & White film using a series of electronic flashes and a 35 mm SLR camera set to an aperture of 5.6. A flat fan nozzle was tested at wind speeds of 0, 1.4, 2.8 and 4.2 m/s and operating pressures of 205, 275 and 345 kPa with 3 replicates. Analysis of the images of the spray sheet revealed that the system responded in a meaningful way to changes in environmental and spray parameters. It was confirmed that the wind tunnel was able to produce repeatable conditions.
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Soils and Crops Workshop