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Wind tunnel flux comparisons using a phase Doppler interferometer

Roy L. Roten1*, Scott L. Post1, Armin Werner1, Majeed Safa2, Andrew J. Hewitt3

1Department of Precision Application, Lincoln Agritech Ltd., P.O. Box 69133, Lincoln, Christchurch 7640, New Zealand
2Department of Commerce, Lincoln University, P.O. Box 7647, Lincoln, Christchurch 7647, New Zealand
3School of Agriculture and Food Science, The University of Queensland, Gatton QLD 4343, Australia

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Received: June 19, 2017
Accepted: September 12, 2017

Abstract

It is essential to know the movement of droplets in time and space (i.e. flux) when measuring and/or predicting spray drift in agricultural application. A study was performed to assess the flux measurements of a phase Doppler system against a standard monofilament system in a wind tunnel. The primary objectives of the study were to compare flux from a new phase Doppler system against 1.7 mm cotton and 2.0 mm nylon strings at varying wind speeds (1.4, 4.2, 8.3, 12.5, and 16.7 m ⋅ s–1) and spray exposures times (5, 10, 15, 30, and 60 s) with an overarching hypothesis that the active, phase Doppler is able to accurately measure the flux regardless of exposure and spray mass whereas the static string samplers are limited to a maximum retention. The phase Doppler did measure linearly as expected, however strings did not reach a point in which they loss mass; conversely, they appeared to overload with saturation. These findings are believed to be among many variables which influence the variability of previous mass balance studies.

Key words: flux monofilament system, phase Doppler system, wind tunnel

 
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