Volumetric validation of mass balance using a computational phase Doppler approach for disc core nozzles

Roten, R. L., Post, S. L., Werner, A., Hewitt, A. J. and Safa, M. (2016) Volumetric validation of mass balance using a computational phase Doppler approach for disc core nozzles. Crop Protection, 79 128-134. doi:10.1016/j.cropro.2015.10.018

Author Roten, R. L.
Post, S. L.
Werner, A.
Hewitt, A. J.
Safa, M.
Title Volumetric validation of mass balance using a computational phase Doppler approach for disc core nozzles
Journal name Crop Protection   Check publisher's open access policy
ISSN 0261-2194
Publication date 2016-01-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.cropro.2015.10.018
Open Access Status Not Open Access
Volume 79
Start page 128
End page 134
Total pages 7
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Collection year 2017
Language eng
Formatted abstract
The mass balance of orchard air-blast sprayers has historically been assessed using an array of samplers to capture airborne particles. However, these methods only provide an idea of flux with no other information which is pertinent to understand the movement of droplets and their potential to drift. While droplet analysis for agricultural sprayers has always been conducted in a laboratory setting with the use of laser devices, a new phase Doppler approach is being explored to assess droplet spectra, velocity, and flux in outdoor field conditions. Therefore it is the objective of this study to develop a methodology and the potential limitations for using a phase Doppler system while in a laboratory setting. Due to the expected variability of field conditions as well as the turbulence of orchard sprayers, a computational approach was sought to assess flux from a single scan of a conical spray plume's diameter. Using a constant scanning speed of 0.0079 m/s, a disc core (D1/DC33) hollow cone nozzle was examined at 310, 410, and 520 kPa pressure at five different heights (10, 20, 30, 40, and 50 cm). Computational flux was then compared to the actual flow rate, finding a −3.3% average error with a range of −16.9% and 4.7% illustrating a small underestimation of mass with the phase Doppler which was related to distance and droplet frequency. Further, comparisons were also assessed including pattern/symmetry, droplet spectra, velocity, and the overall number of samples. The proposed methodology indicates potential for the use of phase Doppler technology for in situ measurements of spray equipment using a conical-type spray nozzle, such as that of the orchard air-blast sprayer.
Keyword Droplet spectra
Phase Doppler interferometer
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Agriculture and Food Sciences
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