Impaction of spray droplets on leaves: Influence of formulation and leaf character on shatter, bounce and adhesion

Dorr, Gary J., Wang, Shuangshuang, Mayo, Lisa C., McCue, Scott W., Forster, W. Alison, Hanan, Jim, & He, Xiongkui (2015) Impaction of spray droplets on leaves: Influence of formulation and leaf character on shatter, bounce and adhesion. Experiments in Fluids, 56(7), pp. 143-1.

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Abstract

This paper combines experimental data with simple mathematical models to investigate the influence of spray formulation type and leaf character (wettability) on shatter, bounce and adhesion of droplets impacting with cotton, rice and wheat leaves. Impaction criteria that allow for different angles of the leaf surface and the droplet impact trajectory are presented; their predictions are based on whether combinations of droplet size and velocity lie above or below bounce and shatter boundaries. In the experimental component, real leaves are used, with all their inherent natural variability. Further, commercial agricultural spray nozzles are employed, resulting in a range of droplet characteristics. Given this natural variability, there is broad agreement between the data and predictions. As predicted, the shatter of droplets was found to increase as droplet size and velocity increased, and the surface became harder to wet. Bouncing of droplets occurred most frequently on hard to wet surfaces with high surface tension mixtures. On the other hand, a number of small droplets with low impact velocity were observed to bounce when predicted to lie well within the adhering regime. We believe this discrepancy between the predictions and experimental data could be due to air layer effects that were not taken into account in the current bounce equations. Other discrepancies between experiment and theory are thought to be due to the current assumption of a dry impact surface, whereas, in practice, the leaf surfaces became increasingly covered with fluid throughout the spray test runs.

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4 citations in Scopus
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3 citations in Web of Science®

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ID Code: 84788
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: droplet impaction, spray formulation, leaf wettability, shatter, bounce, adhere, spray adjuvants, agrichemical spray nozzles
DOI: 10.1007/s00348-015-2012-9
ISSN: 1432-1114
Subjects: Australian and New Zealand Standard Research Classification > MATHEMATICAL SCIENCES (010000) > APPLIED MATHEMATICS (010200) > Theoretical and Applied Mechanics (010207)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > INTERDISCIPLINARY ENGINEERING (091500) > Fluidisation and Fluid Mechanics (091504)
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Past > Schools > Mathematical Sciences
Funding:
Copyright Owner: Copyright 2015 Springer Verlag
Copyright Statement: The final publication is available at Springer via http://dx.doi.org/10.1007/s00348-015-2012-9
Deposited On: 01 Jul 2015 23:22
Last Modified: 08 Aug 2016 06:30

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