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Modelling the flow of droplets of bio-pesticide on foliage

Veremieiev, S.; Brown, A.; Gaskell, P.H.; Glass, C.R.; Kapur, N.; Thompson, H.M.

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Authors

A. Brown

C.R. Glass

N. Kapur

H.M. Thompson



Abstract

The flow of droplets of bio-pesticide, liquid laden with entomapathogenic nematodes (EPNs), over foliage approximated as a planar substrate is investigated theoretically via a simple analytical model and computationally by solving a subset of the Navier-Stokes equations arising from application of the long-wave approximation. That the droplets of interest can be represented as a homogeneous liquid is established via complementary experiments revealing the presence of EPNs to have negligible influence on bio-pesticide droplet spray distribution predeposition. Both approaches are used to study key issues affecting the migration of droplets over substrates relevant to pesticide deposition processes, including the effect (i) of droplet size and flow inertia on droplet morphology and coverage and (ii) of adaxial (above the leaf) or abaxial (under the leaf) flow orientations. The computational results obtained when inertia is accounted for are generally found to compare well with those given by the simple analytical model − a droplet's velocity relaxes to its terminal value very quickly, at which point gravitational, viscous, and hysteresis forces are in balance; substrate orientation is found to have only a minor influence on the extent of droplet migration.

Citation

Veremieiev, S., Brown, A., Gaskell, P., Glass, C., Kapur, N., & Thompson, H. (2014). Modelling the flow of droplets of bio-pesticide on foliage. Interfacial phenomena and heat transfer, 2(1), 1-14. https://doi.org/10.1615/interfacphenomheattransfer.2014010162

Journal Article Type Article
Online Publication Date May 21, 2014
Publication Date Feb 1, 2014
Deposit Date Jan 26, 2015
Publicly Available Date Aug 25, 2015
Journal Interfacial phenomena and heat transfer
Print ISSN 2169-2785
Publisher Begell House
Peer Reviewed Peer Reviewed
Volume 2
Issue 1
Pages 1-14
DOI https://doi.org/10.1615/interfacphenomheattransfer.2014010162
Keywords –íroplets, Fluidflow, Experiments, Analysis, Computations, Bio-pesticide.

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