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Interfacial Phenomena and Heat Transfer
ESCI SJR: 0.146

ISSN Imprimer: 2169-2785
ISSN En ligne: 2167-857X

Open Access

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2014010162
pages 1-14

MODELLING THE FLOW OF DROPLETS OF BIO-PESTICIDE ON FOLIAGE

Sergii Veremieiev
School of Engineering, Technology, and Maritime Operations, Liverpool John Moores University, Liverpool, L3 3AF, United Kingdom
A. Brown
BASF Agricultural Specialities, Ltd., Harwood Industrial Estate, Harwood Road, Littlehampton West Sussex, BN17 7AU, United Kingdom
P. H. Gaskell
School of Engineering and Computing Sciences, Durham University, Durham, DH1 3LE, United Kingdom
C. R. Glass
Food and Environment Research Agency, Sand Hutton, York, YO411LZ, United Kingdom
N. Kapur
School of Mechanical Engineering, University of Leeds, Leeds, LS2 9JT, United Kingdom
H. M. Thompson
Institute of Engineering Thermofluids, Surfaces and Interfaces, School of Mechanical Engineering, University of Leeds, Leeds, LS2 9JT, United Kingdom

RÉSUMÉ

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.


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