[Mise au point de fluides intelligents pour le contrôle de l'application de solutions vaporisées]
Les récents progrès concernant la compréhension des « fluides complexes » ont permis le développement de nouveaux additifs chimiques utilisés dans l'industrie phyto-sanitaire qui ont abouti à des produits plus efficaces et à un haut niveau de protection environnementale et publique. Nous présentons ici un exemple concernant l'amélioration de l'application des herbicides et des pesticides durant leur vaporisation sur des plantes. En choisissant judicieusement des solutions diluées de polymères, il est possible d'améliorer simultanément les caractéristiques du jet, la déposition des gouttes, et la rétention du produit sur la surface de la plante cible. L'optimisation de ces paramètres demande de trouver un équilibre entre l'hydrodynamique et les interactions moléculaires qui contrôlent le comportement des solutions vaporisées.
Recent advances in our understanding of ‘complex fluids’ have lead to the development of new chemical additives in the agricultural industry, which provide more efficient products and a higher level of public and environmental protection. Here we present one example that deals with the improved application of herbicides and pesticides during the spray treatment of plants. Using judiciously chosen dilute polymer solutions, one can simultaneously improve the spray characteristics, droplet deposition, and product retention onto the targeted plant surface. Achieving these combined benefits, requires a delicate balance between fluid hydrodynamics and the molecular interactions that control the phase behaviour of the sprayed solutions.
Mot clés : Viscosité élongationelle, Rebond de gouttes, Herbicides, Pesticides
@article{CRPHYS_2003__4_2_211_0,
author = {Vance Bergeron},
title = {Designing intelligent fluids for controlling spray applications},
journal = {Comptes Rendus. Physique},
pages = {211--219},
publisher = {Elsevier},
volume = {4},
number = {2},
year = {2003},
doi = {10.1016/S1631-0705(03)00043-4},
language = {en},
}
Vance Bergeron. Designing intelligent fluids for controlling spray applications. Comptes Rendus. Physique, Volume 4 (2003) no. 2, pp. 211-219. doi : 10.1016/S1631-0705(03)00043-4. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/S1631-0705(03)00043-4/
[1] Memoire sur la constiturion des vienes liquids lancees par des orifices circulaires en mince paroi, Ann. De Chim., Volume 53 (1883), pp. 337-387
[2] Rayleigh Lord (J.W. Strutt), Scientific Papers, Vol. 1, Cambridge University Press, London, 1899
[3] Nonlinear dynamics and breakup of free-surface flows, Rev. Modern Phys., Volume 69 (1997), pp. 865-929
[4] Breakup of a laminar capillary jet of viscoelastic fluid, J. Fluid Mech., Volume 38 (1969), pp. 689-711
[5] Stability of a viscoelastic jet, Chem. Eng. Sci., Volume 20 (1965), pp. 1037-1040
[6] Atomisation of dilute polymer solutions in agricultural spray nozzles, J. Non-Newtonian Fluid Mech., Volume 83 (1999), pp. 163-178
[7] A highly elastic constant-viscosity fluid, J. Non-Newtonian Fluid Mech., Volume 3 (1997), pp. 87-91
[8] Characterization and distribution of water-repellent self-cleaning plant surfaces, Ann. Botany, Volume 79 (1997), p. 667
[9] Phenomena of liquid drop impact on solid and liquid surface, Fluid Dyn. Res., Volume 12 (1993), pp. 61-93
[10] Dynamic surface tension effects in impact of a drop with a solid surface, J. Colloid Interface Sci., Volume 187 (1997), p. 166
[11] et al. Influence of dynamic surface tension on the spreading of surfactant solution droplets impacting onto a low-surface-energy solid substrate, J. Colloid Interface Sci., Volume 192 (1997), p. 129
[12] Controlling droplet deposition with polymer additives, Nature, Volume 405 (2000), p. 772
[13] Influence of fluid elasticity on drops impacting on dry surfaces, J. Rheol., Volume 44 (2000), pp. 973-996
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