The efficacy of pesticide sprays is strongly dependent on the accuracy of the droplet size spectrum. Over estimates of droplet size may result in excessive drift or ineffective doses, while under estimates of droplet size result in excessive releases. This situation is not only bad for the environment; it incurs large operating costs (spray usually accounts for 30% of total cost). This paper describes the study of droplet sprays commonly used in the agriculture and forestry management. It combines experimental wind tunnel testing and Computational Fluid Dynamic (CFD) methods to develop a fundamental understanding of droplet generation and dispersion in the wake of the atomizer spray system. The results will assist designers of spray technology and applicators in delivering pesticide to its target. The CFD models that are developed and calibrated will further allow the wind tunnel data to be generalized; thus, allowing less wind tunnel testing and eventually direct simulation of droplet dispersion in aircraft wakes. The CFD models are developed for the poly-dispersed sprays released from a Micronair AU4000 atomizer (a standard atomizer used for forest protection) at an airspeed of 67 m/s. Simulations are performed using a Lagrangian (droplet phase) - Eulerian (fluid phase) procedure and include droplet drag/body forces and turbulent dispersion of droplets. The Base-line Reynolds Stress Model (BSL RSM) turbulence model is used to compute turbulence levels in the air phase. The CFD simulations include the sprayer and a large portion of the wind tunnel geometry in order to facilitate in validation. The computational results are compared to full scale experimental measurements of pressure, gas phase velocity, droplet velocity, and droplet size spectra measured using Phase Doppler Interferometry (PDI) and Hotwire Anemometry. Measurements are available along radial lines at 0.5, 1, 2 and 4 m downstream of the atomizer.
Skip Nav Destination
ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels
August 1–5, 2010
Montreal, Quebec, Canada
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4948-4
PROCEEDINGS PAPER
Computational Study of Aerial Sprays Used for Forest Protection
Sydney D. Ryan,
Sydney D. Ryan
University of New Brunswick, Fredericton, NB, Canada
Search for other works by this author on:
Andrew G. Gerber,
Andrew G. Gerber
University of New Brunswick, Fredericton, NB, Canada
Search for other works by this author on:
Gorden A. L. Holloway,
Gorden A. L. Holloway
University of New Brunswick, Fredericton, NB, Canada
Search for other works by this author on:
Ali Bagherpour
Ali Bagherpour
University of New Brunswick, Fredericton, NB, Canada
Search for other works by this author on:
Sydney D. Ryan
University of New Brunswick, Fredericton, NB, Canada
Andrew G. Gerber
University of New Brunswick, Fredericton, NB, Canada
Gorden A. L. Holloway
University of New Brunswick, Fredericton, NB, Canada
Ali Bagherpour
University of New Brunswick, Fredericton, NB, Canada
Paper No:
FEDSM-ICNMM2010-30270, pp. 157-166; 10 pages
Published Online:
March 1, 2011
Citation
Ryan, SD, Gerber, AG, Holloway, GAL, & Bagherpour, A. "Computational Study of Aerial Sprays Used for Forest Protection." Proceedings of the ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C. Montreal, Quebec, Canada. August 1–5, 2010. pp. 157-166. ASME. https://doi.org/10.1115/FEDSM-ICNMM2010-30270
Download citation file:
9
Views
Related Proceedings Papers
Related Articles
RANS Simulations of a Simplified Tractor/Trailer Geometry
J. Fluids Eng (September,2006)
The Modeling of Lift and Dispersion Forces in Two-Fluid Model Simulations of a Bubbly Jet
J. Fluids Eng (July,2004)
A Comparison of Single and Multiphase Jets in a Crossflow Using Large Eddy Simulations
J. Eng. Gas Turbines Power (January,2007)
Related Chapters
Antilock-Braking System Using Fuzzy Logic
International Conference on Mechanical and Electrical Technology, 3rd, (ICMET-China 2011), Volumes 1–3
Research Protocol for Approval of Drift-Reducing Adjuvants for Dicamba in Brazil
Pesticide Formulation and Delivery Systems: 42nd Volume, Building the Future of Agrochemicals for 2030 and Beyond
Numerical Simulation of Turbulent Dispersion and Atomization within Sprays
Proceedings of the 2010 International Conference on Mechanical, Industrial, and Manufacturing Technologies (MIMT 2010)