2010 Annual Report
Computer simulation programs will be developed for the prediction of spray droplet deposition discharged from air-assisted sprayers under different microclimatic conditions. The programs will use the mathematical models and algorithms based on simulation results from a computational fluid dynamics program (FLUENT). Two-phase flow models with stochastic process under turbulent conditions will be developed and used in the computer simulation. Evaporation of droplet dispersal will be included in the models. A CAD program (Pro/ENGINEER) will be used to establish geometries of nozzles, sprayers and trees. The join-mapping technique will be used to incorporate the geometrics of sprayers and field targets into FLUENT for simulation. Variables in the models include wind velocity, turbulence intensity, canopy structure, ambient temperature, relative humidity, spray droplet size distribution, space ratios between droplets and air, sprayer structure and travel speed. The accuracy of the computer simulation models for air-assisted sprayers will be verified under controlled conditions in a wind tunnel and in orchard and nursery fields.
Document monitoring activities for the project: Regular email communications and phone calls were used to discuss research activities and project progress.