Emission of pesticides to the air during sprayer application. A bibliographic review

Amodel for predicting evaporation and temperature changes in water drops traveling through air was developed and evaluated with laboratory data. The model uses combined sensible heat transfer and diffusion theory in an energy balance to simultaneously calculate evaporation as droplet temperature approaches wet bulb temperature of the air. Predicted droplet temperatures agreed closely with measured temperatures. The evaporation portion of the model was evaluated by measuring loss of water over longer time periods after the droplet reached wet bulb temperature. A volumetric method using microliter syringes was used to measure evaporation loss from 0.5 to 2 mm diameter drops. Model predictions generally agreed with measured rates.

/pdf/a-water-droplet-evaporation-and-temperature-model-1v829v5fpr.pdf

A Water Droplet Evaporation and Temperature Model

Studies were conducted to determine the effects of droplet size, leaf morphology, and a spray thickener on
pesticide spray deposition using chlorpyrifos as the indicator compound. The predicted deposition efficiencies for 140 µm
droplets were 99, 77, 65, and 55%, respectively, for cocklebur, entireleaf morninglory, velvetleaf, and coffee senna leaves.
Predicted deposition efficiencies decreased as droplet size increased for all four leaf types. The slopes of the linear
regression equations indicated that deposition efficiency would decrease by 16, 10, 8, and 6% , respectively, with each
100 µm increase in droplet diameter. Addition of a viscosity modifying adjuvant did not improve the deposition efficiency
on coffee senna leaves.

Droplet size and leaf morphology effects on pesticide spray deposition

Kinetics and evaporation of water drops in air

Spray mass balance in pesticide application: A review

Mathematical modeling of spray droplet deceleration and evaporation

Automatic Sprayer Control System

Mechanism of Trifluralin Diffusion in Silt Loam Soil

In the range of 4.4 to 49 C, there is an exponential relationship between temperature and trifluralin (α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) diffusion coefficients. Diffusion is low in air-dry soil for all temperatures. It increases to a maximum value when the soil has between 8 and 15% w/w soil moisture content and then decreases steadily as moisture content increases. When the air-filled fraction of soil void space is reduced below approximately 40% v/v by either compression or addition of moisture, diffusion begins to decrease. An equation was developed to predict trifluralin diffusion coefficients from a factorial experiment with seven soil moisture contents, five soil temperatures, and two bulk densities. Diffusion coefficients range from 3.8 X 10-11 cm2/sec to 2.8 X 10-6 cm2/sec. Fifteen terms are required in the prediction model to describe accurately the response surface of trifluralin diffusion coefficients. With the equation it is possible to predict trifluralin diffusion coefficients for any combination of measured soil parameters as long as they are represented by the range of the variables used in the experiment.

Prediction of Trifluralin Diffusion Coefficients

The Effects of Flow Rate on the Distribution Pattern and Drop-Size Spectrum of a Spinning Atomizer

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