Mathematical Modeling of Spray Droplet Deceleration and Evaporation

Goering, Carroll E.; Bode, L. E.; Gebhardt, M. R.

doi:10.13031/2013.37871

Cited by 44 publications

(14 citation statements)

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“…Field measurements of spray drift are also expensive and timeconsuming to conduct accurately (Miller, 1993). To compensate for such disadvantages, computer and mathematical models are developed and used by some researchers (Gil and Sinfort, 2005;Goering et al, 1972;Holterman et al, 1997;Smith et al, 2000;Thompson and Ley, 1983;Uçar, 2000). Such models have been developed to predict spray droplet trajectories both close to nozzles on a boom sprayer and in the drifting spray plume further downwind of the application site (Murphy et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Comparison of field and model percentage drift using different types of hydraulic nozzles in pesticide applications

Yarpuz-Bozdogan

Bozdoğan

2009

Int. J. Environ. Sci. Technol.

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ABSTRACT:In pesticide applications, small droplets are desired for better coverage and uniform distribution. Yet, small droplets have a problem: Drift, the movement of droplets off-target. Low drift nozzle produces fewer drift-prone droplets, < 100 µm, compared to standard hydraulic nozzles. In pesticide applications, standard hydraulic nozzles, hollow cone and flat fan nozzles are generally used by farmers. These nozzles have broad droplet spectrum and high proportion drift-prone droplets. Sample of drifted droplets and measurements in field conditions are expensive and can be time-consuming. However, models can be applied to predict drift without field measurement. In this study, model and field measurement of percentage pesticide drift were compared using different hydraulic nozzles, D4-45, F 11006 and low drift 11003 by gas chromatography equipped with a nitrogen-phosphorus detector. In the result of this study, for all nozzles, values up to 2 m and 3 m showed that there were statistically different according to German model and Dutch model, respectively. In the result of this study, percentage drift at 5 m compared to 1 m distance decreased approximately 15 folds in low drift 11003, 12 in F 11006 and 10 folds in hollow cone D4-45 nozzles in actual application and 5 folds in German and 9 folds in Dutch models.

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Section: Introductionmentioning

confidence: 99%

Comparison of field and model percentage drift using different types of hydraulic nozzles in pesticide applications

Yarpuz-Bozdogan

Bozdoğan

2009

Int. J. Environ. Sci. Technol.

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“…The rate of evaporation in terms of droplet diameter (in μm) used here was proposed by Goering et al (1972), Ranz and Marshall (1952), Sidahmed et al (2005) and Thompson and Ley (1983) 3:…”

Section: Conservation Of Droplet Massmentioning

confidence: 99%

Mathematical and physical modelling of rainfall in centrifuge

Caicedo

Tristancho

Thorel³

2015

International Journal of Physical Modelling in Geotechnics

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Rainfall simulation in centrifuge models is important for modelling soil-atmosphere interactions. However, the presence of Coriolis force, drag forces, evaporation and wind within the centrifuge may affect the distribution of rainfall over the model. As a result, development of appropriate centrifuge rain simulators requires a demanding process of experimental trial and error. This paper highlights the key factors involved in controlling rainfall in centrifuge simulations, develops a mathematical model to simulate rainfall within a centrifuge and shows how to calibrate it experimentally. Finally, the paper summarises some important factors that should be considered in the development of rainfall simulators for centrifuges.

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“…Various models describing the change in droplet diameter have been developed by Ranz et al (1952), Goering et al (1972) and by Williamson et al (1974). Williamson (ibid.)…”

Section: Drop Diametermentioning

confidence: 99%

The use of fine water sprays to suppress fume emissions when casting ferromanganese

et al. 2015

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During the casting of ferromanganese alloys from electric arc furnaces into sand beds at temperatures of up to 1800°C a considerable amount of very brown fumes are generated when the alloy fume is oxidized in the atmosphere. The fume is difficult to capture because of the large flux of gas that is generated. Possible reasons for this flux include the high evaporation rate of Mn at elevated temperatures, the large surface area of the casting beds and the large thermal plumes over the furnace tapholes and casting beds. It has been found that the use of fine water sprays along the edge of the roof that covers the casting bed resulted in a significant reduction in visible emissions. This paper describes research into the kinetics of the fume to improve the design of the capture hoods, as well as the mechanism of suppression by the water sprays by using CFD analysis. It is shown that the oxidation reaction produces less than 20% of the energy content of the plume over the arc furnace taphole, and also that radiation heat transfer may play an important role in increasing the energy content of the taphole plume. The capture of fume particles by fine spray droplets is shown to have limited efficiency, while the heat sink that is caused by evaporation does not materially contribute to the circulation of fume through the spray. It is postulated that the increased moisture content of the air over the casting beds may be instrumental in reducing the oxygen partial pressure or in the formation of an oxide layer, both of which would reduce metal evaporation and, therefore fume formation. The exact mechanism requires further investigation.

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Mathematical Modeling of Spray Droplet Deceleration and Evaporation

Cited by 44 publications

References 0 publications

Comparison of field and model percentage drift using different types of hydraulic nozzles in pesticide applications

Comparison of field and model percentage drift using different types of hydraulic nozzles in pesticide applications

Mathematical and physical modelling of rainfall in centrifuge

The use of fine water sprays to suppress fume emissions when casting ferromanganese

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