Deposition Efficiency from Aerial Application of Postemergence Herbicides

2008 ◽  
pp. 211-211-22
Author(s):  
IW Kirk ◽  
LE Bode ◽  
LF Bouse ◽  
RA Stermer ◽  
JB Carlton
Keyword(s):  
Deposition Efficiency ◽  
Aerial Application ◽  
Postemergence Herbicides

OPERATIONAL CONSIDERATIONS FOR OPTIMUM DEPOSITION EFFICIENCY IN AERIAL APPLICATION OF DISPERSANTS

1983 ◽  
Vol 1983 (1) ◽  
pp. 53-60 ◽  
Author(s):  
Gordon P. Lindblom ◽  
Bryan S. Cashion
Keyword(s):  
Droplet Size ◽  
Oil Spills ◽  
Droplet Size Distribution ◽  
Deposition Efficiency ◽  
Field Trials ◽  
Aviation Industry ◽  
Agricultural Practice ◽  
Aerial Application ◽  
Model Studies ◽  
Spray System

ABSTRACT The growing worldwide recognition of the value of aircraft for application of dispersants to marine oil spills has resulted in a number of tests and field trials, but they have developed new concerns regarding control of depositional efficiency. These are similar to those extensively studied by the agricultural aviation industry, and involve anything influencing placement of a calculated dosage on a given area with minimum variation or loss due to aircraft turbulence, drift, or other factors. Aerial application of dispersants differs from agricultural practice in the physical properties of the fluids sprayed, the dosage generally required, and operational factors such as altitude, speed, swath, and total area to be covered. Consideration of these may result in need for special mechanical designs or alterations in the spray system. The major requirement for depositional efficiency is the droplet size distribution, which is affected by at least five factors. The most critical are nozzle diameter, viscosity of the fluid sprayed, and its exit velocity relative to the aircraft speed. These, together with pressure and pump rates, result in two shear regimes which are the ultimate controllers of droplet size. This report presents evidence for the above from mathematical model studies, laboratory windstream tests, and flight tests of both piston and turbo-powered aircraft. The data are used to propose a framework of requirements for optimal aerial dispersant application operations.

COMPARISON OF DROP SIZE DATA FROM GROUND AND AERIAL APPLICATION NOZZLES AT THREE TESTING LABORATORIES

2014 ◽  
Vol 24 (2) ◽  
pp. 181-192 ◽  
Author(s):  
Bradley K. Fritz ◽  
W. Clint Hoffmann ◽  
Greg R. Kruger ◽  
Ryan S. Henry ◽  
Andrew Hewitt ◽  
...  
Keyword(s):  
Drop Size ◽  
Aerial Application ◽  
Testing Laboratories ◽  
Size Data

scholarly journals Numerical Simulation of the Aerosol Particle Motion in Granular Filters with Solid and Porous Granules

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 268
Author(s):  
Olga V. Soloveva ◽  
Sergei A. Solovev ◽  
Ruzil R. Yafizov
Keyword(s):  
Numerical Simulation ◽  
Aerosol Particle ◽  
Particle Deposition ◽  
Particle Diameter ◽  
Deposition Efficiency ◽  
Hydrodynamic Resistance ◽  
Hydrodynamic Properties ◽  
Granular Filters ◽  
Limiting Value ◽  
Good Agreement

In this work, a study was carried out to compare the filtering and hydrodynamic properties of granular filters with solid spherical granules and spherical granules with modifications in the form of micropores. We used the discrete element method (DEM) to construct the geometry of the filters. Models of granular filters with spherical granules with diameters of 3, 4, and 5 mm, and with porosity values of 0.439, 0.466, and 0.477, respectively, were created. The results of the numerical simulation are in good agreement with the experimental data of other authors. We created models of granular filters containing micropores with different porosity values (0.158–0.366) in order to study the micropores’ effect on the aerosol motion. The study showed that micropores contribute to a decrease in hydrodynamic resistance and an increase in particle deposition efficiency. There is also a maximum limiting value of the granule microporosity for a given aerosol particle diameter when a further increase in microporosity leads to a decrease in the deposition efficiency.

Decrease of 4,5,6,7-Tetrachlorophthalide in Paddy Field Soil After Aerial Application

2008 ◽  
Vol 81 (4) ◽  
pp. 383-386 ◽  
Author(s):  
M. Iwashita ◽  
T. Maeda ◽  
T. Hori ◽  
T. Asada ◽  
K. Oikawa ◽  
...  
Keyword(s):  
Paddy Field ◽  
Field Soil ◽  
Aerial Application ◽  
Paddy Field Soil

Effect of herbicides on St John's wort (Hypericum perforatum L.)

1991 ◽  
Vol 31 (4) ◽  
pp. 499 ◽  
Author(s):  
MH Campbell ◽  
BR Milne ◽  
JJ Dellow ◽  
HI Nicol
Keyword(s):  
Hypericum Perforatum ◽  
New South ◽  
Arable Land ◽  
Ground Cover ◽  
Aerial Application ◽  
St John’S Wort ◽  
Strong Trend ◽  
St John's Wort ◽  
South Wales ◽  
Hypericum Perforatum L

The effect of type of herbicide and time and rate of application on the reduction in ground cover of St John's wort (Hypericum perforatum L.) was determined at Orange, New South Wales. In January, April, July and November 1988, 8 herbicide treatments including the currently used glyphosate and picloram + 2,4-D were applied to vigorously growing H. perforaturn, and the reduction in percentage ground cover was recorded in December 1989. Ineffective herbicides (a.i./ha) were tebuthiuron, 0.8-6.4 kg; metsulfuron, 5-20 g; and paraquat + diquat, 0.4 + 0.5 kg. The addition of metsulfuron (2.5 g a.i./ha) to glyphosate (0.9 and 1.8 kg a.i./ha) did not increase the effectiveness of the latter. Effective herbicides (kg a.i./ha) were triclopyr + picloram, 0.6 + 0.2; picloram + 2,4-D, 0.2 + 0.8; glyphosate, 1.8; and triclopyr, 1.92. There was a strong trend for these herbicides to be more effective in January and November than in April and July. Based on price, effectiveness and selectivity, triclopyr + picloram would be preferred to the other herbicides for boom and spot spraying, and glyphosate would be the only herbicide suitable for aerial application prior to sowing improved pastures on non-arable land.

Evaluation of FSCBG — An Aerial Application Simulation Model

1995 ◽  
Vol 11 (4) ◽  
pp. 485-494 ◽  
Author(s):  
B. Richardson ◽  
J. W. Ray ◽  
K. J. Miller ◽  
A. L. Vanner ◽  
N. A. Davenhill
Keyword(s):  
Simulation Model ◽  
Aerial Application

The influence of feedstock powders on the CGS deposition efficiency of bond coats for TBCs

2015 ◽  
Vol 622 ◽  
pp. 394-401 ◽  
Author(s):  
V. Crespo ◽  
I.G. Cano ◽  
S. Dosta ◽  
J.M. Guilemany
Keyword(s):  
Deposition Efficiency ◽  
Bond Coats
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