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ASTM Selected Technical Papers
Pesticide Formulation and Delivery Systems: 40th Volume, Formulation, Application and Adjuvant Innovation
By
Curtis M. Elsik
Curtis M. Elsik
Symposium Chairperson and STP Editor
1
Indorama Ventures Oxides LLC
,
The Woodlands, TX,
US
Search for other works by this author on:
ISBN:
978-0-8031-7700-0
No. of Pages:
183
Publisher:
ASTM International
Publication date:
2020

In agricultural sprays, droplet size influences both the efficacy and drift potential for pesticide applications. The droplet size spectra of these sprays are commonly evaluated via laser diffraction (LD) measurements within a spray-classification wind tunnel. A recurring issue when performing these measurements is the validation of instrument performance. For performing calibration verification on the instrument, a polydisperse standard with a known distribution is preferred over a monodisperse standard as a proxy for the spray distributions to better represent the spray and therefore challenge the instrument transfer function. However, this can introduce dispersion-related bias error if not all diameter droplets are moving at the same velocity. Herein a method is developed that allows for calculating diameter-resolved correction factors from first principles, enabling the correction of the bias error associated with the dispersion of polydisperse standards. The correction factor is found from the diameter-resolved residence time within the measurement volume, which is calculated by simulating the acceleration of the droplet from the point of generation. Herein this method is applied to LD calibration with gravity-dispersed National Institute of Standards and Technology traceable glass microbeads, allowing for the successful recovery of the known distribution. This method enables LD users to easily verify LD measurements without relying on the instrument manufacturer or in cases in which the instrument manufacturer is unwilling to perform verification, such as through glass windows rather than open air. Additionally, the present method is expanded to predict diameter-resolved bias in LD measurements performed in spray-classification wind tunnels consisting of spray in a coflowing carrier gas in which the spray is not in velocity equilibrium with the gas flow.

1.
Permin
O.
,
Jorgensen
L. N.
, and
Persson
K.
, “
Deposition Characteristics and Biological Effectiveness of Fungicides Applied to Winter Wheat and the Hazards of Drift When Using Different Types of Hydraulic Nozzles
,”
Crop Protection
11
, no.
6
(
1992
): 541–546.
2.
Wolf
T. M.
, “
Optimizing Herbicide Performance—Biological Consequences of Using Low Drift Nozzles
,”
Aspects of Applied Biology
66
(
2002
): 79–86.
3.
Hewitt
A. J.
,
Valcore
D. L.
, and
Barry
T.
, “
Analyses of Equipment, Meterology and Other Factors Affecting Drift from Applications of Sprays by Ground Rig Sprayers
,” in
Pesticide Formulations and Application Systems: Twentieth Volume
, ed.
Viets
A.
,
Tann
R.
, and
Mueninghoff
J.
(
West Conshohocken, PA
:
ASTM International
,
2001
), 44–56.
4.
Maybank
J.
,
Yoshida
K.
, and
Grover
R.
, “
Spray Drift from Agricultural Pesticide Applications
,”
Journal of the Air Pollution Control Association
28
, no.
10
(
1978
): 1009–1014.
5.
Hewitt
A. J.
, “
Droplet Size and Agricultural Spraying, Part I: Atomization, Spray Transport, Deposition, Drift, and Droplet Size Measurement Techniques
,”
Atomization and Sprays
7
, no.
3
, (
1997
): 235–244.
6.
Hewitt
A. J.
, “
Spray Drift: Impact of Requirements to Protect the Enviroment
,”
Crop Protection
19
(
2000
): 623–627.
7.
Dorr
G. J.
,
Hewitt
A. J.
,
Adkins
S. W.
,
Hanan
J.
,
Zhang
H.
, and
Noller
B.
, “
A Comparision of Initial Spray Characteristics Produced by Agricultural Nozzles
,”
Crop Protection
53
(
2013
): 109–117.
8.
Elsik
C.
, “
Round-Robin Evaluation of ASTM Standard Test Method E2798 for Spray Drift Reduction Adjuvants
,” in
Pesticide Formulations and Delivery Systems, 31st Volume: Innovative Green Chemistries for the 21st Century
, ed.
Devisetty
B. N.
(
West Conshohocken, PA
:
ASTM International
,
2011
), 103–124.
9.
ISO/FDIS 25258,
Crop Protection Equipment—Droplet-Size Spectra from Atomizers—Measurements and Classification
(
Geneva, Switzerland
:
ISO
,
2018
).
10.
Standard Guide for Determining Cross-Section Averaged Characteristics of a Spray Using Laser-Diffraction Instruments in a Wind Tunnel Apparatus
, ASTM E2872 (
West Conshohocken, PA
:
ASTM International
, approved April 1,
2014
),
11.
Bilanin
A. J.
,
Teske
M. E.
,
Barry
J. W.
, and
Ekblad
R. B.
, “
AGDISP: Aircraft Spray Dispersion Model, Code Development and Experimental Validation
,”
Transactions of the ASAE (1989)
32
, no.
1
(
1989
): 327–334.
12.
Teske
M. E.
,
Millter
P. C.
H.
,
Thistle
H. W.
, and
Birchfield
N. B.
, “
Initial Development and Validation of a Mechanistic Spray Drift Model for Ground Boom Sprayers
,”
Transactions of the ASABE
52
, no.
4
(
2009
): 1089–1097.
13.
ISO/FDIS 13322,
Particle Size Analysis—Image Analysis Methods—Part 1: Static Image Analysis Methods
(
Geneva, Switzerland
:
ISO
,
2014
).
14.
De Cock
N.
,
Massinon
M.
,
Nuyttens
D.
,
Dekeyser
D.
, and
Leabeau
F.
, “
Measurements of Reference ISO Nozzles by High-Speed Imaging
,”
Crop Protection
89
(
2016
): 105–115.
15.
Sarkar
S.
,
Karmin
S.
, and
Kruger
G. R.
, “
Spray Characterization by Optical Image Analysis
,” in
Pesticide Formulation and Delivery Systems: 36th Volume, Emerging Trends Building on a Solid Foundation
, ed.
Poffenberger
C.
and
Heuser
J.
(
West Conshohocken, PA
:
ASTM International
,
2016
), 162–182.
16.
Roisman
I. V.
and
Tropea
C.
, “
Flux Measurements in Sprays Using Phase Doppler Techniques
,”
Atomization and Sprays
11
, no.
6
(
2001
).
17.
Standard Test Method for Determining Liquid Spray Drop Size Characteristics in a Spray Using Optical Nonimaging Light-Scattering Instruments
, ASTM E1260 (
West Conshohocken, PA
:
ASTM International
, approved November 1,
2009
),
18.
ISO 13320,
Particle Size Analysis—Laser Diffration Methods
(
Geneva, Switzerland
:
ISO
,
2009
).
19.
de Boer
G. B.
J.
,
de Weerd
C.
,
Thones
D.
, and
Goossens
H. W.
J.
, “
Laser Diffraction Spectrometry: Fraunhofer Diffraction versus Mei Scattering
,”
Particle & Particle Systems Charaterization
4
, nos.
1–4
(
1987
): 14–19.
20.
Fritz
B. K.
,
Hoffmann
W. C.
,
Czaczyk
Z.
,
Bangley
W.
,
Kruger
G.
, and
Henry
R.
, “
Measurement and Classifation Methods Using the ASAE S572.1 Reference Nozzles
,”
Journal of Plant Protection Research
52
, no.
4
(
2012
): 447–457.
21.
Hoffmann
W. C.
,
Fritz
B. K.
, and
Martin
D. E.
, “
Air and Spray Mixture Temperature Effects on Atomization of Agricultural Sprays
,”
Agricultural Engineering International: CIGR Journal
13
, no.
1
(
2011
).
22.
Miller
P. C.
H.
and
Tuck
C. R.
, “
Factors Influencing the Performance of Spray Delivery Systems: A Review of Recent Developments
,”
Journal of ASTM International
2
, no.
6
(
2005
): JAI12900.
23.
Fritz
B. K.
,
Hoffmann
C. W.
,
Kruger
G. R.
,
Henery
R. S.
,
Hewitt
A.
, and
Czaczyk
A.
, “
Comparison of Drop Size Data from Ground and Aerial Application Nozzles at Three Testing Laboratories
,”
Atomization and Sprays
24
, no.
2
(
2014
): 181–192.
24.
Standard Test Method for Calibration Verification Using Laser Diffraction Particle Sizing Instruments Using Photomask Reticles
, ASTM E1458 (
West Conshohocken, PA
:
ASTM International
, approved October 1,
2016
),
25.
Hirleman
E. D.
, “
On-Line Calibration Technique for Laser Diffraction Droplet Sizing Instruments
,” in
ASME 1983 International Gas Turbine Conference and Exhibit
(
New York
:
American Society of Mechanical Engineers
,
1983
).
26.
Crowe
C. T.
,
Elger
D. F.
, and
Roberson
J. A.
,
Engineering Fluid Mechanics
(
Hoboken, NJ
:
Wiley
,
2005
).
27.
Clift
R.
and
Gauvin
W. H.
, “
Motion of Entrained Particles in Gas Streams
,”
The Canadian Journal of Chemical Engineering
49
, no.
4
(
1971
): 439–448.
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