SYMPOSIA PAPER Published: 01 January 2003
STP11207S

Characterizing Granular Material in Aerial Application

Source

The ASTM Standard: Standard Test Method for Particle Size Distribution of Granular Carriers and Granular Pesticides (E726-01) is the only ASTM standard that specifically addresses the characterization of nonspherical particles. To our knowledge there is no standard for particle size distribution measurements by laser diffraction or for particle sphericity measurements by any means to complete the description of the granular material. The present paper reviews a modeling effort that effectively characterizes and then represents the behavior of nonspherical particles during aerial application, highlights the difficulties inherent in interpreting light scattering by nonspherical particles, and suggests a laboratory experiment that accurately recovers particle sphericity. Model revisions enable the user to select the granular application technique from a menu of options once the granular material has been adequately parameterized. Quantitative comparisons are made with available field data to demonstrate the implementation of the several available granular material delivery systems. Notice is made that a standard should be developed for measuring (1) particle size distributions using laser diffraction instruments, and (2) particle sphericity with a technique suggested in the paper.

Author Information

Teske, ME
Continuum Dynamics, Inc., Ewing, NJ, USA
Hewitt, AJ
Stewart Agricultural Research Services, Inc., Macon, MO, USA
Ice, GG
NCASI West Coast Regional Center, Corvallis, OR, USA
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Details
Developed by Committee: E35
Pages: 198–212
DOI: 10.1520/STP11207S
ISBN-EB: 978-0-8031-5487-2
ISBN-13: 978-0-8031-3468-3