NDLI: Bipolar Spray Charging for Leaf-Tip Corona Reduction by Space-Charge Control

Content Provider	IEEE Xplore Digital Library
Author	Cooper, Steven C. Law, S. Edward
Copyright Year	1972
Abstract	Previous studies in the development of electrostatic crop-spraying technology have confirmed a process limitation due to gaseous discharges induced to flow from earthed plants under action of intensely charged pesticide spray clouds. This paper reports the development and evaluation of a bipolar spray-charging strategy introduced in an effort to further increase the electrodeposition efficiency of charged airborne spray droplets by minimizing corona discharge at prominent leaf tips of such target plants. It was hypothesized that a properly constituted bipolar spray cloud would eliminate this detrimental corona neutralization of the approaching spray by reducing to below threshold the space-charge electric field imposed at the periphery of the target-plant canopy, while still maintaining an adequate local space-charge field within the electrically shielded plant canopy to enhance droplet deposition. Veriable-frequency bipolar square-wave functions ranging from 12 to 36 Hz were input to an induction-charging nozzle to produce spray clouds having the desired space-charge characteristics. Results of experimental charge-and mass-transfer analyses document that the bipolar strategy successfully eliminated induced target-corona but failed to provide any electrodeposition benefit within shielded target zones. As compared with uncharged sprays, however, unipolar-charging enhanced the droplet deposition within similar targets by factors of 1.3- and 1.5-fold for corona and noncorona target conditions, respectively.
Sponsorship	IEEE Industry Applications Society
Starting Page	217
Ending Page	223
Page Count	7
File Size	2410370
File Format	PDF
ISSN	00939994
Volume Number	IA-23
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1987-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spraying Corona Clouds Electrostatics Crops Fault location Agriculture Cotton Industry Applications Society Agricultural engineering
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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