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What is Volume Median Diameter

Handbook of Research on Uncovering New Methods for Ecosystem Management through Bioremediation
It also refers to average volumetric size or mean size. The Volume Median Diameter (VMD) refers to the midpoint droplet size, where half of the volume of spray is in droplets smaller, and half of the volume is in droplets larger than the mean. For example, A VMD ( DV 0.5 ) of 50µm, indicates that half of the volume is in droplet sizes smaller than 50µm, and half the volume is in droplet sizes larger than 50µm.
Published in Chapter:
Fundamentals of Electrostatic Spraying: Basic Concepts and Engineering Practices
Manoj Kumar Patel (Academy of Scientific and Innovative Research, India & CSIR-Central Scientific Instruments Organisation, India) and Chirravoori Ghanshyam (CSIR-Central Scientific Instruments Organisation, India)
DOI: 10.4018/978-1-4666-8682-3.ch018
The desired attributes of electrostatic spraying are uniform deposition onto both directly exposed or obscured crop surfaces which minimize the off-target losses of active ingredients to soil, water, atmosphere and provide more effective and economical pest control. This chapter presents an overview of electrostatic spraying technologies in the field of agriculture emphasizing the key role of advanced electrostatic instrumentation and chronicles the scientific innovations in the parlance of providing cost effective and reliable commercial systems along with an insight on the needs of future research perspectives and directives. It is aimed primarily at a familiarization with spraying concepts and engineering practices. This text is to bridge the knowledge and experience gap among researchers and technology developers and the people involved in electrostatic processes applied to agriculture and food processing. It will also introduce the engineering aspects of design and development of an electrostatic spraying nozzle for agricultural applications.
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