Abstract

A video motion analysis system was used with two different monodisperse droplet generators to quantify droplet impaction and any consequent reflection. By using different magnification/droplet generator combinations, droplet impaction was detailed at various stages. Low (7×) magnification, together with a generator that produced a spray cloud, allowed determination of the height and numbers of droplets reflected from plant surfaces. Higher (15×) magnification and a single-drop generator enabled the trajectory, and changes in velocity, of a rebounding droplet to be followed. By using high (90×) magnification and the single-drop generator, detailed measurements of a droplet deforming on impact could be made. Examples of how these techniques could be used are given. © 1998 SCI

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