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The
photograph illustrates water drop formation by a spray-plate type nozzle
where a high velocity turbulent jet of water impacts the center of a
circular plate and spreads concentrically outward. The resultant water
film flows radically outward on the plate, detaches from the plate as a
liquid fan sheet which breaks into concentric ligaments, and then breaks
into individual drops with an approximately log-normal diameter
distribution. The objective of the research was to obtain knowledge of the
mechanisms of drop formation and to measure drop size distributions (using
both photographs and a phase Doppler particle analyzer) as a function of
the relevant parameters, such as nozzle velocity and diameter, and plate
diameter for optimizing drop size distributions for center-pivot
irrigation applications.
The photograph was obtained with a 4x5 inch view camera by
back-illuminating the spray with a four microsecond duration electronic
flash.
Reference:
McCreery,
G.E., and Stoots, C.M., “Drop Formation Mechanisms and Size
Distributions for Spray Plate Nozzles,” Intl.
J. Multiphase Flow, 22 431-452 (1996)
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