THE DYE-STAIN TECHNIQUE FOR MEASURING THE SIZE OF RAINDROPS.
ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)
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A description is given of calibration experiments of the dye-stain technique for measuring the size of water drops. Relationships between stain diameter, d mm, and drop diameter, D mm, of d 1.38D to the 1.38 power for drops at low velocities and d 4D to the 1.36 power for drops at their terminal velocities were obtained over a drop range 0.5 to 4.5 mm. Author