Abstract
The mean drop size produced when a jet of liquid issuing from a nozzle into the atmosphere, breaks up, has been investigated and experiments have been carried out both with fixed nozzles and with moving nozzles (attached to an aircraft) discharging backwards. A relation expressing drop size in terms of viscosity and the relative velocity between the jet and the surrounding air, applicable to both cases, is given.
At low velocities this relation ceases to apply and drop size reaches a limiting value. Factors influencing this limiting figure are discussed and information has also been obtained on the stability of large drops.
Measurements made on the length of the jet confirm the work of Tyler and Richardson but also disclose a hitherto unsuspected anomaly in the case of very viscous liquids.
Similar results were obtained when a jet issued into another liquid with which it did not mix, but showed the effect of the relative viscosity of the liquids on the break-up.