An experimental study was made of the drop sizes obtained on injecting a liquid into large hot airstreams of sustained high velocity. The liquid, a molten synthetic wax, was injected contrastream or costream through simple cylindrical tubes. Downstream, a traversing probe withdrew a representative sample of the stream, cooled it and froze the droplets. The collected solid particles were analyzed by sedimentation and by sieving. The results were correlated empirically by the dimension less equation m --m" (>+^) ( WPL(TL}J,A\ 1112 »L* 7Mass median diameter (X), air density (PA)? relative velocity (J 7 ), liquid viscosity (/JLL) and mass injection rate (W) were changed over 4-to 25-fold ranges. Surface tension (a L ), liquid density (pi) and air viscosity (/JLA) were not changed significantly.

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