Accession Number : AD0632415

Title :   INVESTIGATION OF THE COALESCENCE OF WATER DROPS.

Descriptive Note : Final rept. no. 2, 15 Feb 65-14 Feb 66,

Corporate Author : AEROJET-GENERAL CORP DOWNEY CALIF

Personal Author(s) : Woffinden,G. J.

Report Date : APR 1966

Pagination or Media Count : 35

Abstract : Experimental techniques have been developed for producing uniform water drops from 25 to 500 microns in diameter. The droplets are formed from a pressure -modulated water jet as it passes through a tiny orifice. Orifices with diameters as small as 20 microns have been used. The water pressure is modulated with a piezoelectric ceramic transducer oscillated at approximately 160,000 cps for the smallest droplets. The harmonic vibration of the transducer provides a stream of reproducible droplets at controllable intervals. The drop generator was designed for use in studying the coalescence of cloud and fog-sized water droplets under various environmental conditions, and high-speed photographic techniques were developed to measure coalescence delay times. (Author)

Descriptors :   (*WATER IMPINGEMENT, NUCLEATION), (*AEROSOL GENERATORS, LIQUID JETS), (*NUCLEATION, WATER), CLOUDS, FOG, WATER VAPOR, DROPS, COAGULATION, ELECTROSTATICS, HIGH SPEED PHOTOGRAPHY, FLUID MECHANICS

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE