Accession Number : AD0276121

Title :   A SIMPLE METHOD OF DETERMINING THE FALL VELOCITY OF FALLOUT PARTICLES

Corporate Author : CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH

Personal Author(s) : BROIDO,A. ; CORCOS,G.M. ; MCMASTERS,A.

Report Date : 14 JUL 1961

Pagination or Media Count : 1

Abstract : A vertical wind tunnel was built for the purpose of fractionating irregularly shaped fallout particles according to their fall rates. If, before fractionation, the fallout material is mixed with a quantity of spherical glass beads of appropriate diameter (100 to 300 microns), the effective size of the irregularly shaped particles can be determined by measuring the diameter of the glass beads which are ejected in the same fraction. The fall velocity of the particles can be computed directly by computing the fall velocity of the glass beads. A complicated ejection rate curve was observed for each size of glass bead. Relatively clean separations and accurate fall velocity determinations are possible, even with the present apparatus, by fractionating spherical particles of two different densities and comparing the fall velocities as determined with each material. (Author)

Descriptors :   *PARTICLES, *FALLOUT, FALLING BODIES, MEASUREMENT, SEPARATION, WIND TUNNELS

Distribution Statement : APPROVED FOR PUBLIC RELEASE