Accession Number : AD0825986

Title :   TURBULENT DIFFUSION OF SMALL PARTICLES.

Descriptive Note : Quarterly progress rept. no. 1, Sep-Dec 67,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF AEROSPACE ENGINEERING

Personal Author(s) : Snyder, William H.

Report Date : 08 DEC 1967

Pagination or Media Count : 9

Abstract : Racks to hold the cameras and power supplies and boxes to house the flash tubes have been constructed. The test section of the wind tunnel has been aligned and modified to accommodate the 90 illumination system. A particle injector utilizing a vertical diffuser to suspend a cloud of particles has been used to inject particles into the wind tunnel at a rate of one every 2 to 5 seconds. A particle detector utilizing a laser and photovoltaic cell has detected 50-micron glass beads exiting from a small tube. An amplifier was built to match the output of the photocell to the input of the timing system. Calculations were made that showed that for a 5% error in the correlation, a 48% standard deviation of particle diameters is acceptable. (Author)

Descriptors :   *TURBULENCE), (*PARTICLES, GAS FLOW, DIFFUSION, WIND TUNNEL MODELS, DETECTORS, LASERS, PHOTOELECTRIC CELLS(SEMICONDUCTOR), DRAG, PARTICLE SIZE, SCATTERING, MATHEMATICAL ANALYSIS, ERRORS, COMPUTER PROGRAMS.

Subject Categories : Physical Chemistry
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE