Particle Sampling Efficiencies for an Aspirating Blunt Thick-Walled Tube in Calm Air.
NTIS: PB/241-169 :74 pages
The objective of this work was to determine the efficiency of dust sampling inlets by calculations of particle trajectories in experimentally determined flow-fields. This objective was achieved by computer calculations of trajectories in flow-fields to locate the critical trajectories that separate the entering particles' paths from those paths where the particles hit the tube wall or escape. Sampling efficiencies were then presented in terms of three variables--a dimensionless particle size coefficient, a dimensionless orifice size coefficient, and the tube orientation-- for the no-wind case. A procedure for achieving maximum efficiency in the design of a sampler was proposed.
CP; Final Contract Report;
NTIS Accession No.