Journal
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
Volume 26, Issue 4, Pages 199-209Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppsc.200800043
Keywords
particle transient measurement; particle transport; simulation; two-phase flow
Funding
- United Stated Marine Corps Systems Command through M2 Technologies Inc
- Institute for Environmental Research at Kansas State University
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We inject a large number of newly created nano-particle aggregates into a chamber for the purpose of removing harmful contents In an indoor environment. This study is to experimentally and numerically investigate transient response of particle distributions to particle injections. A room-sized chamber of 4 m x 2.1 m x 2.4 m is connected to a specially designed particle-injection system, with two Optical Particle Counters used to simultaneously measure particle-number densities with the size range from 0.3 mu m to 10 mu m at the inlet and in the chamber. A velocity probe measures the flow that is up to 1 m/s. An Euler-type particulate-phase-transport model is developed and validated by comparing with experimental data. The study shows that the transient behavior of particle distributions is determined by many factors. including particle size, particle settling speed, sampling location, and velocity distribution. Particle number densities decrease in time more quickly for large particles than for small particles, and locations farther downstream in the chamber correlate more weakly with the inlet injection.
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