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Transient Response of Particle Distribution in a Chamber to Transient Particle Injection
Author(s) -
Zhang Ning,
Zheng Zhongquan,
Eckels Steven,
Nadella Venkata B.,
Sun Xiaoyang
Publication year - 2010
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.200800043
Subject(s) - particle (ecology) , transient (computer programming) , mechanics , settling , range (aeronautics) , particle size , particle number , inlet , materials science , particle counter , physics , volume (thermodynamics) , chemistry , aerosol , thermodynamics , meteorology , composite material , mechanical engineering , oceanography , computer science , engineering , geology , operating system
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 × 2.1 m × 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 μm to 10 μm 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.