Technique Development for Particle Bounce Monitoring of Unknown Aerosol Particles
Titel:
Technique Development for Particle Bounce Monitoring of Unknown Aerosol Particles
Auteur:
Xu, Mindi Willeke, Klaus
Verschenen in:
Aerosol science and technology
Paginering:
Jaargang 18 (1993) nr. 2 pagina's 129-142
Jaar:
1993
Inhoud:
A particle bounce monitor has been developed to determine the bounce properties of unknown aerosols. In this new device aerosol is sampled through a conical inlet into a nozzle of constant cross section. The aerosol flow leaves the inlet section as a free jet and is separated into a center flow, which is drawn into a constant-flow particle counter, and a side flow, which may be adjusted to different flow rates. The total sampling flow rate, and, therefore, the particle velocity can be controlled by adjusting the side flow. Particles away from the center that have acquired high enough inertia will impact onto the bounce surface; nonbouncy particles will be removed by the surface and bouncy particles will bounce into the center flow. Thus, the particle concentration in the center flow is dependent on the particle bounce properties. The device has been evaluated with different aerosols at different operating conditions. It was found that it is highly sensitive to the bounce characteristics of aerosols and is, thus, suitable for monitoring the bounce characteristics of unknown aerosols. A funnel-like bounce surface with a 60° inlet angle was found to perform better than 120° and 180° (flat) surfaces.
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