Stagnation Point Displacement: Control of Losses on a Conically Shaped Aerosol Distributor

Autor:	Daniel E. LaCroix, Andrew R. McFarland, Shishan Hu
Rok vydání:	2009
Předmět:	Jet (fluid) Materials science Airflow Reynolds number Aerodynamics Mechanics Stagnation point Pollution Aerosol Physics::Fluid Dynamics symbols.namesake Classical mechanics Flow velocity symbols Environmental Chemistry General Materials Science Stokes number
Zdroj:	Aerosol Science and Technology. 43:311-321
ISSN:	1521-7388 0278-6826
Popis:	A cone was placed just upstream of the second stage of a Two-Stage Circumferential Slot Virtual Impactor in an attempt to uniformly distribute 10 μm aerodynamic diameter (AD) aerosol particles so a circumferential inlet of the second stage, which was located below the cone, could uniformly aspirate aerosol. Large losses were observed near the apex of the cone; however, the losses can be significantly reduced by injecting a small counter-flow jet of sheath flow through the apex of the cone. The jet displaces the stagnation point of the main flow and thereby alters the particle trajectories. Computational Fluid Dynamics (CFD) was the primarily tool used to investigate the concept through simulating the effects of different operational conditions such as the ratio of counterflow jet velocity to main flow velocity and the Stokes number. The velocity of the counterflow jet should be approximately 1–2 times the main airflow velocity to achieve low particle losses. The jet becomes asymmetric when the ratio of it...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::29103fc824505b25364ac1a1e1aac385 https://doi.org/10.1080/02786820802641453 Zobrazit plný text záznamu