Gas separation – Deflector
Reexamination Certificate
2011-01-25
2011-01-25
Hopkins, Robert A (Department: 1797)
Gas separation
Deflector
C073S028060, C073S863220
Reexamination Certificate
active
07875095
ABSTRACT:
A skimmer device for concentrating an aerosol from a flowing gas stream, having an inlet with inlet aperture and inlet raceway, an outlet with virtual impact void and collector channel, and bulk flow divertors symmetrically disposed on either side of the long axis of flow, further characterized in that the downstream walls of the bulk flow divertors are concavedly curved and reverse the direction of bulk flow. In section, the four channels or passages of the “skimmer” thus form a “crossed tee” with concavedly contoured lateral arms curving back around. The lateral flow channels are for diverting the bulk flow into exhaust chimney spaces, and the chimney spaces are positioned proximate to the inlet element and anterior to the collection channel. In operation, the bulk flow streamlines are thereby folded more than 90 degrees away from the long axis of flow on the laterally disposed concave walls of the bulk flow channels. While counterintuitive, this was found using computational fluid dynamics (CFD) and experimentation to dramatically reduce wall separation and related instabilities and to improve particle recoveries. Large two-dimensional arrays of closely stacked inlet and skimmer elements are thus achieved by fitting the chimneys into spaces between parallel inlet elements. The interlinked problems of flow instability, manufacturability of arrays, and scale-up of chimney cross-sectional area to equalize pressure differentials in the bulk flow diverter exhaust ducts, particularly in two-dimensional arrays at high throughput, are uniquely solved with this geometry.
REFERENCES:
patent: 2932394 (1960-04-01), McGinn
patent: 3901798 (1975-08-01), Peterson
patent: 4301002 (1981-11-01), Loo
patent: 4383171 (1983-05-01), Sinha
patent: 4670135 (1987-06-01), Marple
patent: 4767524 (1988-08-01), Yeh
patent: 5183481 (1993-02-01), Felder
patent: 5270542 (1993-12-01), McMurry
patent: 5425802 (1995-06-01), Burton
patent: 5498271 (1996-03-01), Marple et al.
patent: 5533406 (1996-07-01), Geise
patent: 5565677 (1996-10-01), Wexler et al.
patent: 5788741 (1998-08-01), Burton
patent: 6062392 (2000-05-01), Birmingham
patent: 6120573 (2000-09-01), Call
patent: 6290065 (2001-09-01), Kenning
patent: 6386015 (2002-05-01), Rader
patent: 6402817 (2002-06-01), Bergman
patent: 6695146 (2004-02-01), Call
patent: 6698592 (2004-03-01), Kenning
patent: 7325465 (2008-02-01), Solomon
patent: 2004/0232052 (2004-11-01), Call
patent: 2007/0048186 (2007-03-01), Call
patent: 2008/0022853 (2008-01-01), Ariessohn
Peng et al. (1995) Generating particle beams of controlled dimensions and divergence: II. Experimental evaluation of particle motion in aerodynamic lenses and nozzle expansions. Aerosol Sci Technol 22:293-313.
Loo BW et al. Dichotomous virtual impactors for large scale monitoring of airborne particulate matter, In (BYH Liu, ed) Fine Particles: Aerosol generation, measurement, sampling and analysis (1976) pp. 312-349.
Chen, BT and HC Yeh (1985) A Novel Virtual Impactor: Calibration and Use, J Aerosol Sci 16: 343-354.
Novick VS and JL Alvarex (1987) Design of a multi-stage virtual impactor, Aerosol Sci Tech 6:63-70.
Loo BW and CP Cork (1988) Development of high efficiency virtual impactors, Aeros Sci Techn 9:167-176.
Marple VA et al (1980) Virtual Impactors: a theoretical study, Environ Sci Tech 14:976.
Goo, J (2002) Numerical simulation of aerosol concentration at atmospheric pressure by a cascade of aerodynamic slit lenses, J Aerosol Sci 33:1493-1507.
Ariessohn Peter C
Novosselov Igor V
Enertechnix, Inc
Hopkins Robert A
Lambert K Karel
Lambert Patent Services
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