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Chapter 63: Air movements and particle dispersion in unidirectional airflow with application to operating rooms
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Services Engineering (name changed to Building Service and Energy Systems 2012-03-01).
2006 (English)In: 37th R3-Nordic Contamination Control Symposium / [ed] Wirtanen, G; Salo, S, 2006, Vol. 240, 449-449 p.Conference paper (Refereed)
Abstract [en]

In view of the discussions during the past few years about the ability of air distribution systems with unidirectional air flow to remove airborne contaminants in operating rooms, the author has performed tests in a test chamber with a parallel flow field of adjustable velocity. With aid of both smoke visualization and computer simulation, at as well laminar as turbulent parallel flow, it has been shown that the air movements behind obstacles become disordered with wakes and vortex streets. In order to observe the particle dispersion in parallel flows the particle level is increased in the air close to a person, and at the same time, the particle concentration in the critical region is measured. With this challenge test (LR-Method), it has been shown that the velocity of the parallel air flow has a decisive significance to the protection efficiency. When a person performs arm movements in a calm manner, the protection efficiency seems to be significant when the velocity exceeds 0.35 m/s.

Place, publisher, year, edition, pages
2006. Vol. 240, 449-449 p.
, VTT SYMPOSIA, ISSN 0357-9387 ; 240
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-42125ISI: 000243383100061ScopusID: 2-s2.0-42149151222ISBN: 951-38-6303-4OAI: diva2:445997
37th R3-Nordic Contamination Control Symposium. Tampere, FINLAND. MAY 29-31, 2006

QC 20111005

Available from: 2011-10-05 Created: 2011-10-05 Last updated: 2014-11-05Bibliographically approved

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