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Behavior of an Air Curtain Subjected to Transversal Pressure Variations
- Source :
- Journal of Environmental Engineering. 132:263-270
- Publication Year :
- 2006
- Publisher :
- American Society of Civil Engineers (ASCE), 2006.
-
Abstract
- The mass transfer and the influence of sudden external perturbations on the behavior of an air curtain are evaluated by means of experimental and numerical studies. The air curtain, consisting of a plane air jet, is combined with a laminar flow unit. They constitute an “open” protection device intended to protect a localized area against any external airborne contamination. The external perturbations are characterized by fast pressure changes, such as drafts which can be experienced in a room. Numerical and experimental results both show that the air jet is strongly perturbed by the pressure gradient in the lateral direction. The jet is subjected to a brutal back and forth motion, breaks, and generates a swirl which is responsible for pollution entrainment inside the protected area. Gas concentration measurements suggested that there is an inlet jet velocity for which the pollution is minimal. These experimental results, corresponding to a strongly unsteady flow, were qualitatively well-predicted by the s...
- Subjects :
- Entrainment (hydrodynamics)
Pollution
Jet (fluid)
geography
Environmental Engineering
geography.geographical_feature_category
Materials science
Meteorology
Plane (geometry)
media_common.quotation_subject
Laminar flow
Mechanics
Inlet
Physics::Fluid Dynamics
Mass transfer
Environmental Chemistry
Pressure gradient
General Environmental Science
Civil and Structural Engineering
media_common
Subjects
Details
- ISSN :
- 19437870 and 07339372
- Volume :
- 132
- Database :
- OpenAIRE
- Journal :
- Journal of Environmental Engineering
- Accession number :
- edsair.doi...........bc01f08800a08ef343c98fa5db6c0ed2