- Author
-
Cooper, L. Y.
- Title
- Buoyant Source in the Lower of Two, Homogeneous, Stably Stratified Layers--A Problem of Fire in an Enclosure.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Report
-
NBSIR 83-2789; 83-WA/FE-4,
December 1983,
21 p.
- Distribution
- Available from National Technical Information Service
- Book or Conf
- American Society of Mechanical Engineers. Modeling of Environmental Flow Systems to be held at the ASME Annual Meeting Symposium. November 13-18, 1983,
Boston, MA,
1983
- Keywords
-
buoyant plumes
|
ceilings
|
compartment fires
|
fire models
|
fire plumes
|
heat transfer
|
mathematical models
|
smoke
- Abstract
- A point source of buoyancy is located at a specified elevation within the lower of two homogeneous, stably stratified layers. A turbulent buoyant plume is formed above the source, and it impinges on the layers' interface. Depending on the strenght of the source, its position below the interface and on the density difference of the two layers, it is conjectured that either: (1) a central porition of the impinging plume flow will penetrate and continue upward into the far field of the upper layer as a buoyant plume, the outer portion of the flow penetrating but then dropping down toward the interface because of negative relative buoyancy; or (2) none of the impinging plume flow will penetrate the upper layer (indepth) because of its being uniformly of negative buoyancy. Associated with these possible conditions will be an effective horizontal outflow of fluid at the interface. The paper derives and solves a set of model equations for these plume-interface interactions, and the results are applied to a generic heat transfer problem related to fires in enclosures.