- Author
-
Emmons, H. W.
- Title
- Progress With the Ceiling Jet.
- Coporate
- Harvard Univ., Cambridge, MA
- Report
-
Home Fire Proj. Tech Rpt. 87,
October 2, 1993,
18 p.
- Keywords
-
ceiling jets
|
stabilization
|
heat transfer
- Identifiers
- vertical inertia effect
- Abstract
- Development of a simple theory of ceiling jet flow is reported. After a very brief review of the present successful theory without heat transfer, several new attempts to include the heat transfer are presented. These include a full transient theory and the inclusion of the effect of accelerations normal to the ceiling on the ceiling pressure distribution. The transient after some time blows up as expected because no steady state with correct boundary conditions exist. The introduction of the effect of vertical acceleratons solves the ceiling jet with heat transfer but yields unexpected oscillatory solutions. While available experimental results have not reported such standing waves, no tests have been directed to finding such detail. New scientifically oriented ceiling jet experiments or an extensive study by the 3D ceiling jet theory of an initially hot (500K) gas flowing along a long water cooled ceiling open at its end are needed for validation of the present theory.