- Author
- Jaluria, Y. | Goldman, D.
- Title
- Transport Due to Flows With Opposing Buoyancy Arising In Room Fires.
- Coporate
- Rutgers Univ., New Brunswick, NJ
- Sponsor
- National Bureau of Standards, Gaithersburg, MD
- Contract
- NB83NADA4047
- Book or Conf
- Combustion Institute/Eastern States Section. Chemical and Physical Processes in Combustion. Fall Technical Meeting, 1985. November 4-6, 1985, Philadelphia, PA, 39/1-39/4 p., 1985
- Keywords
- room fires
- Abstract
- At various stages in the growth of an enclosure fire, negatively buoyant flows, which are characterized by the buoyancy force acting in a direction opposite to that of the flow, frequently arise. Two such circumstnces in which negatively buoyant flows are encountered are shown in Fig. 1. In the first case, the ceiling jet induced by the fire plume turns downward at the corners. This results in an upward buoyancy force which opposes the flow [1]. The downward flow is retarded by the opposing buoyancy effect and the flow penetrates to a finite distance o(p) before being buoyed back toward the ceiling. Similarly, in the second case, wall flows arise adjacent to the relatively cool upper wall and are injected into the lower layer where they become negatively buoyant. the flow again penetrates to a finite depth o(p) and then rises toward the interface between the two layers [2,3]. Though the two cases shown in Fig. 1 are of particular interest in this study, other circumstances in enclosure fires also give rise to such negatively buoyant flows.