- Author
-
Heskestad, G.
- Title
- Sprinkler/Hot Layer Interaction.
- Coporate
- Factory Mutual Research Corp., Norwood, MA
- Sponsor
- National Institute of Standards and Technology, Gaithersburg, MD
American Architectural Manufacturers, Des Plaines, IL
- Report
-
NIST GCR 91-590
May 1991
55 p.
- Distribution
- Available from National Technical Information Service
- Contract
- NIST-GRANT-60NANB0D1006
- Keywords
-
sprinklers
|
fire models
|
heat transfer
|
water sprays
|
zone models
- Abstract
- A model has been developed for the cooling of a quiescent hot layer by a sprinkler spray in a two-layer zone model (with no direct interaction of the spray with a fire plume), based on existing models of spray-induced flow and heat transfer to evaporating drops. In addition, existing models have been adapted to predict the penetration of the spray-induced flow below the layer interface and associated entrainment of lower-layer fluid into the upper layer. The cooling model is in good agreement with published results from sprinklered room-fire experiments, for which penetration of spray-induced flow into the lower layer and associated entrainment were calculated to be neligible. No published results have been found to test the validity of the adapted models of penetration and associated entrainment, which do not account for possible effects of the spray below the layer interface.