- Author
- Cooper, L. Y. | Woodhouse, A.
- Title
- Buoyant Plume-Driven Adiabatic Ceiling Temperature Revisited.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Journal
- Journal of Heat Transfer, Vol. 108, No. 4, 822-826, November 1986
- Report
- NBSIR 85-3134, April 1985, 31 p.
- Distribution
- AVAILABLE FROM National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161. Telephone: 1-800-553-6847 or 703-605-6000; Fax: 703-605-6900; Rush Service (Telephone Orders Only) 800-553-6847; Website: http://www.ntis.gov
- Book or Conf
- National Heat Transfer Conference, 23rd. August 4-7, 1985. Preprinted in ASME Heat Transfer Division (HTD) Vol. 45, Heat Transfer in Fire and Combustion Systems, Denver, CO, ['1985', '1986']
- Keywords
- ceilings | compartment fires | convective heat transfer | fire plumes | fire models | heat transfer | room fires | walls
- Abstract
- In previous works, convective heat transfer from buoyant plume-driven ceiling jets to unconfined ceilings has been estimated using a formula for the temperature distribution below an adiabtic ceiling, Tad, obtained from experimental data in the range 0 < r/H < 0.7 (r is the radial distance from the plume H is the plume source-to-ceiling distance). The present study re-evaluates this data, and develops an independent estimate for Tad. The analysis takes account of the effect of ceiling surface re-radiation, and use is made of the previously established similarity between plume/ceiling- and jet/wall-driven heat transfer phenomena. The latter similarity is the basis of a correlation of recently reported free jet-wall jet "recovery temperature" data into a normalized Tad distribution. All of the analysis leads to new formulae for estimating the convective heat transfer to ceilings during enclosure fires. These new results confirm previous formulae, and extend them into the larger range 0 < r/H < 2.2.