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Investigation of Fire Impingement on a Horizontal Ceiling.

pdf icon Investigation of Fire Impingement on a Horizontal Ceiling. (3330 K)
You, H. Z.; Faeth, G. M.

NBS GCR 80-251; 49 p. July 1980.


National Bureau of Standards, Gaithersburg, MD

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.
Order number: PB80-220437


flame impingement; heat transfer; convection; radiation; temperature; velocity; ceilings


This report covers the second year of a three-year study. The first year of the investigation was devoted to convective ceiling heat flux measurements. The present effort concentrated on radiative heat flux measurements and a portion of the flow. structure measurements. A new experimental apparatus was constructed which allows the long term testing needed for structure measurements. This arrangement has a water-cooled ceiling, 1 m in diameter. The fire source is simulated by a 55 mm ID burner fueled with natural gas operating at heat release rates up to 8.5 kW. Convective and radiative heat fluxes are measured with heat flux gages, mean gas temperatures were obtained with fine wire thermocouples, mean velocities and velocity fluctuations are measured with a laser Doppler anemometer, an impact probe is also used for mean velocities, and mean concentrations are measured by isokinetic gas sampling with gas chromatograph. Measurements completed to date include: flame shape, convective and radiative heat fluxes to the ceiling, radiative heat fluxes to the ambiance, mean temperatures, and mean velocities and velocity fluctuations in the plume portion of the flow.