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Search Publications by: Jiann C. Yang (Fed)

Displaying 251 - 275 of 316

An Analysis of the Wright Patterson Full-Scale Engine Nacelle Fire Suppression Experiments (NISTIR 6193)

November 1, 1997

Author(s)

Anthony P. Hamins, Thomas G. Cleary, Jiann C. Yang

An analysis is presented on the full-scale suppression experiments conducted during 1996 and 1997 in the F-22 engine nacelle fire simulator at Wright Patterson Air Force Base. Experiments investigated the relative effectiveness of halogenated agents and

Evaporation of a Small Water Droplet Containing an Additive

August 1, 1997

Author(s)

M D. King, Jiann C. Yang, W. S. Chien, William L. Grosshandler

An experimental study on the evaporation of a small water droplet containing an additive on a heated, polished stainless-steel surface was performed. Solutions of water containing 30% (w/w) and 60% (w/w) of potassium acetate and sodium iodide were used in

Experimental Observations of PMMA Spheres Burning at Reduced Gravity

May 19, 1997

Author(s)

Jiann C. Yang, Anthony P. Hamins, M Glover, M D. King

Polymer combustion is a very complicated process which involves the coupling of gas-phase combustion, melting, pyrolysis and possible charring of the condensed phase. Although only a few studies on the combustion of a spherically shaped polymer have been

Effect of Sample Size on the Heat Release Rate of Charring Materials

March 3, 1997

Author(s)

S J. Ritchie, Kenneth D. Steckler, Anthony P. Hamins, Thomas G. Cleary, Jiann C. Yang, Takashi Kashiwagi

The burning of a horizontal wood slab situated atop an insulating substrate was modeled using three coupled submodels for the gas-phase, wood, and substrate processes. A global analytical model was used to determine the radiative and convective heat

Measured and Predicted Thermodynamic Properties of Selected Halon Alternative/Nitrogen Mixtures

January 1, 1997

Author(s)

Jiann C. Yang, I Vazquez, C I. Boyer, Marcia L. Huber, L A. Weber

Experimental measurements of selected thermodynamic properties of alternative agent/nitrogen mixtures were performed. The selected alternatives were HFC-227 ea (C3HF7), CF3I, FC-218 (C3F8), and HFC-125 (C2HF5); CF3Br was also included as a reference. A

Simple Piezoelectric Droplet Generator

January 1, 1997

Author(s)

Jiann C. Yang, W. S. Chien, M D. King, William L. Grosshandler

A design for a piezoelectric on-demand droplet generator is presented. Its simple construction and ease of operation distinguish this generator from other previously reported. The droplet generator has been successfully used to produce droplets of aqueous

Aerosol and SPGG Technology Fire Suppression Screening Methods (NISTIR 5904)

October 28, 1996

Author(s)

William L. Grosshandler, Jiann C. Yang, Thomas G. Cleary

The search for alternatives to halons for fire suppression applications has identified not only new compounds which have physical properties similar to the bromochlorofluorocarbon family, but also inert gaseous agents that are released from a solid state

Combustion of Polymethylmethacrylate Spheres at Normal and Reduced Gravity (NISTIR 5904)

October 28, 1996

Author(s)

Jiann C. Yang, Anthony P. Hamins, N Gorchkov, M Glover

Polymer combustion is a highly complicated process where chemical reactions may occur not only in the gas phase, but also in the condensed phase as well as at the solid-gas interphase. The complication arises due to the coupling between the condensed phase

Evaporation of a Small Aqueous Suppressing Agent Droplet (NISTIR 5904)

October 1, 1996

Author(s)

W. S. Chien, Jiann C. Yang, M D. King, William L. Grosshandler

Due to its ozone-depleting potential, halon 1301 (CF3Br) has been banned from production under the Montreal Protocol. The research for halon replacement(s) has led to the reconsideration of using water in certain applications. However, under cold storage

Minimum Mass Flux Requirements to Suppress Burning Surfaces With Water Sprays (NISTIR 5795)

April 1, 1996

Author(s)

Jiann C. Yang, C I. Boyer, William L. Grosshandler

Experimental measurements of extinguishment times of burning solid fuels using water were conducted using a prototype micronozzle array and a piezoelectric droplet generator. Solid fuels considered included solid white pine, polymethylmethacrylate, and

Rapid Discharge of a Fire Suppressing Agent

January 1, 1996

Author(s)

Jiann C. Yang, William M. Pitts, B D. Breuel, William L. Grosshandler, W G. Cleveland

This paper describes an experimental method to study the rapid discharge of a fire suppressant (C3F8) from a pressurized vessel. Experimental observations inside and at the exit of the vessel were made using high-speed photography. Boiling was not observed

Introductory Remarks (NISTIR 5766)

November 1, 1995

Author(s)

Jiann C. Yang

Objectives of the Workshop: (1) to identify what we know and don't know in gas generator technology for fire suppression; (2) to identify future research areas in gas generator technology for fire suppression; (3) to identify potential users and address

Optimization of System Discharge (NIST SP 890)

November 1, 1995

Author(s)

Jiann C. Yang, Thomas G. Cleary, I Vazquez, C I. Boyer, M D. King, B D. Breuel, C A. Womeldorf, William L. Grosshandler, Marcia L. Huber, L Weber, G. Gmurczyk

Current aircraft fire suppression bottles for dry bay and engine nacelle applications, which are designed to meet Military Specification MIL-C-22284A (proof pressure of 9.62 MPa and minimum burst pressure of 12.37 MPa), are normally filled with liquid