Accession Number : AD0607288

Title :   IGNITION OF BLACK ALPHA-CELLULOSE PAPERS BY THERMAL RADIATION, SQUARE WAVE PULSE

Descriptive Note : Interim technical rept.,

Corporate Author : CALIFORNIA COMPUTER PRODUCTS INC DOWNEY

Personal Author(s) : Sauer, F M

PDF Url : AD0607288

Report Date : Sep 1956

Pagination or Media Count : 35

Abstract : Available data on critical energies for sustained ignition of black alpha-cellulose paper in the absence of forced convective heat losses are correlated against exposure time on a nondimensional basis. Investigations cover a range of irradiance from 2 to 25 cal/sq cm sec, exposure time from 0.1 to 4 seconds, and paper thickness from 2 to 30 mils. Ignition energies for papers of two nominal densities were determined. Results are presented in terms of an energy modulus and the Fourier modulus for a constant value of E/RT sub o equal to 44. For Fourier moduli less than 0.4, the energy modulus approaches a constant value of approximately 0.11. As the Fourier modulus increases, the energy modulus decreases to a minimum value of 0.068 at a Fourier modulus of 0. 8. For Fourier moduli above 0.8, the energy modulus increases with exposure time according to a given equation. Regions of ignition, transiet flaming, destruction (without flame), and nondestruction are illustrated in terms of the above-mentioned dimensionless moduli.

Descriptors :   *FIRES, *NUCLEAR EXPLOSION DAMAGE, *PAPER, CELLULOSE, COMBUSTION, DENSITY, FLAMES, IGNITION, MOISTURE, PYROLYSIS, THERMAL PROPERTIES, THERMAL RADIATION, THICKNESS

Subject Categories : Safety Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE