Modeling the NASA/ASTM Flammability Test for Metallic Materials Burning in Reduced Gravity

Steinberg, T. A. and Wilson, B. D. (2000). Modeling the NASA/ASTM Flammability Test for Metallic Materials Burning in Reduced Gravity. In: T. A Steinberg, B. E. Newton and H. D. Beeson, Flammability and Sensitivity of Materials in Oxygen-Enriched Atmospheres. Ninth International Symposium on Flammability and Sensitivity of Materials in Oxygen-Enriched Atmospheres, Paris, France, (266-291). September 2000. doi:10.1520/STP12501S


Author Steinberg, T. A.
Wilson, B. D.
Title of paper Modeling the NASA/ASTM Flammability Test for Metallic Materials Burning in Reduced Gravity
Conference name Ninth International Symposium on Flammability and Sensitivity of Materials in Oxygen-Enriched Atmospheres
Conference location Paris, France
Conference dates September 2000
Proceedings title Flammability and Sensitivity of Materials in Oxygen-Enriched Atmospheres
Journal name Flammability and Sensitivity of Materials in Oxygen-Enriched Atmospheres: Ninth Volume
Place of Publication Saline, Michigan, USA
Publisher ASTM
Publication Year 2000
Sub-type Fully published paper
DOI 10.1520/STP12501S
ISBN 0-8031-2871-1
ISSN 1040-1695
Editor T. A Steinberg
B. E. Newton
H. D. Beeson
Volume 9
Start page 266
End page 291
Total pages 26
Collection year 2000
Language eng
Formatted Abstract/Summary
Flammability tests of iron using the Lewis Research Center's (LeRC) 2.2 s drop tower are modeled. Under the conditions of the test, after ignition, about 2.0 s of burning in reduced gravity (0.01-0.001 g) occurs. Observations (film and video) show the accumulating product mass to be well-mixed; therefore the system is modeled as a semi-batch reactor, that is, reactants continuously fed with the product accumulating in the reactor. The regression of the melting sample is considered steady-state. Real-time temperature and pressure measurements of the chamber gas provide measurements for model validation. The model consists of a set of 22, non-linear, first-order differential equations which are solved using MATLAB®. The model predicts, for 0.32-cm-diameter iron rods burning at 4300 kPa, an average reaction temperature of 3600 K and a molten oxide temperature of 3400 K. The system experimental parameters are the thermal conductivity of the molten liquid, kFe(ℓ), the thermal conductivity of the molten iron oxide mixture, kFeO(ℓ), and the heat transfer coefficient, h, between the molten oxide and the oxygen in the chamber and chamber itself. These model parameter values are: kFe(ℓ)=1.4 J/s cm K, 1.8 ⩽ kFeO(ℓ) ⩽ 35.0 J/s cm K, and 0.24 ⩽ h ⩽ 2.24 J/s cm2 K. It is suggested that the internal circulation within the molten ball formed during burning decreases as the ball grows. More work is necessary to understand the chemical nature of the reacting oxygen and determine the species formed during burning

Subjects E1
780102 Physical sciences
299902 Combustion and Fuel Engineering
Keyword iron combustion
reduced gravity combustion
microgravity combustion
reaction rate
burning metals
heterogeneous combustion
metal oxidation
metal combustion
Q-Index Code E1

Document type: Conference Paper
Collection: School of Chemical Engineering Publications
 
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Created: Fri, 06 Jun 2008, 13:22:59 EST