Heat and Mass Transport From Thermally Degrading Thin Cellulosic Materials in a Microgravity Environment

A theoretical model describing the behavior of a thermally thin cellulosic sheet heated by external thermal radiation in a quiescent microgravity environment is developed. This model describes thermal and oxidative degradation of the sheet and the heat and mass transfer of evolved degradation produc...

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Bibliographic Details
Published in:Journal of heat transfer 1992-05, Vol.114 (2 Ma), p.494-502
Main Authors: Kushida, G, Baum, H. R, Kashiwagi, T, di Blasi, C
Format: Article
Language:English
Subjects:
400800 - Combustion, Pyrolysis, & High-Temperature Chemistry
Applied sciences
CARBOHYDRATES
CELLULOSE
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION KINETICS
Combustion of solid fuels
Combustion. Flame
DECOMPOSITION
Energy
ENERGY TRANSFER
Energy. Thermal use of fuels
Exact sciences and technology
Fluid Mechanics And Heat Transfer
HEAT TRANSFER
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
KINETICS
MASS TRANSFER
MATHEMATICAL MODELS
ORGANIC COMPOUNDS
POLYSACCHARIDES
PYROLYSIS
RADIANT HEAT TRANSFER
REACTION KINETICS
SACCHARIDES
Theoretical studies. Data and constants. Metering
THERMAL DEGRADATION
THERMOCHEMICAL PROCESSES
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Summary:A theoretical model describing the behavior of a thermally thin cellulosic sheet heated by external thermal radiation in a quiescent microgravity environment is developed. This model describes thermal and oxidative degradation of the sheet and the heat and mass transfer of evolved degradation products from the heated cellulosic surface into the gas phase. At present, gas phase oxidation reactions are not included. Without buoyancy, the dominant vorticity creation mechanism in the bulk of the gas is absent except at the material surface by the requirement of the no-slip condition. The no-slip condition is relaxed, permitting the flow to be represented by a velocity potential. This approximation is permissible due to the combination of a microgravity environment and low Reynolds number associated with slow small-area heating by external radiation. Two calculations are carried out: heating without thermal degradation, and heating with thermal degradation of the sheet with endothermic pyrolysis, exothermic thermal oxidative degradation, and highly exothermic char oxidation. The results show that pyrolysis is the main degradation reaction. Moreover, self-sustained propagation of smoldering for cellulosic materials is very difficult due to the lack of sufficient oxygen supply in a quiescent environment.
ISSN:0022-1481
1528-8943
DOI:10.1115/1.2911300