Accession Number N20120011873
Title Heat Transfer Modeling for Rigid High-Temperature Fibrous Insulation.
Publication Date Jun 2012
Media Count 11p
Personal Author G. R. Cunnington J. R. Knutson K. Daryabeigi
Abstract Combined radiation and conduction heat transfer through a high-temperature, high-porosity, rigid multiple-fiber fibrous insulation was modeled using a thermal model previously used to model heat transfer in flexible single-fiber fibrous insulation. The rigid insulation studied was alumina enhanced thermal barrier (AETB) at densities between 130 and 260 kilograms per cubic meter. The model consists of using the diffusion approximation for radiation heat transfer, a semi-empirical solid conduction model, and a standard gas conduction model. The relevant parameters needed for the heat transfer model were estimated from steady-state thermal measurements in nitrogen gas at various temperatures and environmental pressures. The heat transfer modeling methodology was evaluated by comparison with standard thermal conductivity measurements, and steady-state thermal measurements in helium and carbon dioxide gases. The heat transfer model is applicable over the temperature range of 300 to 1360 K, pressure range of 0.133 to 101.3 x 10(exp 3) Pa, and over the insulation density range of 130 to 260 kilograms per cubic meter in various gaseous environments.
Keywords Aluminum oxides
Fibers
Flexibility
Insulation
Mathematical models
Nitrogen
Pressure distribution
Radiative heat transfer
Rigid structures
Scanning electron microscopy
Steady state
Thermal conductivity


 
Source Agency National Aeronautics and Space Administration
NTIS Subject Category 46B - Fluid Mechanics
Corporate Author National Aeronautics and Space Administration, Hampton, VA. Langley Research Center.
Document Type Conference proceedings
Title Note N/A
NTIS Issue Number 1226
Contract Number N/A

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