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 at densities between 130 260 kg / m 3 . 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 argon and carbon dioxide gases. The heat transfer model is applicable over the temperature range of 300–1360 K, pressure range of 0.133 to 101.3 × 10 3 Pa , and over the insulation density range of 130 260 kg / m 3 in various gaseous environments.


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    Title :

    Heat Transfer Modeling for Rigid High-Temperature Fibrous Insulation


    Contributors:

    Published in:

    Publication date :

    2013-07-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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