Thermal Characteristics of Gas-Filled Fiber Powder Insulation Systems

  • Decatur B. Rogers
  • John W. Williamson


This investigation was initiated to study gas-filled fiber-powder insulations. It has been experimentally shown that these systems may exhibit a thermal conductivity as low as one-half that of air. Selected gas-filled, fiber-powder systems were measured and the important role that powder particle size plays was demonstrated. The powders which were investigated included carbon black, perlite, flame-prepared silica, and silica-carbon black mixtures.

The existing theoretical model of Luikov, Shashkov, Vasiliev, and Fraiman was used for gas-filled powders and extended to the case of gas-filled, fiber-powder systems by adding Bankvall’s theoretical model for fibrous materials. These models are useful in evaluating candidate powders and gases and they can be used to establish conductivity limits of gas-filled powder systems.


Thermal Conductivity Carbon Black Fumed Silica Silica Aerogel Powder System 
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Copyright information

© Purdue Research Foundation 1978

Authors and Affiliations

  • Decatur B. Rogers
    • 1
  • John W. Williamson
    • 2
  1. 1.Prairie View A & M UniversityPrairie ViewUSA
  2. 2.Vanderbilt UniversityNashvilleUSA

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