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Heat Transfer in Microsphere Insulation in the Presence of a Gas

  • G. R. CunningtonJr.
  • C. L. Tien

Abstract

Evacuated porous materials have seen wide use as cryogenic insulations for many years [1,2] and numerous studies [2–9] have addressed the technology of heat transport in these powder, fiber, foam and multilayer types of insulation. Although they are comprised of a wide variety of materials, the mechanisms of heat transfer by radiation and solid conduction within the media are well understood. However, when a fluid is present in the void spaces between and/or within particles the heat transport is less well defined, particularly at cryogenic temperatures and in the pressure range intermediate to free molecular and continuum regimes [10–12].

Keywords

Heat Transfer Knudsen Number Solid Conduction Cryogenic Engineer Apparent Thermal Conductivity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Purdue Research Foundation 1978

Authors and Affiliations

  • G. R. CunningtonJr.
    • 1
  • C. L. Tien
    • 2
  1. 1.Lockheed Palo Alto Research LaboratoryPalo AltoUSA
  2. 2.University of CaliforniaBerkeleyUSA

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