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The rate of cooling of a material in air, or with no barrier between materials

  1. Jun 5, 2009 #1
    I'm unsure how to approach this, as solid blocks of materials next to each other (e.g. steel and air) with no barrier inbetween as shown on
    http://en.wikipedia.org/wiki/Thermal_conductivity
    "x" would equal zero, this can't be correct. Is there another equation relating temperature difference, area and conductivity of two adjacent materials? Possibly also mass, volume or density? All I really want is a rate of heat loss via conduction in Watts or Watts/m². I know how to calculate Black Body ratiation via the Stefan-Boltzmann constant.
     
  2. jcsd
  3. Jun 5, 2009 #2

    mgb_phys

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    The thermal conduction of a junction is a little different
    Assuming both surfaces are clean and smooth it largely depends on pressure.

    see http://en.wikipedia.org/wiki/Thermal...ct_conductance [Broken]
     
    Last edited by a moderator: May 4, 2017
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