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

AI Thread Summary
The discussion centers on calculating the rate of heat loss via conduction between solid materials, specifically steel and air, without barriers. The original poster questions the validity of using a thermal conductivity value of zero for adjacent materials, suggesting that a different equation may be necessary to relate temperature difference, area, and conductivity. They seek a formula that incorporates mass, volume, or density to determine heat loss in Watts or Watts/m². The conversation highlights the importance of surface conditions and pressure in thermal conduction calculations. Accurate modeling of heat transfer requires considering these factors for precise results.
andythecc
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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.
 
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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
 
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