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ST7-1.30.10.4 Approximating an Air Gap in Thermal Analysis
A common situation in thermal analysis is when two adjacent surfaces are separated by an air gap. Examples include internal walls subjected to fire, and the gaps between double and triple glazed windows. In such cases, convective cells form between the two surfaces, and radiative heat exchange may also be significant if higher temperatures are involved. Without the use of CFD, we can approximate the effective thermal conductivity of the gap and fill it with elements which match this conductivity.
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