English

Analysis of Effective Thermal Conductivities of Honeycomb-Core and Corrugated-Core Sandwich Panels

Equations are derived for the transfer of heat in sandwich panels. An exact method i s developed for considering internal reflections of radiant heat and for reducing the given problem to an equivalent problem which may be solved by well-established black-body methods. Temperature distributions and effective thermal conductivities are calculated for both honeycomb-core and corrugated-core sandwich panels. Equations are derived which give the effective thermal conductivities as functions of the geometric parameters and material properties. A wide range of geometric parameters and material properties is considered. The case in which the emissivity varies through the panel is studied. It is found that if the average emissivity of the two faces is used, the effective conductivity equation gives satisfactory results except at very low emissivity. The effect of uncertainty in the value of emissivity on the accuracy of calculated thermal conductivities is discussed.

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