Experimental characterization demonstrates thermal diffusivity dependence on density and cell size in polyethylene foams, suggesting enhanced models for thermal insulation.
Thermal diffusivity and specific heat at constant pressure of a collection of crosslinked closed cell polyethylene foams have been measured at room temperature using the transient plane source (TPS) method. A theoretical model to predict the thermal diffusivity has been proposed. The predictions of this model are in good agreement with the observed experimental trends. The theoretical model predicts a dependence of the thermal diffusivity on the density and other foam characteristics such as carbon black content and cell size.
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Almanza et al. (2004) studied this question.
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