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The porosity of fibrous porous materials is an important factor to the thermal insulating performance of the material. This paper considers both the optimum porosity of uniform fibrous battings and the optimum distribution of the porosity of non-uniform fibrous battings for thermal insulation. The former was determined by an approximate analytical solution and a numerical simulation by using finite...
Penguins, mostly live in the extremely cold Antarctic, are known to have feathers and down, which are light weight, compact and extremely efficient in preventing heat loss. Nevertheless, the mechanisms of heat transfer through the penguin feathers and down, and how the unique characteristics of penguin feathers and down make them such good thermal insulators are not fully understood.In this paper,...
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