APPARENT THERMAL DIFFUSIVITY OF COMPOSITE FABRIC LAYERS
QUARTERMASTER RESEARCH AND ENGINEERING COMMAND NATICK MA NATICK United States
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A mathematical derivation of an apparent thermal diffusivity for a generalized composite fabric system consisting of different cloth layers is presented to provide a parameter for analysis of unidimensional heat flow in a clothing system. An experimental method is described for obtaining the apparent thermal diffusivity as a general solution to Fouriers Conduction Equation, using a boundary step change on a semi-infinite solid composed of dissimilar fabric layers. Also presented are several specific examples of transient heat flow in dual layer systems. The apparent diffusivities of each system are obtained both theoretically and experimentally, and the results compared graphically.