Accession Number : AD0276838

Title :   APPARENT THERMAL DIFFUSIVITY OF COMPOSITE FABRIC LAYERS

Corporate Author : QUARTERMASTER RESEARCH AND ENGINEERING COMMAND NATICK MASS

Personal Author(s) : BOTSCH,FRANCIS W. ; POWERS,JAMES J. ; SACCO,MICHAEL J.

Report Date : JUL 1961

Pagination or Media Count : 1

Abstract : 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 Fourier's 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. (Author)

Descriptors :   *TEXTILES, CLOTHING, COMPOSITE MATERIALS, HEAT TRANSFER, MATHEMATICAL ANALYSIS, THERMAL CONDUCTIVITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE