Accession Number : ADA322889

Title :   A New Technique for the Simultaneous Measurement of Thermal Diffusivity and Thermal Conductivity of Small Energetic-Material Specimens.

Descriptive Note : Final rept. 15 Jan 92-1 Jun 93,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Miller, Martin S. ; Kotlar, Anthony J.

PDF Url : ADA322889

Report Date : MAR 1997

Pagination or Media Count : 40

Abstract : An experimental technique to simultaneously measure the thermal diffusivity and thermal conductivity of small specimens of thermal-insulator materials is described. Experimental conditions that approach the mathematical idealization of a one-dimensional, infinite, two-component, composite solid whose planar interface is subjected to a step-function heat flux are developed. The heat flux is generated by resistive heating of a thin metallic foil. Although this principle has been exploited previously, the present technique permits specimens with volumes two orders of magnitude smaller than prior work based on the same idealization. A number of difficulties related to small specimen volume are identified and overcome. Another improvement over past efforts is the use of nonlinear least squares analysis to determine the optimum values for diffusivity and conductivity. A comparison of measurements of these properties for acrylic and Pyrex glass with literature values suggests that the technique affords accuracies of about 5% for materials in this range.

Descriptors :   *THERMAL CONDUCTIVITY, *SOLID PROPELLANTS, ACRYLIC RESINS, THERMAL DIFFUSION, LEAST SQUARES METHOD, NONLINEAR ANALYSIS, DIFFUSIVITY, HEAT FLUX.

Subject Categories : Ammunition and Explosives
      Solid Rocket Propellants
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE