This method specifies how to determine the thermal conductivity and thermal diffusivity, and hence the specific heat capacity per unit volume, of solids and fluids. The experimental arrangement can be designed to match different specimen sizes and measurements can be made in gaseous and vacuum environments at a range of temperatures and pressures. The method is suitable for testing homogeneous and isotropic materials, as well as anisotropic materials with a uniaxial structure. The homogeneity of the material should extend throughout the specimen and no thermal barriers (except those next to the probe) should be present within a range defined by the probing depth of the transient experiment. The method is suitable for materials having values of thermal conductivity, , in the approximate range 0.030 Wm1K1 500 Wm1K1 and values of thermal diffusivity, , in the range 107 m2s1 104 m2s1, and for temperatures, T, in the approximate range 50 K T 1200 K. The specific heat capacity per unit volume, C, can be obtained by dividing the thermal conductivity, , by the thermal diffusivity, , i.e. C = /, and is in the approximate range 0.005 MJm3K1 C 5 MJm3K1.
KeywordsThermal Conductivity, Thermal Diffusivity, Transient Plane Source, Hot Disc Method
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top