A Noncontact Method for Measuring Thermal Conductivity and Thermal Diffusivity of Anisotropic Materials

摘要

A noncontact method for measuring the thermal conductivity and thermal diffusivity of anisotropic materials is proposed. This method is based on the Fact that the surface temperature variation with time depends on the thermal proper- ties of the material when its surface is heated locally. The three-dimensional transient heat conduction equation in the material is solved numerically. The dimensionless average surface temperature variations are obtained along each principal axis: that is, the x and y axes. The relation between the dimensionless , temperature and the Fourier number is expressed by a polynomial equation and used as a master plot, which is a basic relation to be compared with measured temperature variation.