New Test Method for Thermal Effusivity Using a Modified Transient Plane Source Method
1. Scope
1.1 This test method describes the measurement of thermal effusivity of homogeneous solids over the range of 42 to 31 kW s1/2 m-2 K-1 using a modified transient plane source method at ambient temperature between 20 and 25C. Test specimens are commonly, but not limited to, right circular cylinders 2 to 3 cm in diameter and 0.1 to 3 cm in thickness. 1.2 For the purposes of this test method, any structure may be considered homogeneous if its unit cell area or inhomogeneity size is less than 5 % of the sensor area and the effective cross-section diameter of the unit cell or inhomogeneity is less than 20 % of the penetration depth (described in this test method). NOTE 1--The specimen shall be thicker than the penetration depth. For example, any inhomogeneity in the structure shall be less than 0.2 mm in cross-sectional diameter for a material with a penetration depth of 1 mm. NOTE 2--The purpose of this test method is to provide thermal effusivity measurement instructions to users of modified transient plane source apparatus. This test method does not describe the design or construction of modified transient plane source apparatus. 1.3 Units--SI units are the standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
