Measurement of thermophysical porperties of solids by arbitrary heating. III - Measurement of thermal diffusivity and thermal conductivity of cylindrical or hollow cylindrical specimen

A Laplace transform method is developed to measure the thermal diffusivity and thermal conductivity of a cylindrical or hollow cylindrical solid sample. The cylindrical sample is tightly enclosed in a hollow cylindrical sample and the temperature responses are detected at four sites in both samples which are heated from the periphery or the central part. The principal systems for measuring the thermal diffusivity of cylindrical, hollow cylindrical, and infinitely large samples are examined, and a practical system for the simultaneous measurement of these values is developed. The method is evaluated by a numerical test and the measuring errors are examined. An example of the test section and test apparatus is presented for the thermal diffusivity measurement on a stainless steel bar and for a simultaneous measurement on alumina and solidified-molten salt.