Category: Transient Plane Source
Keywords: accuracy, Heat Transfer, inertia, low-density, radiation conduction coupling, solid materials, Thermal Conductivity, thermal insulation, thermally active probe, thermograms, TPS, Transient Plane Source, Transient plane source (TPS) method
Abstract: The Hot Disk method is a widely used transient method for thermal property measurements of solid materials. This article, however, highlights two assumptions of the technique; the probe is thermally neutral, and the heat transfer is conductive. The researchers of this article mention an uncertainty of using the Hot Disk technique for measuring low-density and highly insulative materials. Accordingly, numerically noised thermograms of the thermal responses were recorded and applied during measurements, and the best-fitting procedure of the Hot Disk technique was applied. From this, it was determined that the presence of radiation does not affect the accuracy of the measurement, and therefore, the thermal properties recorded are accurate representations of the materials being tested. On a side note, the accuracy of the method may be questionable when measuring materials with drastically different thermal inertia than the probe.
Reference: InternationalJournal of Thermal Sciences, 65, (2013) 242-253