Category: Transient Plane Source
Author(s): Numan Yüksel
Abstract: This article reviewed the methods that are available to test thermal properties of various insulating materials. These methods can fall under one of two categories: steady state techniques and non-steady (transient) techniques. The hot disk transient plane source (TPS) method is classified as a non-steady state technique. The TPS sensor is a round piece of engraved nickel that conducts electrical currents and is covered with a coating of Kapton, Mica or Teflon. To measure thermal conductivity and thermal diffusivity, the sensor is sandwiched between two identical samples, and it heats the sample in every direction while measuring the temperature increase over time. Hot disk methods are popular because they are quick, and they provide accurate measurements from 0.005 to 500 W/mK for temperatures between 30 and 1200 K. Another advantage of hot disks is that they can test smaller samples than other methods because the size of the sensors can be changed depending on the sample.
Reference: Materials Science: Insulation Materials in Context of Sustainability (2016)