Category: Transient Plane Source
Keywords: density, Measurement of Liquids, Measurement Time, Nanofluids, Natural convection, Prandtl Number, Sensor Power, Temperature, Thermal Conductivity, Thermal Diffusivity, TPS Technique, Volumetric Heat Capacity
Abstract: The authors state that the Hot Disk TPS technique isn't an accurate method for the measurement of thermal conductivity, thermal diffusivity and volumetric heat capacity of liquids. This is due to the effects of natural convection caused by the sensor which introduce a significant error in the measurements. Six commonly known liquids were investigated using the TPS technique and the obtained values were compared to literature and were found to be significantly different. The authors proposed a new methodology that is able to produce more accurate thermal conductivity values when measuring liquids. In addition, if volumetric heat capacity is known for a given liquid, it can be used as an input to increase the accuracy of measurements.
Reference: International Journal of Heat and Mass Transfer, 71 (2014) 790-807