A new analysis method based on the guarded heat flow meter apparatus is proposed to measure the thermal properties of cement-based pastes in a hydrated form. In a steady state, a specimen with 0.4 water-to-cement ratio was found to have a thermal conductivity and a thermal contact resistance of 1.28Wm−1 K−1 and 0.038 m−2 KW−1. A computerized system of heat flow meters provided non-steady ...
The variability within the results presented from the guarded hot-plate (GHP) and guarded heat-flow meter (GHF) methods was determined. Multiple thermal properties of polymethyl methacrylate (PMMA) were analyzed to compare methods. These measurements are taken in the range of −70◦C and +80◦C. Providing reference data for PMMA is the main objective of this paper as well as quantifying the effects of thermal contact of the measuring instruments....
In this paper, a new method is proposed for measuring the through plane thermal conductivity of two catalyst layers of different thicknesses by the guarded heat flow meter (GHF) method, and the transient plane source method (TPS). These catalyst layers were made from two catalyst-coated substrates. The effects of pressing, and hot pressing the layers were also studied and shown to have ...
Thermal conductivity measurements of hydrogen and parahydrogen were taken over a temperature range from their triple point to 1000 Kelvin. A new theoretically based correlation was then adopted that agreed well with existing data and explained the case of the dilute-gas thermal conductivity. The analysis displayed that in the critical region, the enhanced thermal conductivity can be well represented with an equation containing ...
Multiple studies claiming the usefulness of nanofluids for the enhancement of heat transport have been proven ill-founded. Although they have significantly raised thermal conductivities, there is an inerrant increase in viscosity when adding nanoparticles to a liquid. This paper explores areas of research that analyze nanofluid properties that could potiential indicate future applications. A promising direction is using particles that can change ...
