Nanofluids are used to improve the thermal conductivity of heat transfer fluids. This study examined the effects on thermal conductivity of zinc oxide (ZnO)/ethylene glycol + water nanofluids as increasing concentrations of ZnO nanopartilces were added to the solution. A Thermal Constants Analyzer (TPS) measured the thermal conductivity of the nanofluids using the Transient Plane Source (TPS) method. As expected, the thermal conductivities of the solutions increased with nanoparticle concentration, ...
Methyl and ethyl alcohol have good thermophysical characteristics for use in refrigeration systems. The purpose of this study was to measure the thermal conductivity of ethyl and methyl alcohol solutions to determine if they can become competitive secondary fluids. A Thermal Constants Analyzer measured the thermal conductivity of various 20-wt% ethyl alcohol and 20 wt-% propyl alcohol solutions using the Transient Plane Source (TPS) method. Measurements were taken after 1, 2, and 3 seconds ...
H2O/KCOOH (potassium formate) is a highly soluble hygroscopic salt solution that has the potential to be used as a desiccant. However, the thermophysical properties of H2O/KCOOH are only available for concentrations between 20-50%, which is not beneficial for their use as dehumidifiers. In this paper, a TPS system was used to measure the thermal conductivity of H2O/KCOOH solution with salt concentrations of 60-80% between 1 °...
Numerical models for the calculation of thermal conductivity and rheology behavior of alumina and multi-walled carbon nanotube (MWCNT) nanofluids were evaluated by determining these properties experimentally and comparing the results to the models. The thermal conductivity was measured by the transient plane source method, and the dynamic viscosity was determined using a rotational rheometer. A new model was then developed for these nanofluids, including the effects of interfacial thermal resistance. ...
Polyactic acid (PLA)-micro hexagonal boron nitride (hBN)-graphene nanoplatelet (GNP) polymer composites were prepared, and the effects of varying filler contents on the thermal and mechanical properties of the polymer composites were investigated. It was determined that the addition of the GNPs resulted in a decrease in thermal conductivity in comparison to a PLA-hBN composite unless the GNP:hBN ratio was 1:1, where the thermal conductivity was equal to that ...
