Application of the Regular Mode Method to the Experimental Determination of Thermal Conductivity of Fluid

The article discusses widely used methods for determining the thermal conductivity of a nanofluid: the heated filament (wire) method and the 3ω-wire method. It is proposed to use the regular mode method to determine the thermal conductivity. The design features of the measuring calorimeter and the experimental methodology are demonstrated: the duration of the experiment should be at least 800 s with a coefficient of heat transfer from the thermostatic fluid to the calorimeter surface of at least 2000 W/(m 2 K). Studies conducted on distilled water showed a deviation from the tabulated data by 10–11%. Further studies using calorimeters of other designs seem promising.