Measurement of thermal conductivities of [mmim]DMP/CH3OH and [mmim]DMP/H2O by freestanding sensor-based 3ω technique

Thermal conductivities of [mmim]DMP/CH3OH with mole fraction of [mmim]DMP (x = 0.00, 0.10, 0.20, 0.30, 0.50, 0.70, 0.85, 1.00) and thermal conductivities of [mmim]DMP/H2O with mole fraction of [mmim]DMP (x = 0.025, 0.05, 0.10, 0.20, 0.30, 0.50, 0.70, 0.90, 1.00) at T = 298.15 K were measured by freestanding sensor-based 3ω technique. The zigzag temperature response curves of the sensor were observed and used to extract the specimen thermal conductivity. The total uncertainty in thermal conductivity measurement and the maximum fitting error were estimated to be within 7.7% and 8.0%, respectively. Intuitively, as increasing the mole fraction of [mmim]DMP, the thermal conductivities of both [mmim]DMP/CH3OH and [mmim]DMP/H2O vary exponentially. Through the comparison with the assuming solutions, the heat transfer performances of [mmim]DMP/CH3OH and [mmim]DMP/H2O solutions were evaluated.

► Thermal conductivities of [mmim]DMP/CH3OH and [mmim]DMP/H2O are measured.
► Temperature responses of 3ω sensor are observed to extract thermal conductivities.
► Experimental data are fitted to the “Random Mixing Model” with ARD below 2.5%.
► Thermal conductivities of real solutions are compared with that of assuming solutions.