Measurement of liquid thermophysical properties, such as thermal conductivity and thermal diffusivity, is an integral part of heat transfer and thermal processing, This work presents a high precision, laser-baaed thermal pulse technique to simultaneously measure the thermal conductivity and thermal diffusivity of liquids. The experiment is based on a photothermal deflection method in which a CW HeNe laser is used as a probe beam and a NiCr resistance wire immersed in the liquid serves as a heating source. Numerical simulation of the heat conduction and probe beam deflection is used to determine the thermal conductivity and thermal diffusivity of the test liquids from the experimental data. The experimental setup is small, inexpensive and reliable. Results for three liquids, glycerol, I-propanol, and ethanol, are presented with very good agreement found between the measured values and those reported in the literature.
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