Measurement Of Thermal Conductivity Of Liquid By Using Transient Hot Wire Method

More and more reliable data of thermal conductivity of liquid for chemical engineering design will be needed. Meanwhile, the research of mechanism of thermal conductivity of liquid also depends on its experimental data. However, the experimental data of thermal conductivity of liquid, especially for mixtures and other complex systems, are limited. Therefore, the development of a reliable apparatus for measuring thermal conductivity of liquid is essential.Based on the state-of-art review for measuring thermal conductivity of liquid, the transient hot wire method was chosen in this thesis. Through design, assembly, adjusting, a new transient hot wire apparatus was developed to measure the thermal conductivity of liquid. In the apparatus, natural convection was avoided in the effective duration, signal noise level was suppressed through effective denoising, and automatic acquisition for signal was also realized. The apparatus was calibrated by the literature data, and the reliability of the apparatus was confirmed. The error analysis for the apparatus was given as well, and maximum uncertainty was 2.39%.Due to the extensive application of methyl ethyl ketoxime-methyl ethyl ketone and methyl ethyl ketoxime-n-hexane systems in the production related to methy ethyl ketoxime, their thermal conductivity were measured in the range from 288K to 328K for five compositions at atmospheric pressure. The dependences of thermal conductivity on temperature and composition were discussed. In addition, the experimental data were correlated, and maximum deviations were 0.35% and 0.84%, respectively, average absolute deviations were 0.13% and 0.36%, respectively.Thermal conductivity of aqueous DMSO solution, which was widely studied in the molecular dynamic simulation as a high associating system, were measured in the range of 296K-326K for nine compositions at atmospheric pressure. It is found that temperature dependence of thermal conductivity makes a sharp change at DMSO mole fraction range from 0.48 to 0.675.