Accuracy Improvement of Thermal Conductivity Measurement of Liquids Used by Direct Heating Thermistor Method

Background. This work addresses the determination accuracy improvement of thermal conductivity of liquids by direct heating thermistor method. Objective. The aim of the paper is the determination accuracy improvement of thermal conductivity of liquids by analysis of possible measurement errors and development of methods and means of their reduction. Methods. Types of materials' thermal conductivity measurement errors are identified, which allowed differentially approach to their analysis. The introduction of appropriate correction factors, determined through the use of standard liquids, was proposed to reduce the error of the measurement method. Results. Main causes of errors in the research are considered and effective ways to reduce them are provided. The possibility of reducing the measurement error by accumulating the data of multiple observations and their statistical processing is justified. Conclusions. Results of experimental studies with control materials using established device, which showed high accuracy and efficiency for measuring the thermal conductivity of liquids are presented.