Effect of the Convection Processes in Liquid on Thermal Conductivity Measurement Error by Direct Heating Thermistor Method

Gregory S. Tymchik, Andrey M. Matvienko, Mykola F. Tereschenko, Sergey M. Matvienko


Background. The problems of choosing the optimal utensil diameter for the test liquids on the basis of the investigation of the convection phenomenon effect on the error when measuring the thermal conductivity of liquids by the method of direct heating of a thermistor are considered.

Objective. The aim of the paper is to carry out experimental studies to determine the effect of the convection phenomenon on the error in measuring the thermal conductivity of liquids.

Methods. An estimation of the thermistor heating temperature measuring accuracy by the method of direct heating of the thermistor for the test liquid in utensils of different diameters in determining the coefficient of thermal conductivity is carried out. Series of experimental research was carried out with the help of a device for measuring the liquids TPC in order to determine the optimum design of the probe and the thermostat, to select the optimum volume of the material research and to choose the materials of construction.

Results. The results of experimental research with control liquids using the developed instrument based on the method of direct heating of the thermistor are presented, the thermistor heating temperature fluctuation values depending on the utensil diameter with the test liquid are determined.

Conclusions. It is substantiated that when designing devices for measuring the TPC of liquids, it is necessary to take into account the individual properties of the liquids under investigation and to create the greatest possible uniform heating or cooling of the utensil with the test material. Also, it is necessary to use the minimum diameter utensils. It is recommended to use utensils for the test liquid with a diameter of up to 10 mm to reduce the error in measuring the liquid thermal conductivity.


Thermal conductivity; Direct heating thermistor method; Thermophysical characteristics of liquid materials


S.V. Ponomarev et al., “Estimation of errors in measuring the thermophysical properties of solid materials”, Izmeritelnaya Tekh­nika, no. 1, pp. 44–47, 2004 (in Russian).

S.V. Ponomarev et al., Theoretical and Practical Basis of Thermophysical Measurements. Moscow, Russia: Fizmalit, 2008 (in Russian).

D.V. Akulenko et al., “The measurement of thermal conductivity medium using a direct heating thermistor method”, in Proc. Problems of Technogenic Security and Sustainable Development, no. 3, pp. 49–52, 2012 (in Russian).

S. Matvienko et al., “Investigation of thermal conductivity of materials by means of pulsed thermistometry method”, Vіsnyk Kremenchuts'kogo Natsіonal'nogo Unіversitetu іm. M. Ostrograds'kogo, vol. 95, no. 6, pp. 106–112, 2015 (in Ukrainian).

R.T. Atkins et al., “Thermistor-based thermal conductivity measurement system”, U.S. Army Corps of Engineers Cold Regions Research & Engineering Laboratory, Special Report 90-24, pp. 1–11, 1990.

R.T. Atkins, “Thermal conductivity measurement method”, U.S. Patent 04522512, 1985.

S. Matvienko et al., “Increasing accuracy of measuring thermal conductivity of liquids by using the direct heating thermistor method”, Eastern-European J. Enterprise Technol., vol. 4, no. 5, pp. 20–30, 2016. doi: 10.15587/1729-4061.2016.75459

M.E. Orlov, Theoretical Foundations of Heat Engineering. Heat and Mass Exchange. Ulyanovsk, Russia: Ulyanovsk State Technical University, 2013 (in Russian).

A.P. Vragov, Heat Exchange Processes and Equipment for Chemical and Gas Refineries. Sumy, Ukraine: Sumy State University, 2006 (in Russian).

K.A. Woodbury, “An experimental and analytical investigation of liquid moisture distribution in roof insulating systems”, Ph.D. thesis, Virginia Polytechnic Institute and State University, 1984.

M.F. Tereshchenko et al., “Principles of constructing modern ultrasound therapeutic devices”, Vіsnyk NTTU KPІ. Ser. Prilado­buduvannya, vol. 40, pp. 136–143, 2010 (in Ukrainian).

G.S. Tymchik et al., Tangents of Control and Measuring Systems. Kyiv, Ukraine: NTUU KPІ, 2008 (in Ukrainian).

G.S. Tymchik et al., Sensors of Electromagnetic Radiation for Biotechnical Research. Kyiv, Ukraine: MP Lesya, 2004 (in Ukrainian).

F.M. van Gelder, “A thermistor based method for measurement of thermal conductivity and thermal diffusivity of moist food materials at high temperatures”, Ph.D. thesis, Virginia Polytechnic Institute and State University, 1998.

R.R. Kravets, “Determination of thermal conductivity of food materials using a bead thermistor”, Ph.D. thesis, Virginia Polytechnic Institute and State University, 1988.

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