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On the use of guarding heaters to create adiabatic conditions in thermophysical experiments

A.K. Sokolov

Vestnik IGEU, 2025 issue 6, pp. 28—35

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Abstract in English: 

Background. The thermophysical characteristics of materials are mainly determined by solving inverse problems of thermal conductivity over temperature fields obtained as a result of thermophysical experiments. To simplify the subsequent processing of the measured values of the temperature field parameters, in most cases they try to use one-dimensional temperature fields of unlimited plates or cylinders, which are created by organizing symmetrical heating or using special guarding heaters. Thus, the task to study the influence of guarding heaters on the temperature field of the plate is very relevant.

Materials and methods. The paper analyzes and checks the effectiveness of the method for creating adiabatic conditions using guarding heaters. To study the effect of guarding heaters on the temperature field of the material under study, a numerical-analytical model of the process and a computer program have been developed.

Results. Calculations of the temperature fields of a material (steel) in the form of a truncated cylinder and a ring with a guarding heater have been carried out. The error of creating adiabatic conditions for several methods of regulating the power of a guarding heater has been estimated.

Conclusions. It is established that none of the operating modes of the guarding heater can in principle create conditions of perfect adiabatic operation. It is shown that it is possible to select the parameters of a physical experiment at which the error of creating adiabatic conditions can be reduced to acceptable values.

 

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Key words in Russian: 
теплофизический эксперимент, адиабатные условия, охранный нагреватель, задачи теплопроводности, численно-аналитическая метод
Key words in English: 
thermophysical experiment, adiabatic conditions, guarding heater, heat conduction problems, numerical-analytical method
The DOI index: 
10.17588/2072-2672.2025.6.028-035
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