METHOD OF MEASURING THERMAL PROPERTIES OF ANISOTROPIC MATERIALS BY LINEAR IMPULSE OF HEAT SOURCE Russian patent published in 2017 - IPC G01N25/18 

FIELD: heating.

SUBSTANCE: measuring, a method of thermophysical properties of materials using linear anisotropic pulsed heat source consisting in that the sample of the material produced in the form of two massive plates, between which a linear electric heater and a temperature gauge are placed. In the preparatory phase of the experiment the resulting system is kept at a predetermined initial temperature T₀, with constant spacing in time Δτ measured temperature difference , and since the n-th step, the control of the indicator value , n = const is selected from the range of 2≤n≤10. When the criterio E_i≤0.01 per linear electric serves thermal pulse, the duration of which is in the range 18≤τ_u≤24 c. During the active phase of the experiment carried out with a constant pitch measurement and registration of changes in time of a temperature difference [T(r,τ_i)-T₀]. According to the obtained data, the maximum value of this difference is found. Then the approximate value of the thermal diffusivity α_app and volumetric heat capacity cρ_app test material are determined, and the magnitude and is found, the distance between the linear electric heater and a temperature gauge and , and the optimum duration of the thermal pulse . The distance between the temperature measurement and heater is calculated as linear mean value and then through a series of experiments at a predetermined linear orientation of the electric heater and the temperature of the sample relative to the principal axes of symmetry of the meter, and the measurement is carried out by subsequent processing of the data in the found values , , , . As a result, we find the values depending on the desired thermal diffusivity and specific heat and bulk cρ of the material of the orientation of the linear heater and temperature measuring instrument with respect to the principal axes of symmetry of the sample.

EFFECT: improved accuracy of measurement of thermal properties of anisotropic materials.

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