SU1684641A1 - Method of determination of heat conductivity of anisotropic materials - Google Patents

Abstract

This invention relates to thermal physics, in particular to the determination and control of thermal conductivity coefficients of materials. The goal is to expand the class of materials under study by determining the thermal conductivity of materials with an arbitrary orientation of the main anisotropy axes. For this, the temperature of the samples is measured simultaneously by two sensors, one of which is located in the center of the circular heat source located in the reference body at the interface of the samples, and the other outside of it at the distance Ri I R2, where RI is the radius of the heat source; R2 is the base radius of the reference sample. From the solution of the inverse problem of heat conduction, the coefficients of heat conduction are determined along the normal to the surface of the sample and along its surface along the line of location of the sensors. By turning one of the samples relative to the center of the heat source, it is possible to determine the thermal conductivity coefficients in any direction tangential to the surface of the sample under study. 1 il. (Ls

Description

This invention relates to thermal physics, in particular to the determination and control of thermal conductivity coefficients of materials.

The aim of the invention is to expand the class of materials under investigation by determining the thermal conductivity of materials with an arbitrary orientation of the main anisotropy axes.

The method is carried out as follows.

The sample and the standard are heated by a circular heat source located in the area of their contact, and the temperature of the samples is measured simultaneously in the center of the circular heat source and outside it, rotating one of the samples relative to the center of the source

heat, after which the heat conductivity coefficients are determined from the solution of the inverse heat conduction problem. At the same time, surface heat sounding is carried out without destroying the sample of arbitrary shape with the directions of the main axes of heat conduction unknown in advance. A temperature sensor located in the center of the circular heat source allows determining the thermal conductivity of the sample under study normal to the plane of contact of the samples. Rotation relative to the center of the circular heat source by means of the second temperature sensor makes it possible to determine thermal conductivity coefficients in any direction tangentially to

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sample surface by solving the inverse problem of heat conduction.

The implementation of the method is illustrated in the drawing.

Reference sample 1 of radius R2 and test sample 2 are brought into thermal contact through a circular source 3 of thermal energy of radius RL Temperature sensor 4 is embedded on the surface of the heat source in contact with the surface of the material under study. It records the resulting temperature between the heat source and the sample under test.

Sensor 5 is at a distance RI K R2 from the heat source and is thermally insulated. It records the heat wave in the test sample propagating from the heat source. From the temperature values at the places of the sensor termination, the coefficients of thermal conductivity in an anisotropic body are determined in the direction normal to the surface of the sample and along the surface along the line of the location of the temperature sensors, solving the inverse problem of thermal conductivity.

By turning one of the samples relative to the center of the heat source, the temperature is measured in the other direction. In this way, it is possible to determine the thermal conductivity of the sample in any direction along the tangent to the plane of the material.

The proposed method allows the determination of the thermal conductivities of anisotropic materials of arbitrary shape with previously unknown directions of the main anisotropy axes without destroying the sample.

f o rm u l a i z o brie n i

The method for determining the thermal conductivity of anisotropic materials, including the heating of the reference and test samples by a source of thermal energy, measurement

temperature sensor being moved at a fixed distance from the source, characterized in that, in order to expand the class of materials under investigation by determining the thermal conductivity of materials with an arbitrary orientation of the main anisotropy axes, the samples are heated by a circular heat source in the area of their contact and simultaneously with the sensor temperature measurement located at a distance from the source, the temperature of the samples is measured at the center of a circular heat source, rotating one of the samples relative to the center ugovogo heat source, and the coefficients teplopro0 water content was determined from the solution of the inverse heat conduction problem.

Claims (1)

Claim A method for determining the thermal conductivity of anisotropic materials, including heating the reference and test samples with a heat source, measuring the temperature with a movable sensor located at a fixed distance from the source, characterized in that, in order to expand the class of materials being studied by determining the thermal conductivity of materials with an arbitrary orientation of the main anisotropy axes , the samples are heated with a circular heat source in the area of their contact and simultaneously with the temperature measurement by the sensor, aspolozhennym at a distance from the source, the sample temperature is measured at the center of the circular heat source by turning one of the circular sample relative to the center of the heat source, and heat conductivity coefficients determined from the inverse heat conduction problem.