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 Ei≤0.01 per linear electric serves thermal pulse, the duration of which is in the range 18≤τu≤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,τi)-T0]. According to the obtained data, the maximum value of this difference is found. Then the approximate value of the thermal diffusivity αapp and volumetric heat capacity cρapp 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.
3 dwg
Title | Year | Author | Number |
---|---|---|---|
METHOD OF MEASURING THERMOPHYSICAL PROPERTIES OF HEAT-INSULATING MATERIALS BY FLAT PULSE HEAT SOURCE | 2015 |
|
RU2601234C1 |
MEASUREMENT METHOD OF THERMAL AND PHYSICAL PROPERTIES OF SOLID MATERIALS BY METHOD OF INSTANTANEOUS FLAT HEAT SOURCE | 2013 |
|
RU2534429C1 |
METHOD OF DETERMINING SPECIFIC HEAT CAPACITY OF MATERIALS | 2013 |
|
RU2523090C1 |
METHOD OF DETERMINING SYSTEM OF THERMOPHYSICAL PROPERTIES OF SOLID MATERIALS | 2008 |
|
RU2374631C2 |
METHOD FOR COMPLEX DETERMINATION OF THERMOPHYSICAL CHARACTERISTICS OF MATERIALS | 2010 |
|
RU2439543C1 |
METHOD OF MEASURING THERMAL DIFFUSIVITY OF HEAT-INSULATING MATERIALS BY REGULAR THIRD KIND MODE TECHNIQUE | 2011 |
|
RU2478939C1 |
METHOD FOR DETERMINING THE RESPONSE TIME OF THE PROTECTION OF CURRENT-CARRYING CONTACT CONNECTIONS OF SWITCHING DEVICES AGAINST OVERHEATING | 2022 |
|
RU2791293C1 |
THERMAL DIFFUSIVITY MEASUREMENT METHOD AND DEVICE (VARIANTS) | 2006 |
|
RU2322662C2 |
DEVICE AND METHOD FOR COMPLEX DETERMINATION OF BASIC THERMOPHYSICAL PROPERTIES OF SOLID BODY | 2013 |
|
RU2530473C1 |
METHOD FOR COMPREHENSIVE EVALUATION OF MATERIAL THERMAL CHARACTERISTICS | 2003 |
|
RU2243543C1 |
Authors
Dates
2017-03-15—Published
2015-11-02—Filed