RU99103718A - METHOD FOR INTEGRATED DETERMINATION OF THERMOPHYSICAL PROPERTIES OF MATERIALS - Google Patents
METHOD FOR INTEGRATED DETERMINATION OF THERMOPHYSICAL PROPERTIES OF MATERIALSInfo
- Publication number
- RU99103718A RU99103718A RU99103718/28A RU99103718A RU99103718A RU 99103718 A RU99103718 A RU 99103718A RU 99103718/28 A RU99103718/28 A RU 99103718/28A RU 99103718 A RU99103718 A RU 99103718A RU 99103718 A RU99103718 A RU 99103718A
- Authority
- RU
- Russia
- Prior art keywords
- heater
- value
- determined
- temperature difference
- dynamic parameter
- Prior art date
Links
- 238000005259 measurement Methods 0.000 claims 3
- 238000000926 separation method Methods 0.000 claims 1
Claims (1)
где b1i определяют согласно формулам
где T*j - разность температур на j шаге измерения, Δτ - промежуток времени через который производятся измерения, k - целое положительное число большее 3, b1max - максимальное значение по абсолютной величине из всех b1i, сравнивают величину динамического параметра с наперед заданным значением, испытания заканчивают при превышении контролируемым динамическим параметром заданного значения определяют тепловую активность исследуемого материала исходя из закономерностей распространения тепла в плоском и сферическом полупространствах
где - постоянные, определяемые конструктивными и режимными параметрами, применяемого устройства, реализующего способ, d1, b0, b1 - коэффициенты, непосредственно определяемые из снятой зависимости разности температур между нагревателем и точкой плоскости контакта образца и эталонного тела от времени, далее рассчитывают величину затем при δε ≅ 0,1 рассчитывают тепловую активность и теплопроводность исследуемого материала по формулам
где B2, λ′ - постоянные, определяемые конструктивными и режимными параметрами, применяемого устройства, реализующего способ.A method for comprehensively determining the thermophysical properties of materials, namely, that the test body is brought into thermal contact with the reference body along a plane in which a constant-power local heater in the form of a circle is located, characterized in that the temperature difference between the heater and the contact plane point of the test and a reference body located at a distance of more than four radii of the heater from the center of the heater and not more than the smallest thickness of the test body, until this separation the temperature does not become lower than the predetermined value, the constant power is continuously supplied to the heater, the temperature difference is measured at regular intervals, at each i-th measurement step, the value of the dynamic parameter is determined
where b 1i is determined according to the formulas
where T * j is the temperature difference at the j measurement step, Δτ is the time interval through which measurements are made, k is a positive integer greater than 3, b 1max is the maximum value in absolute value of all b 1i , the value of the dynamic parameter is compared with the previously set value , the tests are completed when the controlled dynamic parameter exceeds the set value, the thermal activity of the material under study is determined based on the laws of heat distribution in flat and spherical half-spaces
Where are the constants determined by the structural and operational parameters of the device that implements the method, d 1 , b 0 , b 1 are the coefficients directly determined from the time dependence of the temperature difference between the heater and the contact plane of the sample and the reference body, then calculate the value then, at δε ≅ 0.1, the thermal activity and thermal conductivity of the studied material are calculated using the formulas
where B 2 , λ ′ are constants determined by structural and operational parameters of the device used that implements the method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU99103718/28A RU2167412C2 (en) | 1999-02-22 | 1999-02-22 | Method of complex determination of thermophysical properties of materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU99103718/28A RU2167412C2 (en) | 1999-02-22 | 1999-02-22 | Method of complex determination of thermophysical properties of materials |
Publications (2)
Publication Number | Publication Date |
---|---|
RU99103718A true RU99103718A (en) | 2000-11-27 |
RU2167412C2 RU2167412C2 (en) | 2001-05-20 |
Family
ID=20216330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
RU99103718/28A RU2167412C2 (en) | 1999-02-22 | 1999-02-22 | Method of complex determination of thermophysical properties of materials |
Country Status (1)
Country | Link |
---|---|
RU (1) | RU2167412C2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CZ301152B6 (en) * | 2007-12-28 | 2009-11-18 | Ceské vysoké ucení technické v Praze | Method, device and test specimen for dynamic testing of building material thermal properties |
RU2493558C1 (en) * | 2012-04-10 | 2013-09-20 | Нина Филипповна Майникова | Method of non-destructive determining temperature characteristics of structural transitions in polymeric materials |
-
1999
- 1999-02-22 RU RU99103718/28A patent/RU2167412C2/en active
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