RU2008102328A - METHOD FOR DETERMINING THE COMPLEX OF THERMOPHYSICAL PROPERTIES OF SOLID MATERIALS - Google Patents
METHOD FOR DETERMINING THE COMPLEX OF THERMOPHYSICAL PROPERTIES OF SOLID MATERIALS Download PDFInfo
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- RU2008102328A RU2008102328A RU2008102328/28A RU2008102328A RU2008102328A RU 2008102328 A RU2008102328 A RU 2008102328A RU 2008102328/28 A RU2008102328/28 A RU 2008102328/28A RU 2008102328 A RU2008102328 A RU 2008102328A RU 2008102328 A RU2008102328 A RU 2008102328A
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Abstract
Способ определения комплекса теплофизических свойств твердых материалов, включающий тепловое импульсное воздействие на плоскую поверхность исследуемого образца, измерение избыточной температуры на плоской поверхности образца с момента подачи теплового импульса в одной точке в заданном интервале времени, отличающийся тем, что тепловое импульсное воздействие на плоскую поверхность образца осуществляют лучистым тепловым потоком известной плотности и длительности, а измерение избыточной температуры с момента подачи теплового импульса проводят в центральной части нагреваемой поверхности образца, при этом регистрируют значение максимальной избыточной температуры и время ее достижения, используя математическую модель прямой задачи теплопроводности на основе метода конечных разностей, применяют промежуточную сеточную функцию источника нагрева излучением и конвективного теплообмена: ! , при τ≤τ*; ! , при τ>τ*; ! при , ; ! сеточную функцию, учитывающую теплоперенос по всему объему образца: ! , ! при , , ; ! для учета нелинейной зависимости теплофизических свойств материала от температуры используют кусочно-линейные функции: ! ! ! решают обратную коэффициентную задачу теплопроводности вариационным методом на интервале наблюдения избыточной температуры [τ1,τ2] при выборе параметра регуляризации по невязке: ! , ! искомые теплофизические свойства а, λ находят из минимума функции , ! где - сеточная функция; ! T - избыточная температура, регистрируемая в эксперименте; ! - избыточная температура, рассчитанная математической моделью; ! Тmах - максимальное значение избыточной температуры, регистрируемое в эксперименте; ! max - мA method for determining the complex of thermophysical properties of solid materials, including thermal impulse action on a flat surface of a test sample, measuring excess temperature on a flat surface of a sample from the moment a heat pulse is applied at one point in a predetermined time interval, characterized in that the thermal impulse action on a flat surface of the sample is carried out radiant heat flux of known density and duration, and measurement of excess temperature from the moment of heat pulse They are carried out in the central part of the heated surface of the sample, and the maximum excess temperature and the time of its achievement are recorded using the mathematical model of the direct heat conduction problem based on the finite difference method, the intermediate grid function of the radiation heating source and convective heat transfer is used:! , at τ≤τ *; ! , for τ> τ *; ! at,; ! grid function taking into account heat transfer over the entire volume of the sample:! ! at,,; ! To take into account the nonlinear dependence of the thermophysical properties of the material on temperature, piecewise linear functions are used:! ! ! solve the inverse coefficient problem of thermal conductivity by the variational method on the observation interval of excess temperature [τ1, τ2] when choosing the regularization parameter for the residual:! ! the required thermophysical properties a, λ are found from the minimum of the function,! where is the grid function; ! T is the excess temperature recorded in the experiment; ! - excess temperature calculated by a mathematical model; ! Tmax is the maximum value of the excess temperature recorded in the experiment; ! max - m
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RU2008102328/28A RU2374631C2 (en) | 2008-01-21 | 2008-01-21 | Method of determining system of thermophysical properties of solid materials |
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RU2008102328/28A RU2374631C2 (en) | 2008-01-21 | 2008-01-21 | Method of determining system of thermophysical properties of solid materials |
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Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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RU2534429C1 (en) * | 2013-06-13 | 2014-11-27 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тамбовский государственный технический университет" ФГБОУ ВПО "ТГТУ" | Measurement method of thermal and physical properties of solid materials by method of instantaneous flat heat source |
RU2601234C1 (en) * | 2015-07-13 | 2016-10-27 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тамбовский государственный технический университет" ФГБОУ ВПО "ТГТУ" | Method of measuring thermophysical properties of heat-insulating materials by flat pulse heat source |
RU2613194C1 (en) * | 2015-11-02 | 2017-03-15 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тамбовский государственный технический университет" (ФГБОУ ВО "ТГТУ") | Method of measuring thermal properties of anisotropic materials by linear impulse of heat source |
RU2611080C1 (en) * | 2016-01-22 | 2017-02-21 | Роман Владимирович Мироненко | Apparatus for determining critical value of radiant heat flux for different materials and substances |
CN105675646B (en) * | 2016-03-23 | 2018-04-24 | 哈尔滨工业大学 | High temperature translucent medium thermal conductivity and the method for absorption coefficient are measured based on intrinsic light and heat information at the same time |
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