Two-dimensional numerical simulation study of the effective thermal conductivity statistics for binary composite materials

Zaginaylo, I.; Maksimeniuk, Yakov; Pysarenko, A.

doi:10.18280/ijht.350219

Cited by 3 publications

(2 citation statements)

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“…4 -5 являются нелинейными. В работе [12] мы показали, что концентрационные зависимости эффективной теплопроводности КМ с моноразмерными включениями удовлетворительно описываются функцией…”

Section: актуальность работыunclassified

Numerical Simulation of Heat Transfer Processes in Composites With Multi-Size Inclusions

Zaginaylo¹,

Pysarenko²,

Spiridonov³

et al. 2019

Visnyk KrNU

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Методом численного эксперимента исследована зависимость эффективной теплопроводности в двумерных моделях двухкомпонентных композиционных материалов от статистико-геометрических параметров моно-и полиразмерных теплоизолирующих включений. Обнаружено, что концентрационные и дистанционные зависимости эффективной теплопроводности материалов с полиразмерными включениями при отсутствии непосредственного теплового контакта между ними совпадают с аналогичными зависимостями для материалов с моноразмерными включениями при условии равенства среднего значения нормально-распределенного размера полиразмерных включений с размерами моноразмерных включений в исследованном диапазоне их статистико-геометрических параметров. Показано, что в предложенных аппроксимациях для зависимостей эффективной теплопроводности от концентрации включений и минимальной дистанции между ними подгоночные коэффициенты являются функциями только какого-либо одного статистико-геометрического параметра включений, что делает данные аппроксимации удобными для практического анализа теплопроводящих свойств материала. Сделан вывод о допустимости использования приближения моноразмерных включений при моделировании процессов переноса в двухкомпонентном композите с дисперсным наполнителем в исследованном диапазоне коэффициентов вариации размеров включений. Ключевые слова: математическое моделирование, композиционный материал, эффективная теплопроводность.

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Section: актуальность работыunclassified

Numerical Simulation of Heat Transfer Processes in Composites With Multi-Size Inclusions

Zaginaylo¹,

Pysarenko²,

Spiridonov³

et al. 2019

Visnyk KrNU

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“…The thermal imaging camera is an instrument that detects the radiated energy and determines the superficial thermal distribution, generating images, thermograms, false-colour or black and white, where the nuance of color or grey scale are related to the distribution temperature of the objects examined, allowing to measure the absolute temperature value of each point (pixel) of the image. (Zaginaylo et al, 2017) As greater is the geometric resolution of the image, i.e. the number of pixels contained, as greater will be the detail and the precision with which is possible to read the temperature since the radiometric cameras are able to measure it for each pixel detected (Bolognesi et al, 2014).…”

Section: Thermal Imaging Cameramentioning

confidence: 99%

3D Modeling by thermography for nondestructive analysis of archaeological heritage

Barrile¹,

Potia²

2018

isi

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Nowadays, the law define as "cultural heritage" a big amount of artifacts. It is immense and in continuous expansion.The need to know as much as possible about the goods and to maximize its duration while maintaining its integrity and its accessibility to the public, has led to the search for increasingly effective solutions to fulfill the purpose. Thermographic analyses are fundamental to determine the insulating and thermo-absorbing capacities of the constituent elements and the position of structural elements not otherwise identifiable to the naked eye. The operation of the Thermographic camera is based on the material's ability to absorb and release heat. The instrument generates maps in different colors that associate a corresponding color with a detected temperature.The present note describes the methodology for the realization of a thermical three-dimensional photogrammetric model, realized with infrared images applied to archaeological assets.The 3D modeling is based on the combined use of imaging techniques as digital photogrammetry and computer vision. RÉSUMÉ. De nos jours, la loi dé finit une grande quantité d'objets artisannaux comme "patrimoine culturel". Cela est immense et en expansion continue.Le besoin de savoir autant que possible sur le bien et de maximiser sa duré e en maintenant son inté grité et son accessibilité au public a conduit à rechercher des solutions de plus en plus efficaces pour atteindre cet objectif.Les analyses thermographiques sont fondamentales pour dé terminer les capacité s isolantes et thermo-absorbantes des é lé ments constitutifs et la position des é lé ments structurels non autrement identifiables à l'oeil nu.Le fonctionnement de la camé ra thermographique est basé sur la capacité des corps à absorber et à libé rer de la chaleur. L'instrument gé nè re des cartes de diffé rentes couleurs qui associent une couleur correspondante à une tempé rature dé tecté e. La pré sente note dé crit la mé thodologie pour la ré alisation d'un modè le photogrammé trique tridimensionnel, ré alisé à l'aide d'images infrarouges appliqué es aux biens arché ologiques.La modé lisation 3D est basé e sur l'utilisation combiné e de techniques d'imagerie comme la photogrammé trie numé rique et la vision par ordinateur.

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Influence of matrix-filler thermal conductivity on micro heat transfer in two-component composites

Pysarenko

Zaginaylo

2021

IOP Conf. Ser.: Mater. Sci. Eng.

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The maps of local heat fluxes in the composite matrix with randomly located heat-insulating and heat-conducting inclusions have been calculated in this work. It was shown that with a significant difference in the thermal conductivity of inclusions and matrix, the main heat transfer occurs through the induced heat-conducting channels. It was found that the weighted average angles of local heat fluxes deviation from the direction of the temperature difference between the sample faces depend on the concentration of heat-insulating and heat-conducting inclusions of various sizes. A sublinear decrease or super linear increase in the effective thermal conductivity of the composite with an increase in the concentration of heat-insulating or heat-conducting inclusions, respectively, was associated with a change in the path length of local heat fluxes due to the flow at an angle to the direction of the temperature difference. An approximation formula for the dependence of the composite effective thermal conductivity on the filler concentration has been proposed, which makes it possible to take into account the presence of both heat-conducting and heat-insulating inclusions.

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Two-dimensional numerical simulation study of the effective thermal conductivity statistics for binary composite materials

Cited by 3 publications

References 0 publications

Numerical Simulation of Heat Transfer Processes in Composites With Multi-Size Inclusions

Numerical Simulation of Heat Transfer Processes in Composites With Multi-Size Inclusions

3D Modeling by thermography for nondestructive analysis of archaeological heritage

Influence of matrix-filler thermal conductivity on micro heat transfer in two-component composites

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