Effective thermal conductivity of a misoriented short fiber composite

Hatta, Hiroshi; Taya, Masahito

doi:10.1063/1.335924

Cited by 353 publications

(158 citation statements)

References 14 publications

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“…According to the mean field homogenization theory, 22,32,33 also known as the effective medium theory, both bulk modulus and thermal conductivity of CSH decrease with increasing pore volume fraction, see Fig. 4(b) and supplementary material for details.…”

Section: -mentioning

confidence: 99%

The contribution of propagons and diffusons in heat transport through calcium-silicate-hydrates

Zhou

Morshedifard

Lee

et al. 2017

Applied Physics Letters

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Whether it is glass, ceramics, cement, or concrete, minimizing thermal conduction through disordered materials is a determining factor when it comes to reducing the energy consumption of cities. In this work, we explore underlying physical processes involved in thermal conduction through the disordered glue of cement, calcium-silicate-hydrates (CSH). We find that at 300 K, phonon-like propagating modes in accordance with the Boltzmann transport theory, propagons, account for more than 30% of the total thermal conductivity, while diffusons, described via the Allen-Feldman theory, contribute to the remainder. The cumulative thermal conductivity proves to be close to both equilibrium molecular dynamics calculations and experimental values. These findings help us establish different strategies, such as localization schemes (to weaken diffusons) and scattering mechanisms (to constrain propagons), for reduction of thermal conductivity of CSH without sacrificing its mechanical properties.

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Section: -mentioning

confidence: 99%

The contribution of propagons and diffusons in heat transport through calcium-silicate-hydrates

Zhou

Morshedifard

Lee

et al. 2017

Applied Physics Letters

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“…The predictions by the two models would be in relatively good agreement with the experimental results for f of 0.3 or smaller. However, the present model would predict better than MEM by applying the result by Hatta and Taya 9) for f of 0.4 or higher. It can be reached from the parametric studies and Fig.…”

Section: )mentioning

confidence: 58%

“…1,2) On the other hand, MEM, the original Eshelby model combined with Mori-Tanaka's mean field approach, has been widely employed for predicting the thermo-mechanical properties of composites reinforced with various shapes of fillers. [3][4][5][6][7][8][9] Hatta and Taya derived the thermal conductivity of a composite with short fibers using both MEM and the analogy between the elasticity and the steady-state heat conduction. 7) It has been applied to composites with various shapes of fillers and widely used due to its simplicity of a computation.…”

Section: Introductionmentioning

confidence: 99%

Generalized Self-Consistent Model for Predicting Thermal Conductivity of Composites with Aligned Short Fibers

Lee

Kim

2010

Mater. Trans.

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Thermal conductivities of aligned short fiber composites in the longitudinal and transverse directions are derived by extending the generalized self-consistent model proposed by Benveniste and Miloh. Their final forms are semi-explicitly expressed as functions of constituents' thermal conductivities, fiber aspect ratio, and the aspect ratio of the matrix surrounding the fiber. The results are proved to be consistent with those of composites with extreme shapes of fillers such as sphere and continuous fiber by simply changing a confocality variable. The present results for aligned short fiber composites are compared with Wu's upper and lower bounds to be validated. Finally, the predictions by the present model and modified Eshelby model are compared in terms of the thermal conductivity ratio of constituents, fiber aspect ratio, and fiber volume fraction and their accuracy for the predictions are evaluated by the experimental results from the literature.

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“…The calculated effective thermal conductivities with FEM method were compared with those obtained with equivalent inclusion method 1) using programs developed in our previous work.…”

Section: Comparison To Analytical Solutionmentioning

confidence: 99%

“…Analytical methods such as the law of mixture and equivalent inclusion method 1) are commonly used to evaluate the effective thermal conductivity of these materials. However, these analytical solutions were always deduced with some simplification and limitation on component material's property and structure of the composite, for example almost all analytical solutions assume that the thermal conductivities of matrix and dispersion are both isotropic, therefore they can not be applied to anisotropic fiber-for example carbon fiber, or anisotropic particle-reinforced composites.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the Thermal Conductivity of Randomly Dispersed Composites using a Finite Element Modeling Method

Yagi

2004

Mater. Trans.

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A new method to generate 3 dimensional finite element method (FEM) models of composites with random materials arrangement has been proposed. Some basic models are used to represent the structure of the composites, in each basic model, the dispersions are assumed to have the same geometry, and the structure of a basic model can be described by some structural parameters such as the geometry, number and volume fraction of the dispersion and so on. A program has been developed to automatically generate the geometric model and FEM mesh of the basic models according to given structure parameters. More complicated composite structure can be composed by combination of the basic models. The effective thermal conductivity of composite has been calculated based on the models generated with this method. Optimization of modeling parameters such as model scale and mesh refinement has been discussed with consideration of both calculation accuracy and computation efficiency. The calculated thermal conductivity has been compared to the values obtained by analytical method.

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Effective thermal conductivity of a misoriented short fiber composite

Cited by 353 publications

References 14 publications

The contribution of propagons and diffusons in heat transport through calcium-silicate-hydrates

The contribution of propagons and diffusons in heat transport through calcium-silicate-hydrates

Generalized Self-Consistent Model for Predicting Thermal Conductivity of Composites with Aligned Short Fibers

Calculation of the Thermal Conductivity of Randomly Dispersed Composites using a Finite Element Modeling Method

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