A model for evaluation of effective thermal conductivity of periodic composites with poorly conducting interfaces
AUTOR(ES)
Escarpini Filho, Romildo dos Santos, Marques, Severino Pereira Cavalcanti
FONTE
Mat. Res.
DATA DE PUBLICAÇÃO
11/11/2014
RESUMO
This paper presents a new micromechanical extension of the parametric finite-volume theory for evaluation of effective thermal conductivities of periodic unidirectional fiber reinforced composites. Such materials are assumed as composed of repeating unit cells with arbitrary internal architectural arrangements of fiber coated by thin interphase with low thermal conductivity. The parametric homogenization approach uses quadrilateral subvolumes for discretization of the repeating unit cell microstructure, thereby allowing an efficient modeling of the details of fibers with arbitrarily shaped cross sections. The interphases are replaced by imperfect interface elements with continuity in normal heat flux and discontinuity in temperature. The performance of the homogenization model is demonstrated for several numerical examples, including two-and three-phase composites with regular squared and hexagonal arrays of fibers. The ability of the model to accurately predict the effective thermal conductivity of those composites is demonstrated by means of comparisons of results obtained using finite-element and analytical solutions.
Documentos Relacionados
- Superhydrophobic Copper Foam Supported Phase Change Composites with High Thermal Conductivity for Energy Storage
- Estimation of effective thermal conductivity enhancement using foam in heat exchangers based on a new analytical model
- Synthesis and characterization of conducting composites of polyaniline and carbon black with high thermal stability
- Analysis of effective thermal conductivity for mineral cast material structures with varying epoxy content using TPS method
- Electrical conductivity and thermal properties of functionalized carbon nanotubes/polyurethane composites