Numerical study of effective thermal conductivities of plain woven composites by unit cells of different sizes

•Three unit cells of different sizes for plain woven composites are formulated.•Thermal boundary conditions of each unit cells are derived.•The influences of porosity and fiber volume fraction of composites are analyzed. An FEM (Finite Element Method) numerical approach of predicting the effective t...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2015-12, Vol.91, p.829-840
Main Authors: Gou, Jian-Jun, Dai, Yan-Jun, Li, Shuguang, Tao, Wen-Quan
Format: Article
Language:English
Subjects:
Effective thermal conductivities
Numerical prediction
Plain woven composites
Unit cell
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Summary:•Three unit cells of different sizes for plain woven composites are formulated.•Thermal boundary conditions of each unit cells are derived.•The influences of porosity and fiber volume fraction of composites are analyzed. An FEM (Finite Element Method) numerical approach of predicting the effective thermal conductivities of plain woven composites is presented in this paper. Three reducing-size unit cells are formulated by using different symmetries exhibited in the composite, including translational, reflectional and rotational symmetries. Corresponding thermal boundary conditions are derived and validated by the numerical results of the same problem of different unit cells. Thermal conductivities of the matrix with porosity and the woven yarns are calculated first, and then used as input data to numerically predict the effective thermal conductivities of plain woven composite. The influences of porosity and fiber volume fraction on effective thermal conductivities of studied composites are clarified.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2015.07.074