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Homogenization of a three-phase composites of double-porosity type. (English) Zbl 07332706
Summary: In this work we consider a diffusion problem in a periodic composite having three phases: matrix, fibers and interphase. The heat conductivities of the medium vary periodically with a period of size \(\varepsilon^\beta\) (\(\varepsilon>0\) and \(\beta>0\)) in the transverse directions of the fibers. In addition, we assume that the conductivity of the interphase material and the anisotropy contrast of the material in the fibers are of the same order \(\varepsilon^2\) (the so-called double-porosity type scaling) while the matrix material has a conductivity of order \(1\). By introducing a partial unfolding operator for anisotropic domains we identify the limit problem. In particular, we prove that the effect of the interphase properties on the homogenized models is captured only when the microstructural length scale is of order \(\varepsilon^\beta\) with \(0<\beta\leq 1\).
MSC:
35B27 Homogenization in context of PDEs; PDEs in media with periodic structure
35B45 A priori estimates in context of PDEs
35K55 Nonlinear parabolic equations
35K65 Degenerate parabolic equations
76S05 Flows in porous media; filtration; seepage
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