The use of additional degrees of freedom to explain the behaviour of micropolar systems, namely, spin, microinertia, antisymmetric pressure tensor and spin flux, makes the problem of choosing boundary conditions more acute. For micropolar fluids in contact with a wall, diverse intuitive boundary conditions have been proposed by several authors1–3. Some of these boundary conditions are incompatible and others cannot be applied to any micropolar fluid. In our opinion the difficulty lies in the fact that intuitive arguments are not sufficient to understand the behaviour of micropolar fluids near a boundary and therefore it is necessary to make use of another type of approach.
KeywordsEntropy Production Micropolar Fluid Pressure Tensor Intuitive Argument Phenomenological Coefficient
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