The thermal instability of a couple-stress fluid acted upon by uniform vertical rotation and heated from below in a porous medium is investigated. Following the linearized stability theory and normal mode analysis, the paper through mathematical analysis of the governing equations of couple-stress fluid convection with a uniform vertical rotation in porous medium, for the case of rigid boundaries shows that the complex growth rate � of oscillatory perturbations, neutral or unstable for all wave numbers, must lie inside a semi-circle 2
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Banyal et al. (2012) studied this question.
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