The effects of couple stresses in fluids on the hydrodynamic stability of plane Poiseuille flow have been considered based on the model for fluids proposed by Stokes. Numerical solutions to the problem have been obtained by using an initial-value technique. It has been shown that the critical Reynolds number first decreases and then increases with the increase in couple stresses. The effects of couple stresses on the different flow parameters, which describe the disturbances, have also been determined.
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Jain et al. (1972) studied this question.
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