Abstract
Pseudoplastic circular Couette flow in annulus is investigated. The flow viscosity is dependent on the shear rate, which directly affects the conservation equations that are solved in the present study by the spectral method in the present study. The pseudoplastic model adopted here is shown to be a suitable representative of nonlinear fluids. Unlike the previous studies, where only the square of shear rate term in the viscosity expression was considered to ease the numerical manipulations, in the present study takes the term containing the quadratic power into account. The curved streamlines of the circular Couette flow can cause a centrifugal instability leading to toroidal vortices, known as Taylor vortices. It is further found that the critical Taylor number becomes lower as the pseudoplastic effect increases. Comparison with existing measurements on pseudoplastic circular Couette flow results in good agreement.
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Recommended by Associate Editor Dongshin Shin
Nariman Ashrafi holds a Ph.D in Mechanical Engineering from University of Western Ontario in Canada. His research interests include non-Newtonian fluid dynamics, stability, rheology. He has so far published more than 20 papers in reputable international journals as well as several conference proceedings. He has held several positions in research and industry e.g. postdoctoral fellowship at the University of Wales (UK), researcher at Shell Research Center (UK), faculty member at Georgia Southern University (USA), University of Natal (South Africa) and Islamic Azad university (Iran).
Habib Karimi Haghighi holds an M.Sc in Mechanical Engineering from Science and Research Branch, IAU, Tehran, Iran. His research interests include nonlinear dynamics, hydrodynamic instability and non-Newtonian flow.
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Khorasani, N.A., Haghighi, H.K. Shear-dependant toroidal vortex flow. J Mech Sci Technol 27, 85–94 (2013). https://doi.org/10.1007/s12206-012-1222-9
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DOI: https://doi.org/10.1007/s12206-012-1222-9