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Open AccessArticle

Micromagnetorotation of MHD Micropolar Flows

Department of Mechanical Engineering, University of West Attica, 12244 Athens, Greece
Institute for Bio-Economy and Agri-Technology (IBO), Centre for Research & Technology Hellas (CERTH), 38333 Volos, Greece
Fluid Dynamics and Turbomachinery Laboratory, Department of Mechanical Engineering, University of the Peloponnese, 26334 Patras, Greece
Author to whom correspondence should be addressed.
Symmetry 2020, 12(1), 148;
Received: 12 December 2019 / Revised: 8 January 2020 / Accepted: 9 January 2020 / Published: 10 January 2020
(This article belongs to the Special Issue Fluid Mechanics Physical Problems and Symmetry)
The studies dealing with micropolar magnetohydrodynamic (MHD) flows usually ignore the micromagnetorotation (MMR) effect, by assuming that magnetization and magnetic field vectors are parallel. The main objective of the present investigation is to measure the effect of MMR and the possible differences encountered by ignoring it. The MHD planar Couette micropolar flow is solved analytically considering and by ignoring the MMR effect. Subsequently, the influence of MMR on the velocity and microrotation fields as well as skin friction coefficient, is evaluated for various micropolar size and electric effect parameters and Hartmann numbers. It is concluded that depending on the parameters’ combination, as MMR varies, the fluid flow may accelerate, decelerate, or even excite a mixed pattern along the channel height. Thus, the MMR term is a side mechanism, other than the Lorentz force, that transfers or dissipates magnetic energy in the flow direct through microrotation. Acceleration or deceleration of the velocity from 4% to even up to 45% and almost 15% deviation of the skin friction were measured when MMR was considered. The crucial effect of the micromagnetorotation term, which is usually ignored, should be considered for the future design of industrial and bioengineering applications.
Keywords: micropolar fluid; micromagnetorotation effect; couette flow; magnetohydrodynamics micropolar fluid; micromagnetorotation effect; couette flow; magnetohydrodynamics
MDPI and ACS Style

Aslani, K.-E.; Benos, L.; Tzirtzilakis, E.; Sarris, I.E. Micromagnetorotation of MHD Micropolar Flows. Symmetry 2020, 12, 148.

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