Abstract
The present work concerns with the Couette flow of micropolar fluid in rotating annulus region which is filled with the porous medium. The aim of this study is to present the differences in the motion of micropolar fluid under two different sets of boundary conditions i.e. spin and no-spin condition. An analytical approach has been used to obtain the solution for the linear velocity, microrotational velocity, shear stress and couple stress of the micropolar fluid flowing through annulus porous region. The significance of this work is that the use of two sets of boundary condition greatly impacts the motion of the fluid inside the porous annulus region. The main conclusion withdrawn from the present work is that under the spin condition, the velocity profile achieve lower values as compared to the velocity profile under the no-spin condition. The reverse result has been found for the microrotational velocity of the micropolar fluid. The obtained results can be used in various industrial and engineering applications. The present work is validated with the previously published work.
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Abbreviations
- I,:
-
Moment of inertia/mass
- \(\mu\),:
-
Shear viscosity
- \(\vec {v}\),:
-
Linear velocity vector
- \(\vec {\omega }\),:
-
Micro-rotational velocity vector
- \(\rho \vec {F}\), \(\rho \vec {g}\),:
-
External force and moment force
- \(\rho\),:
-
Density of the fluid
- p,:
-
pressure
- \(\kappa\),:
-
Vortex viscosity
- \(\alpha\), \(\beta\) :
-
Bulk spin viscosity
- k,:
-
Permeability
- \(r_{1}\), \(r_{2}\),:
-
Radii of inner and outer cylinders, respectively
- \(\Omega _{1}\), \(\Omega _{2}\),:
-
Angular velocity of inner and outer cylinders respectively
- n,:
-
permeability parameter
- \(v^{*}\), \(r^{*}\), \(\omega ^{*}\),:
-
Dimensionless variables
- \(\xi\),:
-
Material parameter
- \(\tau _{ij}\),:
-
Shear stress tensor
- \(C_{ij}\),:
-
couple stress tensor
- \(\lambda\),:
-
Radii ratio
- m,:
-
Angular velocity ratio
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Acknowledgements
The first author gratefully acknowledges the financial support provided by the Council of Scientific and Industrial Research CSIR, India under file no. 09/1032(0021)/2020-EMR-I.
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Jaiswal, S., Yadav, P.K. Analysis on Couette flow of a micropolar fluid through a circular annulus filled with the porous medium. Microfluid Nanofluid 26, 100 (2022). https://doi.org/10.1007/s10404-022-02601-8
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DOI: https://doi.org/10.1007/s10404-022-02601-8