Abstract
This paper presents an analytical study of creeping motion of a permeable sphere in a spherical container filled with a micro-polar fluid. The drag experienced by the permeable sphere when it passes through the center of the spherical container is studied. Stream function solutions for the flow fields are obtained in terms of modified Bessel functions and Gegenbauer functions. The pressure fields, the micro-rotation components, the drag experienced by a permeable sphere, the wall correction factor, and the flow rate through the permeable surface are obtained for the frictionless impermeable spherical container and the zero shear stress at the impermeable spherical container. Variations of the drag force and the wall correction factor with respect to different fluid parameters are studied. It is observed that the drag force, the wall correction factor, and the flow rate are greater for the frictionless impermeable spherical container than the zero shear stress at the impermeable spherical container. Several cases of interest are deduced from the present analysis.
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Abbreviations
- a :
-
radius of inner sphere
- b :
-
radius of outer sphere
- μ :
-
dynamic viscosity
- κ :
-
vertex viscosity
- ω :
-
microrotation vector
- α, β, γ:
-
gyro viscosity coefficient
- p :
-
pressure
- υ θ :
-
micro-rotation component
- ψ :
-
stream function
- D :
-
drag force
- W :
-
wall correction factor
- Q :
-
flow rate
- Kn-1/2(λr), In-1/2(λr):
-
modified Bessel functions
- G n (ζ), H n (ζ):
-
Gegenbauer functions
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Mishra, V., Gupta, B.R. Motion of a permeable shell in a spherical container filled with non-Newtonian fluid. Appl. Math. Mech.-Engl. Ed. 38, 1697–1708 (2017). https://doi.org/10.1007/s10483-017-2287-8
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DOI: https://doi.org/10.1007/s10483-017-2287-8
Keywords
- micro-polar fluid
- permeable sphere
- Darcy law
- stream function
- drag force
- wall correction factor
- spherical container