Summary
A variational principle for incompressible Reiner-Rivlin fluids proposed by Bird has been applied to creeping flow past a sphere of a fluid with constant coefficients of viscosity η and normal-stressη c . The drag coefficientf is found to be given byf = C/Re, whereC =C(η c v ∞/ηR). Available data in the literature for (apparently) Newtonian fluids show no indication of a non-zero normal-stress coefficient.
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Abbreviations
- A, B, D, K s ,G p :
-
constants in general trial function for stream function (23)
- C :
-
function ofRn defined by (28)
- d ij :
-
rate-of-deformation tensor defined by (2)
- E, F, G :
-
constants in trial function for stream function (26)
- f :
-
friction factor defined by (13)
- F d :
-
drag force which fluid exerts on sphere in the positive z direction
- J :
-
variational functional defined by (8)
- p :
-
pressure
- r :
-
spherical coordinate
- R :
-
radius of sphere
- Re :
-
dimensionless Reynolds number defined as (2Rv ∞ρ/η).
- Rn :
-
dimensionless group defined as (η c v ∞/ηR)
- t ij :
-
stress tensor
- v i :
-
velocity vector
- v τ v θ :
-
physical components of the velocity vector in ther and0 directions
- v z :
-
hysical component of the velocity vector in the positivez direction
- v ∞ :
-
magnitude of vz at a large distance from the sphere
- V :
-
used to indicate integration over the volume of the system as in (8)
- x :
-
dimensionless radiusr/R
- z :
-
rectangular coordinate
- β:
-
spherical coordinate defined as π/2 — θ
- δ i i :
-
Kronecker delta = 0(i ≠j) = 1(i =j)
- η,η c :
-
functions of II, III defined by (3)
- η0,η1:
-
constants defined by (6)
- θ, ϕ:
-
spherical coordinates
- ρ:
-
density
- τ ij :
-
viscous portion of the stress tensor
- ψ:
-
stream function defined by (16)
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Based on M. S. thesis of Robert D. Foster
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Foster, R.D., Slattery, J.C. Creeping flow past a sphere of a Reiner-Rivlin fluid. Appl. sci. Res. 12, 213–222 (1963). https://doi.org/10.1007/BF03184973
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DOI: https://doi.org/10.1007/BF03184973