Steady Flow of a Second-Grade Fluid in an Annulus with Porous Walls

Figure 1

The variation of the azimuthal velocity for various values of the cross-Reynolds number and the elastic number. (𝜀=0); (𝜀=1), 𝜁=(𝜉−𝜎)/(1−𝜎); 𝜎≤𝜉≤𝑟/𝑏₁, 𝜎=0.2.