Electrohydrodynamic Instability of Two Thin Viscous Leaky Dielectric Fluid Films in a Porous Medium

Figure 7

Variation of growth rate 𝜔 with wavenumber 𝑘 for various values of 𝜇_𝑟 when 𝜀=0.4, 𝑘₁=3, 𝑆¹⁽⁰⁾=10³, 𝑆²⁽⁰⁾=10⁴, 𝜖₁=3, 𝜖₂=4, 𝛽=0.5, and 𝜇_𝑟=1,2,4, respectively, for the wavenumber ranges (a) 0≤𝑘≤30, and (b) 0≤𝑘≤5.

(a)

(b)