Which of the following is the correct equation for minimum fluidization velocity for large particles? Here, Dp is the diameter of the particle, ρP and ρF are the density of particle and fluid medium respectively, εmf is the porosity and ΦS is the shape factor.

• A. Umf2 = \(\frac {Dp (ρP-ρF)g}{1.75ρF}\) × εmf3 × ΦS
• B. Umf2 = \(\frac {Dp (ρP-ρF)g}{1.75ρP}\) × εmf3 × ΦS
• C. Umf2 = \(\frac {Dp (ρP-ρF)g}{1.75ρP}\) × εmf2 × ΦS
• D. Umf2 = \(\frac {Dp (ρP-ρF)g}{1.75ρF}\) × εmf2 × ΦS