Minimum Fluidisation Velocity MCQ

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• 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.
  ক

  Umf2 = \(\frac {Dp (ρP-ρF)g}{1.75ρF}\) × εmf3 × ΦS

  খ

  Umf2 = \(\frac {Dp (ρP-ρF)g}{1.75ρP}\) × εmf3 × ΦS

  গ

  Umf2 = \(\frac {Dp (ρP-ρF)g}{1.75ρP}\) × εmf2 × ΦS

  ঘ

  Umf2 = \(\frac {Dp (ρP-ρF)g}{1.75ρF}\) × εmf2 × ΦS
• Which of the following is the best condition for minimum fluidization?
  ক

  Drag force imparted by the down flowing gas equals the weight of the particles, and void space in the bed increases slightly

  খ

  Drag force imparted by the upward flowing gas equals the weight of the particles, and void space in the bed increases slightly

  গ

  Drag force imparted by the upward flowing gas equals the weight of the particles, and void space in the bed decreases slightly

  ঘ

  Drag force imparted by the down flowing gas equals the weight of the particles, and void space in the bed decreases slightly