A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is_________________?
Correct answer: B. 11.77 kPa
- A. 25.61 kPa
- B. 11.77 kPa
- C. 14.86 kPa
- D. 21.13 kPa
Explanation
At incipient fluidisation, the pressure drop balances the submerged bed weight: ΔP = (1 − ε)ρs gL. Substitution gives 0.4 × 2000 × 9.81 × 1.5 = 11.77 kPa.
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