A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidised by water (density 1000 kg/m3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is________________?
Correct answer: A. 4.4 KPa
- A. 4.4 KPa
- B. 2.94 KPa
- C. 3.7 KPa
- D. None of these
Explanation
At incipient fluidisation, the pressure drop balances the effective weight of the particles: ΔP = (ρs − ρf)(1 − ε)Lg. Substitution gives about 4.4 kPa, matching option a.
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