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What is the correct expression for pressure drop in a fluidised bed at fluidisation?

Correct Answer: ΔP=(1-∈)(ρP-ρg)gHB
At fluidisation, the pressure drop equals the weight of the particles, which is its weight per unit area of cross section of bed which is (ρP-ρg)gHC. The term ∈ here stands for the porosity of the bed.

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

Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m3, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is

After fluidisation, the pressure drop in the fluid phase across the bed is _______ to the bed weight over unit surface of the bed cross section.

The pressure drop in fluidised bed on fluidisation __________ with increasing flow rate.

In a Fluidised Bed Heat Exchanger with hot gas flow, at fluidisation the temperature of the bed is ________

A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below:
Δ P/L = 375 × 103 VOM + 10.94 × 106 V2OM (SI units)
If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed?

If the operation on a fluidised bed is a dense flowing fixed bed, then which one of the following method is used for pressure drop calculation?

Pressure drop in a fluidised bed reactor is __________ that in a similar packed bed reactor.

The gas phase fluidised bed is commonly known as ______________ because of its top surface fluidisation.

Parameters that describe the overall behaviour of the fluidized bed in the bubbling regime are: (i) minimum fluidization velocity, (ii) Pressure drop across the bed, (iii) Bed height increase, (iv) Particle elutriation.