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_________________?
A. 11.77 kPa
B. 21.13 kPa
C. 25.61 kPa
D. 14.86 kPa
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