Project ForgeFluid Mechanics
Mechanical Operations
GATE 2020
Medium
A vertically-held packed bed (height 1m, void fraction 0.1, no flow) is fluidized by a fluid of density 1 kg/m³. Particle density is 3000 kg/m³ (g=9.81 m/s²). The pressure drop (Pa) across the bed at incipient fluidization is (round off to nearest integer)
26478 Pa(± 30 accepted)
Explanation
At incipient fluidization, ΔP=(1−ε)(ρp−ρf)gL=(1−0.1)(3000−1)(9.81)(1)=0.9×2999×9.81=26,478 Pa.
Source: GATE CH 2020 (2020)
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