Project ForgeFluid Mechanics
Mechanical Operations
GATE 2015
Medium
A cylindrical packed bed (height 1m, nonporous spherical particles, ρp=1500 kg/m³, void fraction 0.45) is fluidized with air (ρ=1 kg/m³, g=9.8 m/s²). The pressure drop (Pa) at incipient fluidization, rounded to 1 decimal place, is
8080 Pa(± 20 accepted)
Explanation
ΔP=(1−ε)(ρp−ρf)gL=(1−0.45)(1500−1)(9.8)(1)=0.55×1499×9.8=8079.6 Pa.
Source: GATE CH 2015 (2015)
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