Category: Fluid Mechanics for Chemical

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 V2 OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is_________________?

Fluid Mechanics for Chemical 27/08/2021
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A. 12 mm/s
B. 16 mm/s
C. 24 mm/s
D. 28 mm/s

Pick out the correct statement?

Fluid Mechanics for Chemical 24/08/2021
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A. Fanning friction factor is inversely proportional to Reynolds number always
B. The property of a randomly packed bed (with raschig rings) is given by the ratio of the total
volume to the volume of voids in the bed
C. Mach number in an incompressible fluid is always unity
D. Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under
conditions of flow

Select the correct statement?

Fluid Mechanics for Chemical 18/08/2021
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A. The discharge through a Venturimeter depends upon Δp only and is independent of
orientation of the meter
B. A Venturimeter with a given gage difference discharges at a greater rate, when the flow is
vertically downward through it, than when the flow is vertically upward
C. For a given pressure difference, the discharge of gas is greater through a Venturimeter, when
compressibility is taken into account, than when it is neglected
D. The overall pressure loss is the same in a given pipe line, whether a Venturimeter or a nozzle
with the same throat dia is used