Fluid Mechanics
The equation given below is called the __________ . f-0.5 = 4.07 loge (NRe√f)-0.6

Von-Karman equation
Fanning equation
None of these
Colebrook formula

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Fluid Mechanics
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 x 10³ VOM + 10.94 x 10⁶ V²OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is

16 mm/s
28 mm/s
12 mm/s
24 mm/s

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Fluid Mechanics
Steady flow occurs, when the

Conditions are the same at the adjacent points at any instant
Conditions change steadily with time
Conditions do not change with time at any point
Rate of the velocity change is constant

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