Fluid Mechanics
Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will

Decrease
Data insufficient to predict relative pressure drop
Increase
Remain unchanged

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Fluid Mechanics
The Prandtl mixing length is

Independent of the shear stress
Useful for computing laminar flow problems
Independent of radial distance from the pipe axis
Zero at the pipe wall and is a universal constant

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