Fluid Mechanics
Euler's equation of motion is a statement expressing

Newton's first law of motion
Newton's second law of motion
Conservation of mass
Conservation of energy

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Fluid Mechanics
Shear stress in a fluid flowing in a round pipe

Varies parabolically across the cross-section
Remains constant over the cross-section
Is zero at the centre and varies linearly with the radius
Is zero at the wall and increases linearly to the centre

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Fluid Mechanics
The Prandtl mixing length is

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

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Fluid Mechanics
Steady flow occurs, when the

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

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