Hydraulics and Fluid Mechanics in ME
For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is

dependent on relative roughness only
constant
dependent only on Reynolds number
a function of Reynolds number and relative roughness

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Hydraulics and Fluid Mechanics in ME
The specific speed of turbine is defined as the speed of a unit

Of such a size that it requires unit power per unit head
Of such a size that it produces unit horse power with unit head
Of such a size that it delivers unit discharge at unit head
Of such a size that it delivers unit discharge at unit power

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