Hydraulics and Fluid Mechanics in ME
Principle of similitude forms the basis of

comparing two identical equipments
designing models so that the result can be converted to prototypes
hydraulic designs
comparing similarity between design and actual equipment

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Hydraulics and Fluid Mechanics in ME
Coefficient of resistance is the ratio of

Actual velocity of jet at vena-contracta to the theoretical velocity
Area of jet at vena-contracta to the area of orifice
Actual discharge through an orifice to the theoretical discharge
Loss of head in the orifice to the head of water available at the exit of the orifice

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