Hydraulics and Fluid Mechanics in ME
When an ideal fluid flows past a sphere

lowest pressure intensity occurs at rear stagnation point
total drag is zero
highest intensity of pressure occurs around the circumference at right angles to flow
lowest pressure intensity occurs at front stagnation point

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Hydraulics and Fluid Mechanics in ME
Overall efficiency of a centrifugal pump is the ratio of

Energy supplied to the pump to the energy available at the impeller
Manometric head to the energy supplied by the impeller per kN of water
Energy available at the impeller to the energy supplied to the pump by the prime mover
Actual work-done by the pump to the energy supplied to the pump by the prime mover

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