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

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

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Hydraulics and Fluid Mechanics in ME
Surface tension

Is also known as capillarity
Decreases with fall in temperature
Is a function of the curvature of the interface
Acts in the plane of the interface normal to any line in the surface

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Hydraulics and Fluid Mechanics in ME
If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be

unpredictable
from reservoir C to reservoirs A and B
from reservoir B to reservoirs C and A
from reservoir A to reservoirs B and C

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