Hydraulics and Fluid Mechanics in ME
An orifice is said to be large, if

The available head of liquid is more than 5 times the height of orifice
The size of orifice is large
The velocity of flow is large
The available head of liquid is less than 5 times the height of orifice

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

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

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