Hydraulics and Fluid Mechanics in ME
The fluid forces considered in the Navier Stokes equation are

gravity, viscous and turbulent
pressure, viscous and turbulent
gravity, pressure and viscous
gravity, pressure and turbulent

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Hydraulics and Fluid Mechanics in ME
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be

2A × √H₂/Cd × a × √(2g)
2A × (√H₁ - √H₂)/Cd × a × √(2g)
2A × √H₁/Cd × a × √(2g)
2A × (√H3/2 - √H3/2)/Cd × a × √(2g)

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