Shear stress and drag force on an immersed plate

1 Shear stress and drag force on an immersed plate 

The shear stress in the fluid adjacent to the plate (y = 0) is given by equation (7.28a), i.e. 

The shear stress acting on the plate will be equal and opposite of this value, 

The average shear stress acting over the entire plate may be calculated as  

Introducing a drag coefficient Co, as defined earlier, equation (7.32) can be re-written as  

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