An angled plate moving across a trapped liquid

7 An angled plate moving across a trapped liquid 

If a plate of length Z and inlet and outlet heights defined by h = ho(l + hc/l), then the upward lift force, F/ is [5] 

It is easy to show that the thrust force maximises at around k 1.2, and then 

This simple equation gives us the basis of lubrication, where an angled surface is forced away from another with a viscous force generated inside the lubrication layer. 

8 A cylindrical indenter being pressed into a very viscous liquid 

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