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I am consideringflow between a rigid cylinder parallel to a rigid horizontal stationary surface. Assuming that we can apply the lubrication limit (so that the cylinder is very close to the surface) I cannot understand why the net fluid force acting on the surface has no component perpendicular to it.

Could someone please help me understand!

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  • $\begingroup$ Is that what your analysis shows? If so, it is wrong. $\endgroup$
    – Chet Miller
    Commented Jun 5, 2020 at 22:25
  • $\begingroup$ It's part of the question! $\endgroup$
    – MathematicianP
    Commented Jun 6, 2020 at 9:45
  • $\begingroup$ why don't you just write down the appropriate lubrication equations for the situation and see how it plays out? $\endgroup$
    – Chet Miller
    Commented Jun 6, 2020 at 11:58

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