"Consider a fully developed laminar flow in a circular pipe, perform force analysis on an element of the real fluid."(adsbygoogle = window.adsbygoogle || []).push({});

I've just started this type of question, and I'm a bit confused about where to go from here:

I've managed to do a force balance horizontally to show that the partial derivative of pressure with respect to x should be zero (which is obvious anyway?), but I have no idea what to do with the vertical force balance and what the question is really asking me to do.

Thanks in advance!

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# Force Analysis: Circular Pipe

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