The direction of the tangential force (Fully developed laminar flow in a pipe)

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SUMMARY

The discussion focuses on the direction of the tangential force in fully developed laminar flow within a pipe. It is established that the shear stresses indicated in the relevant diagrams are negative, confirming the expected behavior of fluid dynamics in this scenario. The analysis emphasizes the importance of understanding shear stress values for accurate predictions in fluid mechanics applications.

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  • Knowledge of shear stress calculations
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Minghan
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TL;DR
It's about differential control volume for analysis of fully developed laminar flow in pipe.
Just can't understand why the directions of the tangential forces (shear forces) is like that as the text book show.
I think the directions should be opposite because inner cylindrical surface is carried by central fluid which moves faster and outer cylindrical surface is dragged by the wall.
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The actual directions will be as you say. That means that the values of the shear stresses indicated in the diagram will be negative.
 
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