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Old   December 2, 2010, 19:47
Default Fully developing flow
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As a fluid enters a pipe and progresses further down, does the shear stress at the wall reduce whilst the boundary layer increases and viscous forces take over?

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Old   December 3, 2010, 21:05
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Yes. The shear stress is proportional to the gradient of velocity (in the direction normal to the wall) and since the gradient is larger in the developing region, the shear stress will also be larger here as well.

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