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4, the vorticities on the wall (j = J0, r = R - (1/2)[DELTA]r [approximately equal to] R) are fixed and rotating but are not moving downstream.
It is clear that the wall shear or the axial component of the curl of vorticities on the wall is one of the wall effects.
2) The period during which NWS acts on the flow passing along vorticities at (i, J0) and (i + 1, J0) is considered.