Abstract
Using three diameter ratios, and up to four inlet velocity profiles, the laminar flow in axisymmetric sudden expansions is investigated numerically. For inlet Reynolds numbers of 250 or lower, the vortex reattachment length is found to be a linear function of the Reynolds number regardless of either the diameter ratio or inlet velocity profile; however, the inlet velocity profile plays an important role in contributing to a non-linear relationship between the vortex length as a function of the expansion step height. The wall shear-stress distribution in the larger pipe is found to depend strongly upon the diameter ratio, inlet velocity profile and Reynolds number.
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