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The entrance effect of laminar flow over a backward-facing step geometry

✍ Scribed by I. E. Barton

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
178 KB
Volume
25
Category
Article
ISSN
0271-2091

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✦ Synopsis

The study investigates the entrance effect for ¯ow over a backward-facing step by comparing predictions that set the inlet boundary at various locations upstream of the sudden expansion. Differences are most signi®cant in the sudden expansion region. If the geometry has an inlet channel, then shorter reattachment and separation lengths are predicted. Comparisons with experimental data indicate that better agreement is found using a long inlet channel, but only for low Reynolds numbers where the experimental error is less signi®cant. For certain cases, predictions with a high expansion number are perturbed by the entrance effect more than low-expansion-number predictions; however, the effect is localized in the sudden expansion region. Channels with low expansion numbers always experience a greater entrance effect after some distance upstream and downstream of the sudden expansion. The boundary layer growth in the inlet channel was examined using a uniform inlet velocity pro®le.

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