Upstream and downstream influence of pipe curvature on the flow through a bend
1987; Elsevier BV; Volume: 8; Issue: 3 Linguagem: Inglês
10.1016/0142-727x(87)90030-0
ISSN1879-2278
AutoresJohn A. Fairbank, R. M. C. So,
Tópico(s)Fluid Dynamics and Vibration Analysis
ResumoAbstract Experiments were carried out to determine the upstream and downstream influence of a 180° pipe bend on the flow through the bend. A laser Doppler anemometer was used to measure the axial velocity at various locations before and after the bend. Two bends, of radius ratios 0.08 and 0.30, were studied at a Reynolds number of about 400, corresponding to Dean numbers of 110 and 220, respectively. Results indicate that the bend influence extended to one diameter upstream for a Dean number of 220, but no upstream influence was observed for a Dean number of 110. The corresponding downstream influence of the bend was 14 and 11 diameters, respectively. These results compare well to a recent analysis on entry flow into a pipe bend.
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