Experiments on a steady flow through a nominally 2-D exit geometry with rounded edges are presented for the Reynolds number range 300<Re<25,000. The results indicate that the channel flow expands and decelerates upstream of the exit plane resulting in large pressure recovery, especially for turbulent channel flow. It is shown that pressure recovery is a function of the dimensionless edge radius and Re. Pressure recoveries of up to 20% are reported at large Re for dimensionless radii as small as r/h=0.625. It is also found that the rounded exit results in turbulence levels as much as 25% higher than sharp-edged exits.
Experiments in Fluids – Springer Journals
Published: Mar 25, 2004
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