Abstract
Particle image velocimetry measurements are performed in
a channel with periodic ribs on one wall. We investigate the flow
around two different rib configurations: solid and perforated ribs
with a slit. The ribs obstruct the channel by 20% of its height
and are arranged 10 rib heights apart. For the perforated ribs,
the slit height is 20% of the rib height, and the open-area ratio
is 16%. We discuss the flow in terms of mean velocity, streamlines,
vorticity, turbulence intensity, and Reynolds shear stress.
We find that the recirculation bubbles after the perforated ribs
are significantly smaller than those after the solid ribs. The reattachment
length after perforated ribs is smaller by about 45%
compared with the solid ribs. In addition, the Reynolds shear
stresses around the perforated ribs are significantly smaller than
in the solid rib case, leading to a reduction of the pressure loss
in the perforated rib case.
a channel with periodic ribs on one wall. We investigate the flow
around two different rib configurations: solid and perforated ribs
with a slit. The ribs obstruct the channel by 20% of its height
and are arranged 10 rib heights apart. For the perforated ribs,
the slit height is 20% of the rib height, and the open-area ratio
is 16%. We discuss the flow in terms of mean velocity, streamlines,
vorticity, turbulence intensity, and Reynolds shear stress.
We find that the recirculation bubbles after the perforated ribs
are significantly smaller than those after the solid ribs. The reattachment
length after perforated ribs is smaller by about 45%
compared with the solid ribs. In addition, the Reynolds shear
stresses around the perforated ribs are significantly smaller than
in the solid rib case, leading to a reduction of the pressure loss
in the perforated rib case.
| Original language | English |
|---|---|
| Publication status | Published - 2010 |
| Event | Proceedings of 3rd Joint US-European Fluids Engineering Summer Meeting and 8th International Conference on Nanochannels, Microchannels, and Minichannels - Montreal, Quebec, Canada Duration: 2010 Jul 1 → 2010 Aug 5 |
Conference
| Conference | Proceedings of 3rd Joint US-European Fluids Engineering Summer Meeting and 8th International Conference on Nanochannels, Microchannels, and Minichannels |
|---|---|
| Country/Territory | Canada |
| City | Montreal, Quebec |
| Period | 2010/07/01 → 2010/08/05 |
Subject classification (UKÄ)
- Energy Engineering