PIV MEASUREMENTS OF TURBULENT FLOW IN A CHANNEL WITH SOLID OR PERFORATED RIBS

Summary, in English

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.

• Author: Lei Wang; Mirko Salewski; Bengt Sundén
• Department/s: Heat Transfer; Department of Energy Sciences
• Publishing year: 2010
• Language: English
• Document type: Conference paper
• Topic: Energy Engineering
• Conference name: Proceedings of 3rd Joint US-European Fluids Engineering Summer Meeting and 8th International Conference on Nanochannels, Microchannels, and Minichannels
• Conference date: 2010-07-01 - 2010-08-05
• Conference place: Montreal, Quebec, Canada
• Status: Published