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ISSN Print: 1065-3090
ISSN Online: 1940-4336
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EFFECT OF TRIANGULAR MICROGROOVES ON DRAG REDUCTION IN RECTANGULAR PIPE FLOW
ABSTRACT
It has been known for decades that turbulent flow may benefit greatly from drag reduction provided by microgrooves. The original inspiration came from mimicking the surface microstructures of the skin of fast swimming sharks. For the great potential benefit of application in long-distance pipeline transportation of oil or tap water, streamwise-aligned microgrooves are used in a rectangular pipe flow in this study. A detailed experimental system is discussed and the microgroove geometries are defined. Pressure drop collected using different h/s ratio microgrooves of microgrooved surfaces fabricated for the flow cell is provided and the drag reduction rate is analyzed and compared to the results of previous researches. To explore the mechanism of drag reduction of microgrooves, a visualization test by a particle image velocimetry (PIV) is conducted, and the detailed flow field, including the instantaneous mean velocity, Reynolds shear stress, turbulent intensities, and the vorticity is presented and discussed. Moreover, the drag reduction mechanism of microgrooves is proposed and discussed.
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