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- W2621852457 abstract "In this paper, to study the viscoelastic effect on isotropic turbulence without wall effects, a two oscillating grid turbulence is built to investigate this phenomenon using particle image velocimetry. In the experiments, the classical drag-reducing additives are chosen: polyacrylamide (PAM) and cetyltrimethyl ammonium chloride (CTAC), which have shown remarkable drag-reducing effect in wall-bounded turbulent flows. The results show that the existence of drag-reducing additives makes velocity field more anisotropic and reduces turbulent kinetic energy. We propose an intuitive and natural definition for a reduction rate of turbulent kinetic energy to show viscoelastic effect. It suggests that there exists a critical concentration for the reduction rate of turbulent kinetic energy in the CTAC solution case. Also, the small-scale vortex structures are inhibited, which suggests the drag-reducing mechanism in grid turbulence without wall effect." @default.
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- W2621852457 date "2017-12-01" @default.
- W2621852457 modified "2023-09-25" @default.
- W2621852457 title "Experimental study on two oscillating grid turbulence with viscoelastic fluids based on PIV" @default.
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- W2621852457 doi "https://doi.org/10.1139/cjp-2017-0038" @default.
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