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Drag Reduction Using Polysaccharides in a Taylor–Couette Flow

机译：在Taylor-Couette流中使用多糖进行减阻

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摘要

Three different polysaccharides, aloe vera, Tamarind powder and pineapple fibers, are utilized as drag reducing agents in a turbulent flow. Using a Taylor–Couette setup, consisting of a rotating inner cylinder, for measuring the drag reduction, a range of Reynolds numbers from 4 × 104 to 3 × 105 has been explored in this study. The results are in good agreement with previous studies on polysaccharides conducted in a pipe/channel flow and a maximum drag reduction of 35% has been observed. Further, novel additives such as cellulose nanocrystals (CNC), surfactants and CNC grafted with surfactants are also examined in this study for drag reduction. CNC due to its rigid rod structure reduced the drag by 30%. Surfactant, due to its unique micelle formation showed maximum drag reduction of 80% at low Re. Further, surfactant was grafted on CNC and was examined for drag reduction. However, drag reduction property of surfactant was observed to be significantly reduced after grafting on CNC. The effect of Reynolds number on drag reduction is studied for all the additives investigated in this study.
机译：三种不同的多糖，芦荟，罗望子粉和菠萝纤维，被用作湍流中的减阻剂。使用由旋转内圆柱组成的Taylor–Couette装置来测量减阻，雷诺数范围从4×10 4 到3×10 5 在这项研究中进行了探索。该结果与以前对在管道/通道流中进行多糖的研究非常吻合，并且观察到最大阻力降低了35％。此外，在这项研究中还研究了新型添加剂，例如纤维素纳米晶体（CNC），表面活性剂和表面活性剂接枝的CNC，以减少减阻作用。 CNC由于其刚性杆结构而使阻力降低了30％。表面活性剂，由于其独特的胶束形成，在低Re下显示最大减阻80％。此外，将表面活性剂接枝到CNC上并检查减阻作用。然而，观察到在CNC上接枝后表面活性剂的减阻性能显着降低。研究了本研究中研究的所有添加剂的雷诺数对减阻的影响。

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