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- W4286565893 abstract "Although having been increasingly studied, there is still controversy as to when the addition of nanoparticles could improve the drag reduction performance of polymer drag reducer and particularly what is the underlying mechanism from the fluid dynamics viewpoint. The drag reduction effects of adding SiO2 nanoparticles to various polymer polyacrylamide (PAM) solutions were examined in this work. The optimal combination of SiO2 nanoparticles with cationic polyacrylamide was confirmed. Interestingly, the addition of SiO2 nanoparticles to cationic polyacrylamide solution was shown to be quite efficient for reducing drag, but only at higher flow rates with Reynolds numbers more than 6000, below which the nanoparticle addition is even negative. The addition of SiO2 nanoparticles to the PAM solution is supposed to play a dual role. The first is an increase in flow resistance caused by the Brownian motion of nanoparticles, while the second is a decrease in flow resistance caused by acting as nodes to protect the polymer chain from shear-induced breaking under high shear action. At optimal nanoparticle concentration and under higher Reynolds numbers, the later effect is dominant, which could improve the drag reduction performance of polymer drag reducers. Our work should serve as a guide for the application of natural gas fracturing, where the flow rate is frequently very high." @default.
- W4286565893 created "2022-07-22" @default.
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- W4286565893 date "2023-04-01" @default.
- W4286565893 modified "2023-09-30" @default.
- W4286565893 title "Nanoparticle-induced drag reduction for polyacrylamide in turbulent flow with high Reynolds numbers" @default.
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- W4286565893 doi "https://doi.org/10.1016/j.cjche.2022.07.015" @default.
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