Developments in the Flow of Complex Fluids in Tubes by Dennis A. Siginer

By Dennis A. Siginer

This ebook is devoted to the tube movement of viscoelastic fluids and Newtonian unmarried and multi-phase particle-laden fluids. This succinct quantity collects the newest analytical advancements and experimental findings, specifically in predicting the secondary box, highlighting the ancient advancements which ended in the growth made. This e-book brings a clean and special standpoint and covers and translates efforts to version laminar stream of viscoelastic fluids in tubes and laminar and turbulent circulation of unmarried and multi-phase particle-laden circulate of linear fluids within the gentle of the newest findings.

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These shapes may be vesicles or disklike or may look like long cylinders called rodlike or wormlike micelles, which are generally considered excellent drag-reducing agents, Ohlendorf et al. [82]. The forces, which hold the surfactant molecules together in micelles, are much weaker than the primary chemical bonds of polymer molecules. But these forces persist even if the micelles encounter strong shear and breakup. They reform or self-assemble when the strong shear disappears, while polymer molecules cannot reform after mechanical degradation.

We now know that is not the case. That this was not the case was suspected by Townsend et al. [128] who conducted experiments with six test fluids in square sectional tubes and an extension of the theoretical analysis of Dodson et al. [127] to conclude that the direction of the streamlines is not indicative of the sign of N2. The difference between the analyses of these two investigations is that Townsend et al. [128] did not identify N2 as the perturbation parameter and did not take it to be a constant.

We now know that is not the case. That this was not the case was suspected by Townsend et al. [128] who conducted experiments with six test fluids in square sectional tubes and an extension of the theoretical analysis of Dodson et al. [127] to conclude that the direction of the streamlines is not indicative of the sign of N2. The difference between the analyses of these two investigations is that Townsend et al. [128] did not identify N2 as the perturbation parameter and did not take it to be a constant.

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