Polymer drag-reducing agents for transportation of hydrocarbon liquids: Mechanism of action, estimation of efficiency, and features of production

Nesyn, G. V.; Manzhai, V. N.; Suleimanova, Yu. V.; Stankevich, V. S.; Konovalov, K. B.

doi:10.1134/s0965545x12010051

Cited by 9 publications

(2 citation statements)

References 5 publications

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“…In contrast, drag-reducing polymer additives focus on adding soluble long-chain polymers to the fluid flow to tune fluid properties and control the vortex structures [ 16 , 17 ]. However, it is usually restricted to flow in closed channels that does not entail the frequent addition needed to sustain a proper concentration of drag-reducing agents [ 18 , 19 ]. Using bionic surfaces is a promising passive approach in drag reduction and has received tremendous research attention, since it borrows the evolved surface structures and functions of living nature to alter the turbulent structure of the boundary layer flow [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Bidirectional Underwater Drag Reduction on Bionic Flounder Two-Tier Structural Surfaces

Liu

Zhan

et al. 2023

Biomimetics

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Engineering marvels found throughout the exclusive structural features of biological surfaces have given rise to the progressive development of skin friction drag reduction. However, despite many previous works reporting forward drag reduction where the bio-inspired surface features are aligned with the flow direction, it is still challenging to achieve bidirectional drag reduction for non-morphable surface structures. Inspired by the flounder ctenoid scales characterized by tilted, millimeter-sized oval fins embedded with sub-millimeter spikes, we fabricate a bionic flounder two-tier structural surface (BFTSS) that can remarkably reduce the forward skin friction drag by ηdr = 19%. Even in the backwards direction, where the flow is completely against the tilting direction of surface structures, BFTSS still exhibits a considerable drag reduction of ηdr = 4.2%. Experiments and numerical simulations reveal that this unique bidirectional drag reduction is attributed to synergistic effects of the two-tier structures of BFTSS. The array of oval fins can distort the boundary layer flow and mitigate the viscous shear, whilst the microscale spikes act to promote the flow separation to relieve the pressure gradient in the viscous sublayer. Notably, the pressure gradient relief effect of microscale spikes remains invariant to the flow direction and is responsible for the backward drag reduction as well. The bidirectional drag reduction of BFTSS can be extensively applied in minimizing the energy consumption of ships and underwater vessels, as well as in pipeline transport.

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Section: Introductionmentioning

confidence: 99%

Bidirectional Underwater Drag Reduction on Bionic Flounder Two-Tier Structural Surfaces

Liu

Zhan

et al. 2023

Biomimetics

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“…However, a non-negligible reduction is at the expense of draining the lubricating liquid [16]. A flowing intermediate liquid at the solid interface is the method of choice for transporting hydrocarbon products [17],…”

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confidence: 99%

Fluid Drag Reduction by Magnetic Confinement

et al. 2022

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The frictional forces of a viscous liquid flow are a major energy loss issue and severely limit microfluidics practical use. Reducing this drag by more than a few tens of percent remain elusive. Here, we show how cylindrical liquid−in−liquid flow leads to drag reduction of 60−99% for sub-mm and mm-sized channels, regardless of whether the viscosity of the transported liquid is larger or smaller than that of the confining one. In contrast to lubrication or sheath flow, we do not require a continuous flow of the confining lubricant, here made of a ferrofluid held in place by magnetic forces. In a laminar flow model with appropriate boundary conditions, we introduce a modified Reynolds number with a scaling that depends on geometrical factors and viscosity ratio of the two liquids. It explains our whole range of data and reveals the key design parameters for optimizing the drag reduction values. Our approach promises a new route for microfluidics designs with pressure gradient reduced by orders of magnitude.

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Stability of the dispersed system in inverse emulsion polymerization of ionic acrylate monomers

et al. 2021

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Polymer drag-reducing agents for transportation of hydrocarbon liquids: Mechanism of action, estimation of efficiency, and features of production

Cited by 9 publications

References 5 publications

Bidirectional Underwater Drag Reduction on Bionic Flounder Two-Tier Structural Surfaces

Bidirectional Underwater Drag Reduction on Bionic Flounder Two-Tier Structural Surfaces

Fluid Drag Reduction by Magnetic Confinement

Stability of the dispersed system in inverse emulsion polymerization of ionic acrylate monomers

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