Effects of the extensional rheological properties of polymer solutions on vortex shedding and turbulence characteristics in a two-dimensional turbulent flow

Hidema, Ruri; Murao, Ikumi; Komoda, Yoshiyuki; Suzuki, Hiroshi

doi:10.1016/j.jnnfm.2018.02.001

Cited by 22 publications

(9 citation statements)

References 39 publications

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“…Later, some researchers explained the mechanism of drag reduction from the perspective of turbulence fluctuation decoupling, and further divided the fluid with a drag reducer into many layers on the micro-level, believing that the generation of the vortex between each layer of fluid was inhibited [18]. Hidema [19] added poly(ethylene) oxide (PEO) as a flexible polymer and hydroxypropyl cellulose (HPC) as a rigid polymer in the turbulent flow field. The vortex structure of the flow field shown in Figure 2 was obtained through the interferogram and particle image velocimeter.…”

Section: Turbulence Suppression Hypothesismentioning

confidence: 99%

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Research Progress on the Collaborative Drag Reduction Effect of Polymers and Surfactants

Mou

et al. 2020

Materials

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Polymer additives and surfactants as drag reduction agents have been widely used in the field of fluid drag reduction. Polymer additives can reduce drag effectively with only a small amount, but they degrade easily. Surfactants have an anti-degradation ability. This paper categorizes the mechanism of drag reducing agents and the influencing factors of drag reduction characteristics. The factors affecting the degradation of polymer additives and the anti-degradation properties of surfactants are discussed. A mixture of polymer additive and surfactant has the characteristics of high shear resistance, a lower critical micelle concentration (CMC), and a good drag reduction effect at higher Reynolds numbers. Therefore, this paper focuses more on a drag reducing agent mixed with a polymer and a surfactant, including the mechanism model, drag reduction characteristics, and anti-degradation ability.

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Section: Turbulence Suppression Hypothesismentioning

confidence: 99%

“…Two-dimensional turbulent stratification with polymer: (a) polymer-free solution; (b) poly(ethylene) oxide (PEO) 1.5 × 10 −3 weight percentage solution; (c) hydroxypropyl cellulose (HPC) 0.08 weight percentage solution[19].…”

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confidence: 99%

Research Progress on the Collaborative Drag Reduction Effect of Polymers and Surfactants

Mou

et al. 2020

Materials

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“…We have been studying the effects of extensional rheological properties of polymer solutions on drag reduction using a self-standing flowing soap film to achieve a quasi-two-dimensional (2-D) flow (Hidema et al. 2013, 2014, 2016, 2018, 2020). Two-dimensional turbulent flow is easily formed on flowing soap films by inserting a comb of equally spaced cylinders into the flow (Rutgers et al.…”

Section: Introductionmentioning

confidence: 99%

Modification of turbulence caused by cationic surfactant wormlike micellar structures in two-dimensional turbulent flow

et al. 2021

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An experimental study is performed to investigate the effects of the extensional rheological properties of drag-reducing wormlike micellar solutions on the vortex deformation and turbulence statistics in two-dimensional (2-D) turbulent flow. A self-standing 2-D turbulent flow was used as the experimental set-up, and the flow was observed through interference pattern monitoring and particle image velocimetry. Vortex shedding and turbulence statistics in the flow were affected by the formation of wormlike micelles and were enhanced by increasing the molar ratio of the counter-ion supplier to the surfactant, ξ, or by applying extensional stresses to the solution. In the 2-D turbulent flow, extensional and shear rates were applied to the fluids around a comb of equally spaced cylinders. This induced the formation of a structure made of wormlike micelles just behind the cylinder. The flow-induced structure influenced the velocity fields around the comb and the turbulence statistics. A characteristic increase in turbulent energy was observed, which decreased slowly downstream. The results implied that the characteristic modification of the 2-D turbulent flow of the drag-reducing surfactant solution was affected by the formation and slow relaxation of the flow-induced structure. The relaxation process of the flow-induced structure made of wormlike micelles was very different from that of the polymers.

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“…Hidema [20] studied the relationship between the tensile rheological properties of polymer solutions and the turbulent deformation of the solutions, and determined that there are three kinds of flow states in the two-dimensional turbulent flow of a polymer solution, and that the vortex shedding in the two-dimensional flow is divided into three types, which are affected by the relaxation time of the polymer solution. Furthermore, research by Wouter [21] showed that unsteady turbulence of polymer solutions unsteady turbulence shows general characteristics before reaching a dynamic equilibrium state.…”

Section: Introductionmentioning

confidence: 99%

Rheological Model and Transition Velocity Equation of a Polymer Solution in a Partial Pressure Tool

Huang

et al. 2019

Polymers

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In order to solve the problem of the low production degree of oil layers caused by an excessively large permeability difference between layers during polymer flooding, we propose partial pressure injection technology using a partial pressure tool. The partial pressure tool controls the injection pressure of a polymer solution through a throttling effect to improve the oil displacement effect in high- and low-permeability reservoirs. In order to analyze the influence of the partial pressure tool on the rheological property of the polymer solution, a physical model of the tool is established, the rheological equation of the polymer solution in the partial pressure tool is established according to force balance analysis, the transition velocity equation for the polymer solution is established based on the concept of stability factor, and the influence of varying the structural parameters of the partial pressure tool on the rheological property of the polymer solution is analyzed. The results show that the pressure drop of the polymer solution increases with the decrease of the front groove angle of the partial pressure tool (from 60° to 30°), reaching a maximum of 1.77 MPa at a front groove angle of 30°. Additionally, the pressure drop of the polymer solution increases with the decrease of the outer cylinder radius (from 25 to 24 mm), reaching a maximum of 1.32 MPa at a radius of 24 mm. However, the apparent viscosity of the polymer solution before and after flowing through the partial pressure tool does not change for any of the studied parameters. These research results are of great significance to research on partial pressure injection technology and enhanced oil recovery.

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Effects of the extensional rheological properties of polymer solutions on vortex shedding and turbulence characteristics in a two-dimensional turbulent flow

Cited by 22 publications

References 39 publications

Research Progress on the Collaborative Drag Reduction Effect of Polymers and Surfactants

Research Progress on the Collaborative Drag Reduction Effect of Polymers and Surfactants

Modification of turbulence caused by cationic surfactant wormlike micellar structures in two-dimensional turbulent flow

Rheological Model and Transition Velocity Equation of a Polymer Solution in a Partial Pressure Tool

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