Direct numerical simulation of the turbulent flows of power-law fluids in a circular pipe

Gavrilov, A. A.; Rudyak, V. Ya.

doi:10.1134/s0869864316040016

Cited by 21 publications

(24 citation statements)

References 24 publications

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“…Observed trends for non-Newtonian results presented in § 3 agree with those reported in previous studies, e.g. Rudman & Blackburn (2006), Gavrilov & Rudyak (2016a) and Singh et al (2017b), for turbulent pipe flows.…”

Section: Appendix B Verificationsupporting

confidence: 91%

“…values of the axial vorticity fluctuations and reduced turbulence production with shear-thinning behaviour were documented. Gavrilov & Rudyak (2016a) showed similar results but in addition reported an increase in turbulent kinetic energy with increasing shear thinning and, motivated by the work of Escudier et al (2009), studied for the first time large-scale anisotropy of a purely viscous GN fluid flow through anisotropy-invariant maps (Lumley & Newman 1977) of the Reynolds stress anisotropy tensor. Here the noted increase in anisotropy near the wall with shear thinning is attributed to a suppression of the mechanism of redistribution of fluctuation energy between individual components of the Reynolds stress tensor, but the corresponding budgets, showing such decrease in energy redistribution, are not actually presented.…”

Section: Introductionmentioning

confidence: 61%

“…Experimental issues such as the difficulty in removing unwanted plastic and viscoelastic effects from solutions with polymer additives and the necessity of specialized equipment to study non-Newtonian fluids, which are mostly not optically transparent (Gavrilov & Rudyak 2016 a ), have motivated a growing interest in numerical studies. Direct numerical simulation (DNS) is particularly appealing because it does not require closures for turbulence modelling and allows us to include/exclude plastic and elastic effects from the employed rheological model.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Turbulent channel flow of generalized Newtonian fluids at a low Reynolds number

2020

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Section: Appendix B Verificationsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

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Turbulent channel flow of generalized Newtonian fluids at a low Reynolds number

2020

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“…As the intensity of turbulence increases, the fluctuation of the streamline increases and the fluid changes from fluctuation to spiral motion and eventually to vortex motion, and as the turbulence intensity continues to increase, the vortex motion accelerates until it becomes turbulent. This is consistent with the research theory of Manneville [31], and moreover similar results were obtained by Gavrilov in a study of the turbulent flow of power-law fluids in circular tubes [32]. In the partial pressure tool, the main change in the transition from laminar to turbulent flow occurs in the fluid layer with the most turbulent annular section.…”

Section: Methodssupporting

confidence: 91%

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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“…In a condenser after the technical modification, the resistance loss of circulating water which included the resistance loss along pipeline and the local resistance loss from the inlet water chamber, the folding water chamber and the outlet water chamber increased obviously [4] . The total resistance loss and power consumption increment of circulating water pump were calculated in equation 5~7.…”

Section: Power Consumption Of Circulating Water Pump After Modificationmentioning

confidence: 99%

Numerical Simulation and Optimization of the Screwed Tube Slot Pitch in New Condenser Tube Slot

Lou¹,

Peng²,

Yao³

2018

dtetr

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Abstract. In order to improve the heat transfer efficiency of the condenser, a new type of heat exchange tube has been adopted. The heat transfer effect of the new heat exchange tube was further improved because of the screwed pipe. However, due to the complex flow in the condenser, research on this new type of heat exchange tube is mostly in the theoretical stage. In this paper, we present a numerical simulation approach to optimize the slot pitch and verify the results by experiment.

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Direct numerical simulation of the turbulent flows of power-law fluids in a circular pipe

Cited by 21 publications

References 24 publications

Turbulent channel flow of generalized Newtonian fluids at a low Reynolds number

Turbulent channel flow of generalized Newtonian fluids at a low Reynolds number

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

Numerical Simulation and Optimization of the Screwed Tube Slot Pitch in New Condenser Tube Slot

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