Developments in the Flow of Complex Fluids in Tubes

Siginer, Dennis A.

doi:10.1007/978-3-319-02426-4

Cited by 15 publications

(9 citation statements)

References 349 publications

(681 reference statements)

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“…Yakhot and Orszag (1992) initially derived the RNG (Renormalization Group) turbulent model based on the kε turbulent model and improved it by Yakhot et al in Shih et al (1995) with scale expansions for the Reynolds stress and production of dissipation terms. Speziale and Thangam in Siginer (2015) specified that the RNG model could be a turbulence model, both for practical engineering and scientific purposes. Then, both numerical and physical 3D modeling result are analysed (Shih et al, 1995;Siginer, 2015).…”

Section: Methodsmentioning

confidence: 99%

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Numerical Analysis of Velocity Magnitude on Wave Energy Converter System in Perforated Breakwater

Setyandito

Nizam

Pierre

et al. 2021

Int. J. Renew. Energy Dev.

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Waves are an alternative energy source that can be used for electricity generation. Wave Energy Converter (WEC) system in perforated breakwater is potentially applicable WEC system for coastal area. The magnitude of wave energy generated is determined by the volume of sea water inside the perforated breakwater. This volumetric flow rate is calculated using the flow velocity at perforated holes on the structure slope. Therefore, this research aims to study the velocity magnitude by analyzing the interrelation among wave steepness, wave run-up and relative velocity. The method used consists of applying numeric 3D flow model in the perforated structure of the breakwater with the variation of wave height, wave period and structure slope. The result shows that, the steeper the structure, the bigger is the relative run up (Ru/H). The higher the relative run up, the higher are the relative run-up velocities (V/Vru). As the velocity increase, the volumetric flow rate inside perforated breakwater will be higher, which leads to higher wave energy. Hence, it can be concluded that the higher the velocities (V/Vru), the higher is the wave energy generated.

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Section: Methodsmentioning

confidence: 99%

“…Speziale and Thangam in Siginer (2015) specified that the RNG model could be a turbulence model, both for practical engineering and scientific purposes. Then, both numerical and physical 3D modeling result are analysed (Shih et al, 1995;Siginer, 2015).…”

Section: Methodsmentioning

confidence: 99%

Numerical Analysis of Velocity Magnitude on Wave Energy Converter System in Perforated Breakwater

Setyandito

Nizam

Pierre

et al. 2021

Int. J. Renew. Energy Dev.

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“…D = 1 2 (∇u+∇u T ) is the deformation rate tensor and τ p is the extra-stress tensor. In present work, the Phan-Thien-Tanner constitutive model (PTT) 38,39 is chosen to describe τ p :…”

Section: A Governing Equationsmentioning

confidence: 99%

Oscillating onset of the Rayleigh–Bénard convection with viscoelastic fluids in a slightly tilted cavity

et al. 2023

Self Cite

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The oscillating onset of the Rayleigh-Bénard convection (RBC) with viscoelastic fluids in a slightly tilted 2-dimension (2D) rectangular cavity with aspect ratio Γ = 2 was investigated for the first time via direct numerical simulation. A series of simulations were conducted in the plane of the Rayleigh number (Ra) and the tilt angle (α ∈ [0◦,5◦]) with three Weissenberg numbers (Wi = (0.1,0.15,0.2)) at a fixed Prandtl number Pr = 7.0. The evolutionary path of the oscillating convection onset in the (Wi,α)-plane was determined and corresponding complex flow structures were observed. The inclination of the box delays the onset of the oscillations and the corresponding Rayleigh number Rac as compared to the horizontal configuration. Oscillating flow structures acquire the attributes of a traveling wave. A specific feature of the oscillating convection in the case of the horizontal cavity, the periodicity in space and time exists in the inclined box case as well. But, the evolution of the oscillatory flow structure is very different from the horizontal case in that the counter-clockwise cell assimilates the clockwise cell.

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“…It is important to emphasize the common features of and the links between three seemingly different internal flows, turbulent duct flow of Newtonian fluids, and tube flows of viscoelastic and particle laden fluids in order to help bridge the mechanics of all three, because secondary motions appear as a common thread through afore-mentioned flow types. It is not possible to develop a good understanding of the mechanics of secondary field in the flow of viscoelastic and particle laden fluids without a clear grasp of the underlying driving mechanisms of the turbulent secondary flows of Newtonian fluids [7]. At the end of this introductory paragraph on secondary motions from a broad viewpoint (fluid -geometryflow; fluid stress-strain rate relationship: Newtonian -non-Newtonian; duct centerline axis: straight -curved; duct cross-sectional shape: circular -non-circular; duct cross-sectional area/shape: constant -varying; flow configuration: external -internal; flow regime: laminarturbulent), there is an interesting fact observed in corner-flow configurations of Newtonian fluids where we encounter one of the rare cases where laminar and turbulent flows show completely different tendencies in their general behavior.…”

Section: Introductionmentioning

confidence: 99%

Specific aspects of turbulent flow in rectangular ducts

Stanković¹,

Belošević²,

Crnomarković³

et al. 2017

THERM SCI

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The essential ideas of investigations of turbulent flow in a straight rectangular duct are chronologically presented. Fundamentally significant experimental and theoretical studies for mathematical modeling and numerical computations of this flow configuration are analyzed. An important physical aspect of this type of flow is presence of secondary motion in the plane perpendicular to the streamwise direction, which is of interest from both the engineering and the scientific viewpoints. The key facts for a task of turbulence modeling and optimal choice of the turbulence model are obtained through careful examination of physical mechanisms that generate secondary flows. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no.TR-33018: Increase in Energy and Ecology Efficiency of Processes in Pulverized Coal-Fired Furnace and Optimization of Utility Steam Boiler Air Pre-heater by Using In-House Developed Software Tools]

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Developments in the Flow of Complex Fluids in Tubes

Cited by 15 publications

References 349 publications

Numerical Analysis of Velocity Magnitude on Wave Energy Converter System in Perforated Breakwater

Numerical Analysis of Velocity Magnitude on Wave Energy Converter System in Perforated Breakwater

Oscillating onset of the Rayleigh–Bénard convection with viscoelastic fluids in a slightly tilted cavity

Specific aspects of turbulent flow in rectangular ducts

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