Large eddy simulation of turbulent flows in a rotating concentric annular channel

Liu, Nansheng; Lu, Xi‐Yun

doi:10.1016/j.ijheatfluidflow.2004.10.005

Cited by 23 publications

(6 citation statements)

References 44 publications

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“…To demonstrate that the results calculated by the numerical methods used are reliable, extensive validations have been undertaken in this study and in our previous work [35][36][37][38][39][40][41][42][43]. Usually, the high-order statistical turbulence quantities are more sensitive to the numerical methods.…”

Section: Methodsmentioning

confidence: 84%

“…Furthermore, some typical comparisons with the previous results, including the mean velocity, turbulence intensities and shear stress, and vorticity fluctuations, are also given in the following section. On the other hand, the relevant code and method have been verified in our previous work [35][36][37][38][39][40][41][42][43], in particular for detailed validations for stably and unstably stratified open channel flows based on DNS [35]. Thus, it is ensured that numerical approach is reliable to predict turbulence characteristics in the spanwise rotating channel.…”

Section: Methodsmentioning

confidence: 85%

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A numerical investigation of turbulent flows in a spanwise rotating channel

Liu

2007

Computers & Fluids

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Section: Methodsmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 85%

A numerical investigation of turbulent flows in a spanwise rotating channel

Liu

2007

Computers & Fluids

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“…This method of classification yield could become inconsistent considering the variety of parameters that can be varied and how intertwined their effects could be. Furthermore, another group of studies that implement DNS and LES models for annular fluid turbulence modelling exists (Chung et al, 2002;Feiz et al, 2003;Chung and Sung, 2005;Liu and Lu, 2005;Ninokata et al, 2006), but with very little consideration given to the treatment of the particulate phase; they however, pay detailed concentration to fluid shearing/viscous behaviour under different conditions. Hence, we limit the discussion to very recent pertinent research works in which the RANS equations are solved for the continuous and dispersed phases respectively.…”

Section: Related Literaturementioning

confidence: 99%

Drill cuttings transport and deposition in complex annular geometries of deviated oil and gas wells: A multiphase flow analysis of positional variability

Epelle

Gerogiorgis

2019

Chemical Engineering Research and Design

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In this study, the two-fluid Eulerian-Eulerian multiphase flow model in ANSYS Fluent (v17.1) is adopted for the simulation of cuttings transport in a deviated annular geometry using two different non-Newtonian drilling fluids (described using the power law and Herschel-Bulkley models). The Syamlal-O'Brien interphase momentum exchange coefficient is implemented to capture non-spherical effects of the drill cuttings. The analysis conducted is based on the hypothesis that a position-dependent profile evaluation is expected to yield more insight into the transport process compared to a volume-averaged analysis over the entire flow domain. This is because the adopted simulation approach takes into account the microscopic particle properties which significantly affect the overall particle transport mechanism. However, this requires the application of robust postprocessing functionalities for data extraction from desired annular regions. Particle sizes considered are in the range of 0.002 m to 0.008 m with a sphericity range of 0.5 to 1.0. A rotational effect is incorporated in our model to describe the drillpipe motion in an annular wellbore with a vertical eccentricity of 0.6. The considered geometry contains a vertical, inclined and horizontal section with interconnecting upper and lower bends. The analysis of the particle velocity and concentration profiles revealed that the mud rheology, particle sphericity and particle sizes play vital roles in determining the cuttings removal process. It is particularly observed that the lower annular region of upper bend, is most susceptible to particle deposition with the lowest transport velocities observed. Our positional variability analysis has shown that the alternating dominance of nonspherical and spherical particles' velocities significantly depends on the nature of the flow (i.e. dense granular flow or dilute annular flow in the upper and lower sections respectively).

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“…The simultaneous use of two or more techniques in the annular channel significantly enhanced the heat transfer greater than that found by either of them when used individually. Various compound techniques that are used to enhance heat transfer in annular channel can be found in literature [4,[11][12][13][14][15][16]. A lot of work has been performed for heat transfer enhancement on the annular space between two pipes.…”

Section: Introductionmentioning

confidence: 99%

“…A lot of work has been performed for heat transfer enhancement on the annular space between two pipes. Omkar [15] evaluated the heat transfer characteristics data for the helical fins that were installed on the rotating inner tube of double pipe heat exchanger. The laminar flow results showed that the Nusselt number is found to increase up to 64 % at 100 rpm compared to stationary inner tube with helical fins.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement through Annular Flow using Rotating Finned Pipe

Yassin

El-Hameed

Shedid

et al. 2017

International Conference on Aerospace Sciences and Aviation Tec

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The thermal characteristics for the flow through the annulus with inner finned tube under stationary and rotating conditions are experimentally investigated. The experiments are carried out using both unfinned and finned tubes at different rotating speeds range from 0 to 400 rpm. The effect of fins number and its heights are studied for the straight fins which used with inner pipe. The Reynolds number ranged from 3x104 to 9x104, while Taylor number ranged from 3x106 to 11x106. The results showed an increase of the heat transfer coefficient more than six times for the height of 30 mm and rotational speeds of 400 rpm at Re = 6x104, compared to the case for plain stationary pipe. The rotational speed revealed no effect on the efficiency and effectiveness of the fin. Correlation for Nusslet number and the overall efficiency are obtained.

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Large eddy simulation of turbulent flows in a rotating concentric annular channel

Cited by 23 publications

References 44 publications

A numerical investigation of turbulent flows in a spanwise rotating channel

A numerical investigation of turbulent flows in a spanwise rotating channel

Drill cuttings transport and deposition in complex annular geometries of deviated oil and gas wells: A multiphase flow analysis of positional variability

Heat Transfer Enhancement through Annular Flow using Rotating Finned Pipe

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