Experimental and numerical investigation of isothermal flow in an idealized swirl combustor

Benim, Ali Cemal; Escudier, M. P.; Nahavandi, Ali; Nickson, A.K.; Syed, Khawar; Joos, Franz

doi:10.1108/09615531011024084

Cited by 33 publications

(24 citation statements)

References 33 publications

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“…Uncertainties of some major experimental variables are given in Table 1. The uncertainty in Reynolds number, friction factor and Nusselt number were estimated as + 4.17 %, ± 6.66 % and ± 7.42 %, respectively following the procedure of Bhattacharyya and Saha [11,24].…”

Section: Methodsmentioning

confidence: 99%

“…Many researchers performed surveys on passive enhancement method of this kind, which were very inspiring, such as channel with a cylinder roughness [9] and compound heat transfer enhancement of a convergentdivergent tube with a twisted tape [10].Swirling flow may increase the heat transfer through the boundary layer by interruption or thinning and also increase turbulence intensity [11]. Tube with wire coil inserts [12] can generate vortex and also can develop secondary flow.…”

Section: Introductionmentioning

confidence: 99%

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Heat transfer and flow field in a circular twisted channel

et al. 2018

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In the present paper, along with experimental study, computational fluid dynamics analysis is performed, using the transition SST model which can predict the change of flow regime from laminar through transition to turbulent. The differential governing equations are discretized by the finite volume method. The investigations are conducted for Reynolds numbers ranging from 100 to 50,000 covering laminar, transitional and turbulent regimes, and for three length and three pitch ratios. The predictions are observed to show a good agreement with the measurements and published correlations of other authors. The analysis indicates that the large length ratio and small pitch ratio yields a higher heat transfer rate with relatively low performance penalty. The transition from laminar to turbulent regime is observed between Reynolds numbers of 2,500 to 3,500 for all cases. For almost all investigated cases the performance factors are greater than unity.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat transfer and flow field in a circular twisted channel

et al. 2018

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“…Furthermore, the computing of the problem in the application of the simulation of large eddies (LES) is highly demanding because of the necessity for high resolution mesh in thin boundary layers in the vicinity of the walls, to accurately solve fine turbulent structures occurring there, (Benim et al, 2010 (Spalart, 2009) This led to the development of hybrid URANS / LES methods in which the turbulence in the flow field that is in contact with wall is modelled with RANS turbulence models, while the flow in the core, away from the wall and in the areas of separations are solved with LES. Since of the all hybrid methods Detached-Eddy Simulation (DES) is the most developed and validated, it has been adopted in this work, .…”

Section: Simulation Of Detached Eddies (Des)mentioning

confidence: 99%

CFD flow analysis in the centrifugal vortex pump

Mihalić

Guzović²,

Predin³

2014

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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Purpose – Aging of the oil wells leads to a decrease in reservoir pressure and also to an increase in the water, gas and abrasive particles content. Therefore, there is a need for the oil pumps exploitation characteristics improvements. This paper aims to generate a valuable numerical model which will provide a useful tool to study various cases. Design/methodology/approach – Computational fluid dynamics (CFD) analysis of the generation of so-called coherent structures of eddies and turbulence in the peripheral area of the vortex rotor mounted at the back side of centrifugal rotor was undertaken. After detailed analysis of the influence of the used turbulence models on the results, a hybrid turbulent model Detached Eddies Simulation (DES) was chosen as the most suitable. Findings – Numerical control volume method with unsteady solver and DES turbulence model was proven to be valuable tool for flow analysis in the centrifugal pumps. Having in mind that DES turbulence model consumes much less computational time than large eddies turbulence model, this is a very useful fact that resulted from this research. Practical implications – The proven numerical model is robust and reliable enough to become a standard method in simulating flow and other physical phenomena occurring in centrifugal pumps and similar turbo machines. This makes it possible to easily research different factors that influence their performances. Originality/value – Comprehensive experimental and CFD study was performed which made it possible to conduct detailed validation and verification of described CFD model.

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“…Many researchers performed surveys on passive enhancement method of this kind, which were very inspiring, such as channel with a cylinder roughness [9] and compound heat transfer enhancement of a convergent-divergent tube with a twisted tape [10]. Swirling flow may increase the heat transfer through the boundary-layer by interruption or thinning and also increase the turbulence levels considerably [11]. Tube with wire coil inserts [12] can generate vortex and also can develop secondary flow.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analysis of forced convection in a twisted tube

et al. 2019

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Original scientific paper https://doi.org/10.2298/TSCI19S4043BIn the present paper, along with experimental study, CFD analysis of forced convection in a twisted tube is performed, using the transition SST model which can predict the change of flow regime from laminar through transition to turbulent. The differential governing equations are discretized by the finite volume method. The investigations are conducted for Reynolds numbers ranging from 100 to 50000 covering laminar, transitional and turbulent regimes, and for three length and three pitch ratios. The predictions are observed to show a good agreement with the measurements and published correlations of other authors. The analysis indicates that the large length ratio and small pitch ratio yields a higher heat transfer rate with relatively low performance penalty. The transition from laminar to turbulent regime is observed between Reynolds numbers of 2500 to 3500 for all cases. For almost all investigated cases the performance factors are greater than unity.

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Experimental and numerical investigation of isothermal flow in an idealized swirl combustor

Cited by 33 publications

References 33 publications

Heat transfer and flow field in a circular twisted channel

Heat transfer and flow field in a circular twisted channel

CFD flow analysis in the centrifugal vortex pump

Experimental and numerical analysis of forced convection in a twisted tube

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