Literature Survey of Numerical Heat Transfer (2010–2011)

Shih, Tien-Mo; Zheng, Yingbin; Arie, Martinus; Zheng, Jin‐Cheng

doi:10.1080/10407782.2013.784652

Cited by 12 publications

(2 citation statements)

References 1,348 publications

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“…Other relevant references in the field are the three review articles by Shih et al (2010, 2011, 2013). Their generic topic is numerical heat transfer, but they contain a total number of 282 references on the issue of unsteadiness applied to heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

Comparison of three-dimensional flow mixing via pulsation and dynamical stirring: application to the mixing of parallel streams at different temperatures

Sastre

Martín

Velázquez

et al. 2021

HFF

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Purpose This paper aims to compare the performance of flow pulsation versus flow stirring in the context of mixing of a passive scalar at moderate Reynolds numbers in confined flows. This comparison has been undertaken in two limits: diffusion can be neglected as compared to convection (very large Peclet) and diffusion and convection effects are comparable. The comparison was performed both in terms of global parameters: pumping power and mixing efficiency and local flow topology. Design/methodology/approach The study has been addressed by setting up a common conceptual three-dimensional problem that consisted of the mixing of two parallel streams in a square section channel past a square section prism. Stirring and pulsation frequencies and amplitudes were changed and combined at an inlet Reynolds number of 200. The numerical model was solved using a finite volume formulation by adapting a series of open-source OpenFOAM computational fluid dynamic (CFD) libraries. For cases with flow pulsation, the icoFoam solver for laminar incompressible transient flows was used. For cases with stirring, the icoDyMFoam solver, which uses the arbitrary Lagrangian–Eulerian method for the description of the moving dynamical mesh, was used to model the prism motion. At the local flow topology level, a new method was proposed to analyze mixing. Time evolution of folding and wrinkling of sheets made up of virtual particles that travel along streak lines was quantified by generating lower rank projections of the sheets onto the spaces spanned by the main eigenvectors of an appropriate space-temporal data decomposition. Findings In the limit when convection is dominant, the results showed the superior performance of stirring versus flow pulsation both in terms of mixing and required pumping power. In the cases with finite Peclet, the mixing parameters by stirring and flow pulsation were comparable, but pulsation required larger pumping power than stirring. For some precise synchronization of stirring and pulsation, the mixing parameter reached its maximum, although at the expense of higher pumping power. At the local flow topology level, the new method proposed to quantify mixing has been found to correlate well with the global mixing parameter. Originality/value A new systematic comparative study of two methods, stirring and pulsation, to achieve mixing of passive scalars in the mini scale for confined flows has been presented. The main value, apart from the conclusions, is that both methods have been tested against the same flow configuration, which allows for a self-consistent comparison. Of particular interest is the fact that it has been found that accurate synchronization of both methods yields mixing parameters higher than those associated to both methods taken separately. This suggests that it is possible to synchronize mixing methods of a different nature to achieve optimum designs. The new theoretical method that has been proposed to understand the mixing performance at the local level has shown promising results, and it is the intention of the authors to test its validity in a broader range of flow parameters. All these findings could be taken as potential guidelines for the design of mixing processes in the mini scale in the process industry.

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Section: Introductionmentioning

confidence: 99%

Comparison of three-dimensional flow mixing via pulsation and dynamical stirring: application to the mixing of parallel streams at different temperatures

Sastre

Martín

Velázquez

et al. 2021

HFF

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“…The problem of the study of nanostructure states formation and evolution in the materials exposed to concentrated energy flows has attracted scientists' attention for a long time [1]. Nanostructure states formed on the surface of materials exposed to such flows improve their strength and wear resistance [2,3]. One of the most efficient methods of creating such states is arc surfacing [4].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Conditions for Microdroplets Formation and their Detachment from the Molten Metal on the Electrode

Sarychev

Solodsky

Невский

et al. 2021

SSP

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Formation of nanostructure states on the surface of materials exposed to concentrated flows of energy is one of the relevant problems of modern materials processing. In the paper the authors describe the mechanism of the micro-scale droplets formation based on the study and modeling of the physical processes and technological aspects of the interaction between the heterogenic plasma flows and the molten substance at the electrode tip. The authors show new physical mechanisms and criteria for micro-and nanoparticles origination, develop a physical-mathematical model of the interaction between the molten metal and the plasma discharge with imposed high-frequency pulse action.

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Shock wave boundary layer interactions in hypersonic flows over a double wedge geometry by using conjugate heat transfer

2020

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Literature Survey of Numerical Heat Transfer (2010–2011)

Cited by 12 publications

References 1,348 publications

Comparison of three-dimensional flow mixing via pulsation and dynamical stirring: application to the mixing of parallel streams at different temperatures

Comparison of three-dimensional flow mixing via pulsation and dynamical stirring: application to the mixing of parallel streams at different temperatures

Modeling the Conditions for Microdroplets Formation and their Detachment from the Molten Metal on the Electrode

Shock wave boundary layer interactions in hypersonic flows over a double wedge geometry by using conjugate heat transfer

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