Heat transfer and mixing enhancement by free elastic flaps oscillation

Ali, Samer; Habchi, Charbel; Menanteau, S.; Lemenand, Thierry; Harion, J.‐L.

doi:10.1016/j.ijheatmasstransfer.2015.01.122

Cited by 80 publications

(24 citation statements)

References 28 publications

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“…In order to improve simulation accuracy and save computing time, choosing a good mesh system is of great significance for solving [27,28]. Correspond to Fig.…”

Section: Resultsmentioning

confidence: 99%

“…9a is slightly better than the others. What's more, the ratio of mixing efficiency to pressure drop (M/∆P) can be used to reveal the 'cost' of mixing to judge whether the structure is good or bad [27]. closely related to the mixing efficiency, and the shape of the 'cost' is similar to the shape of the mixing efficiency.…”

Section: Effect Of the Configuration On Mixing Efficiencymentioning

confidence: 99%

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A novel passive micromixer based on Koch fractal principle

Zhang

Chen

2018

J Braz. Soc. Mech. Sci. Eng.

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This paper aims at studying on the mixing performance of micromixer with Koch fractal microchannel by numerical simulation. Setting up obstacles in the microchannel is an effective way to improve the mixing efficiency, and changing the shape of the obstacle based on the fractal principle can improve the chaotic convection in the microchannel, it can make the performance of the micromixer much better. With different parameters of the fractal obstacle, the effect on the mixing efficiency of the micromixer is different. This study proofs the effect on the mixing efficiency with different heights, distances, numbers and configurations of the obstacles. The number of the obstacles and the distance between the two fractal obstacles have a significant effect on the mixing efficiency. However, the effect of the different configurations on the mixing efficiency is negligible. Comparing the effect with different parameters, with the optimal layout of the obstacles in the microchannel can be obtained based on the Koch fractal principle. With different Res, it can make the mixing efficiency of the micromixer more than 90%. Due to its outstanding mixing performance, fractal micromixer has potential application value in chemical engineering and biochemistry.

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“…In order to improve simulation accuracy and save computing time, choosing a good mesh system is of great significance for solving [27,28]. Correspond to Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Effect Of the Configuration On Mixing Efficiencymentioning

confidence: 99%

A novel passive micromixer based on Koch fractal principle

Zhang

Chen

2018

J Braz. Soc. Mech. Sci. Eng.

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“…As has been stated earlier, the mathematical model governing the structural deformation is discretised using the cell-centred second-order accurate FV method, echoing closely the fluid model discretisation. The origin of the current structural numerical approach is the model firstly proposed by Demirdžić and Muzaferija [22,23]; this FV structural model was later extended and implemented in the OpenFOAM framework and used as a part of the OpenFOAM toolbox by many researchers [24,25,26,27,28,29,30,31,32,33]. In the aforementioned works, the second-order accuracy in space is acheived by using the mid-point rule to approximate the surface and volume integrals of the mathematical model.…”

Section: Introductionmentioning

confidence: 99%

OpenFOAM Finite Volume Solver for Fluid-Solid Interaction

Tuković

Karač

Cardiff

et al. 2018

TFAMENA

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This paper describes a self-contained parallel fluid-structure interaction solver based on a finite volume discretisation, where a strongly coupled partitioned solution procedure is employed.The incompressible fluid flow is described by the Navier-Stokes equations in the arbitrary Lagrangian-Eulerian form, and the solid deformation is described by the Saint Venant-Kirchhoff hyperelastic model in the total Lagrangian form. Both the fluid and the solid are discretised in space using the second-order accurate cell-centred finite volume method, and temporal discretisation is performed using the second-order accurate implicit scheme. The method, implemented in open-source software OpenFOAM, is parallelised using the domain decomposition approach and the exchange of information at the fluid-solid interface is handled using global face zones. The performance of the solver is evaluated in standard two-and threedimensional cases and excellent agreement with the available numerical results is obtained.

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“…Heat transfer enhancement is essential for many engineering applications such as heat exchangers [1,2], electronic equipment [3], high temperature gas turbines [4] or nuclear power plants [5]. Among all methods existing for heat transfer enhancement, some are based on the idea of generating a secondary flow, which is added to the main flow to intensify the fluid exchange between hot and cold regions in the system.…”

Section: Introductionmentioning

confidence: 99%

Effect of rectangular winglet pair roll angle on the heat transfer enhancement in laminar channel flow

Khanjian

Habchi

Russeil

et al. 2017

International Journal of Thermal Sciences

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Convective heat transfer enhancement can be achieved by generating secondary flow structures that are added to the main flow to intensify the fluid exchange between hot and cold regions in the system. One method involves the use of vortex generators to produce streamwise and transverse vortices on the top of the main flow. This study presents numerical computation results on laminar convection heat transfer in a rectangular channel which bottom wall is equipped with rectangular winglet pair vortex generators. The governing equations are solved using finite volume method by considering steady state, laminar regime and incompressible fluid. Three dimensional numerical simulations are performed to study the effect of the generators' roll-angle b on the flow and heat transfer characteristics. Different values of rollangle b in the range [20 e90 ] are considered, while maintaining a constant angle of attack (a ¼ 30) for all the cases. The influence of the Reynolds number is also studied for values 456 and 911 (based on the channel hydraulic diameter). Both local and global analyses of the thermal performances are carried out using parameters such as the Nusselt number and the friction coefficient. In addition, the position and strength of the longitudinal vortices created are presented and discussed, highlighting their effect on the heat transfer rates throughout the duct, for the various generators' roll-angles. Finally, from both local and global investigations, it is found that the optimal values of the roll-angle, determined for each Reynolds number, are not necessarily 90 , which corresponds to the widely used configuration in the open literature.

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Heat transfer and mixing enhancement by free elastic flaps oscillation

Cited by 80 publications

References 28 publications

A novel passive micromixer based on Koch fractal principle

A novel passive micromixer based on Koch fractal principle

OpenFOAM Finite Volume Solver for Fluid-Solid Interaction

Effect of rectangular winglet pair roll angle on the heat transfer enhancement in laminar channel flow

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