Numerical Simulation of Turbulent Flow and Heat Transfer in a Three-Dimensional Channel Coupled with Flow Through Porous Structures

Yang, Guang; Weigand, Bernhard; Terzis, Alexandros; Weishaupt, Kilian; Helmig, Rainer

doi:10.1007/s11242-017-0995-9

Cited by 27 publications

(11 citation statements)

References 40 publications

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“…The helical electrode mixer consisted of a row clockwise helixes and a row counterclockwise helixes and had a surface area of 63.0 cm 2 . Numerical simulations of the proposed electrodes can be found in literature ,,…”

Section: Resultsmentioning

confidence: 99%

Indirect 3D Printed Electrode Mixers

et al. 2018

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Electrode mixers are ordered 3D flow‐through structures with mixing properties that at the same time act as electrode. Because of their mixing properties, these structures enhance mass transfer at the electrode surface, increasing the limiting‐current plateau. Typically operating at this plateau, the productivity of electrochemical reactors is limited by the mass transport of the reagents. This work presents the fabrication of all‐metal electrode mixers through an indirect 3D printing method. Whereas other techniques suffer from design limitations or come with high capital cost, the proposed rapid prototyping method overcomes these limitations. Using this method, a helical and a cubic electrode mixer was fabricated and their mass transfer properties were characterized and compared to a flat electrode by the limiting current method. Increasing the mass transfer up to 47 % the standard flat electrode is outperformed, demonstrating the valorization potential of electrode mixers and the indirect 3D printing method.

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Section: Resultsmentioning

confidence: 99%

Indirect 3D Printed Electrode Mixers

et al. 2018

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“…In [28] the coupling with a fully resolved pore-network for low Reynolds numbers without heat transfer is used to investigate the effect at the hot gas interface. A monolithic approach for a laminar hot gas flow with a resolved porous medium is presented in [33].…”

Section: Motivationmentioning

confidence: 99%

A Coupled Two-Domain Approach for Transpiration Cooling

König

Rom

Müller

2020

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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Transpiration cooling is an innovative cooling concept where a coolant is injected through a porous ceramic matrix composite (CMC) material into a hot gas flow. This setting is modeled by a two-domain approach coupling two models for the hot gas domain and the porous medium to each other by coupling conditions imposed at the interface. For this purpose, appropriate coupling conditions, in particular accounting for local mass injection, are developed. To verify the feasibility of the two-domain approach numerical simulations in 3D are performed for two different application scenarios: a subsonic thrust chamber and a supersonic nozzle.

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“…Coupled systems of free flow over a porous medium play an important role in many environmental, biological and technical processes. Examples include evaporation from soil governed by atmospheric air flow (Vanderborght et al 2017), intervascular exchange in living tissue (Chauhan et al 2011), preservation of food (Verboven et al 2006), fuel cell water management (Gurau and Mann 2009) or heat exchange systems (Yang et al 2018). Considerable effort has been spent on modeling these kinds of systems where a discrete resolution of the complex porous geometry such as in direct numerical simulation (DNS) is often not computationally feasible for larger systems.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid-Dimensional Coupled Pore-Network/Free-Flow Model Including Pore-Scale Slip and Its Application to a Micromodel Experiment

et al. 2020

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Modeling coupled systems of free flow adjacent to a porous medium by means of fully resolved Navier–Stokes equations is limited by the immense computational cost and is thus only feasible for relatively small domains. Coupled, hybrid-dimensional models can be much more efficient by simplifying the porous domain, e.g., in terms of a pore-network model. In this work, we present a coupled pore-network/free-flow model taking into account pore-scale slip at the local interfaces between free flow and the pores. We consider two-dimensional and three-dimensional setups and show that our proposed slip condition can significantly increase the coupled model’s accuracy: compared to fully resolved equidimensional numerical reference solutions, the normalized errors for velocity are reduced by a factor of more than five, depending on the flow configuration. A pore-scale slip parameter $$\beta _{{{{\rm pore}}}}$$ β pore required by the slip condition was determined numerically in a preprocessing step. We found a linear scaling behavior of $$\beta _{{{{\rm pore}}}}$$ β pore with the size of the interface pore body for three-dimensional and two-dimensional domains. The slip condition can thus be applied without incurring any run-time cost. In the last section of this work, we used the coupled model to recalculate a microfluidic experiment where we additionally exploited the flat structure of the micromodel which permits the use of a quasi-3D free-flow model. The extended coupled model is accurate and efficient.

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Numerical Simulation of Turbulent Flow and Heat Transfer in a Three-Dimensional Channel Coupled with Flow Through Porous Structures

Cited by 27 publications

References 40 publications

Indirect 3D Printed Electrode Mixers

Indirect 3D Printed Electrode Mixers

A Coupled Two-Domain Approach for Transpiration Cooling

A Hybrid-Dimensional Coupled Pore-Network/Free-Flow Model Including Pore-Scale Slip and Its Application to a Micromodel Experiment

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