Euler–Euler simulations of condensing two-phase flows in mini-channel: Combination of a sub-grid approach and an interface capturing approach

Davy, Gordon; Reyssat, Étienne; Vincent, Stéphane; Mimouni, S.

doi:10.1016/j.ijmultiphaseflow.2021.103964

Cited by 9 publications

(6 citation statements)

References 43 publications

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“…The RMS field supported the presence of droplets, as it was not strictly equal to 0 in the vapor sky; however, droplets were only passively transported in the present version of the code. Future work should take advantage of the droplet momentum transfer closure proposed by Davy et al [34,35]. High RMS fields were located in the vicinity of the interface, which confirmed the presence of waves in the flow: the asymmetric character of these fields could be explained by the influence of the last elbow, which implied a high asymmetric flow with respect to the vertical axis.…”

Section: Void Fractionmentioning

confidence: 54%

Euler–Euler Multi-Scale Simulations of Internal Boiling Flow with Conjugated Heat Transfer

2023

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A numerical approach was implemented, to study a boiling flow in a horizontal serpentine tube. A NEPTUNE_CFD two-fluid model was used, to study the behavior of the refrigerant R141b in diabatic cases. The model was based on the Euler–Euler formalism of the Navier–Stokes equations, in which governing equations are solved for both phases of the fluid at each time step. The conjugate heat transfer—between the tube wall and the fluid—was considered via a coupling with the SYRTHES 4.3 software, which solves solid conduction in three dimensions. A mesh convergence study was carried out, which found that a resolution of 40 meshes per diameter was necessary for our case. The approach was validated by comparison with an experimental study of the literature, based on the faithful reproduction of the positions of two-phase flow regime transitions in the domain. Original post-processing was used, to unravel the flow characteristics. The mean and RMS fields of void fraction, temperatures and stream wise velocities in several sections were analyzed, when statistical convergence was reached. A thermal equilibrium was reached in the saturated liquid, but not in the vapor phase, due to the flow dynamic and possibly the presence of droplets. Finally, a thermal analysis of the configuration was proposed. It demonstrated the strong coupling between the temperature distribution in the solid, and the two-phase flow regimes at stake in the fluid domain.

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Section: Void Fractionmentioning

confidence: 54%

Euler–Euler Multi-Scale Simulations of Internal Boiling Flow with Conjugated Heat Transfer

2023

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“…43 The gas and liquid phases are treated as the continuous phase, while the solid phase is regarded as the discrete phase. In the main part, the Euler−Euler two fluid model 44 was adopted to simulate the flow state of the gas−liquid phase in the TCR, and the Navier−Stokes equation group used to describe the system was solved. The mass and momentum conservation equations for each phase can be expressed as 45…”

Section: Hydrodynamic Modelmentioning

confidence: 99%

Integrated Taylor–Couette Reactor Model for Heterogeneous Photocatalytic Degradation of AO7

Wang,

Chen,

Wei

et al. 2024

Ind. Eng. Chem. Res.

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Taylor−Couette reactors have exhibited great potential for applications in heterogeneous photocatalysis. In this study, an integrated computational fluid dynamic model combining the Euler−Lagrange approach, the discrete ordinate model, the discrete phase model, and the user-defined functions was established to simulate the process of the photocatalytic degradation of acid orange 7 with titanium dioxide and to reveal the interaction among the flow field, radiation field, particle distributions, and reaction kinetics. The results show that an inner cylinder rotation speed of 11.96 rad/s and a light source intensity of over 23 W/m 2 help photocatalysts absorb more photons. The catalysts with a particle size over 300 nm and a mass concentration of 1 g/L give a higher photodegradation efficiency. With the help of this model, heterogeneous photocatalysis technology with Taylor−Couette reactors as the key component can be scaled up for industrial applications in organic pollutant removal.

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“…The second model used in this paper is the GLIM (presented in detail in [21][22][23]). The GLIM was developed to model multi-regime two-phase flows.…”

Section: The Generalised Large Interface Model (Glim)mentioning

confidence: 99%

“…The three models used in the GLIM (the bubble model, the droplet model, and the large interface model) were validated separately on many experiments from the validation basis of neptune_cfd ( [28,29] for the droplet model [30] for the LIM). The combination of these three models into the GLIM was validated on adiabatic cases, such as the emptying of a bottle [22] and on several cases involving heat and mass transfer (condensing two-phase flows in mini-channels [23]). The modelling of Saury's experiments on flash boiling in this article aim to expand the validation range of the GLIM.…”

Section: The Generalised Large Interface Model (Glim)mentioning

confidence: 99%

Numerical Modelling of Water Flashing at Sub-Atmopsheric Pressure with a Multi-Regime Approach

Loiseau

Mimouni

Colmont

et al. 2023

Fluids

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The CFD numerical study of the flash boiling phenomenon of a water film was conducted using an Euler–Euler method, and compared to the experiments on the flashing of a water film. The water film is initially heated at temperatures ranging from 34 to 74 ∘C (frim 1 to 41 ∘C superheat), and the pressure is decreased from 1 bar to 50 mbar during the experiments. This paper shows that the experiments could not be correctly modelled by a simple liquid/bubble model because of the overestimation of the drag force above the water film (in the gas/droplet region). The generalised large interface model (GLIM), however, a multi-regime approach implemented in the version 7.0 of the neptune_cfd software, is able to differentiate the water film, where liquid/bubble interactions are predominant from the gas region where gas/droplet interactions are predominant, and gives nice qualitative results. Finally, this paper shows that the interfacial heat transfer model of Berne for superheated liquids could accurately predict the evolution of the water temperature over time.

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Euler–Euler simulations of condensing two-phase flows in mini-channel: Combination of a sub-grid approach and an interface capturing approach

Cited by 9 publications

References 43 publications

Euler–Euler Multi-Scale Simulations of Internal Boiling Flow with Conjugated Heat Transfer

Euler–Euler Multi-Scale Simulations of Internal Boiling Flow with Conjugated Heat Transfer

Integrated Taylor–Couette Reactor Model for Heterogeneous Photocatalytic Degradation of AO7

Numerical Modelling of Water Flashing at Sub-Atmopsheric Pressure with a Multi-Regime Approach

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