Modelling and simulation of flow boiling with an Eulerian-Eulerian approach and integrated models for bubble dynamics and temperature-dependent heat partitioning

Setoodeh, Hamed; Ding, Wei; Lucas, Dirk; Hampel, Uwe

doi:10.1016/j.ijthermalsci.2020.106709

Cited by 22 publications

(2 citation statements)

References 41 publications

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“…Although, the boiling process still a considerably difficult problem compared to single phase flows because of the higher complexity of the physical phenomena involved (Kandlikar et al, 1999;Khan & Fartaj, 2010). Most of the studies dedicated to numerically simulate boiling flows have focused on techniques for accurate reproduction of the boiling phenomenon (Setoodeh et al, 2020;Bathi et al, 2020;Naghibzadeh et al, 2020). Therefore, little research has been done so far with the aim of exploring the geometric aspects of microchannels subjected to boiling flows.…”

Section: Reports In Mechanical Engineeringmentioning

confidence: 99%

Geometrical investigation of microchannel with two trapezoidal blocks subjected to laminar convective flows with and without boiling

et al. 2022

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Microchannels are important devices to improve the heat exchange in several engineering applications as heat, ventilation and air conditioning, microelectronic cooling, power generation systems and others. The present work performs a numerical study of a microchannel with two trapezoidal blocks subjected to laminar flows, aiming to analyze the influence of the boiling process on the geometric configuration of the microchannel. Constructal Design and Exhaustive Search are used for the geometrical evaluation of the blocks. The Mixture multi-phase model and the Lee phase change model were both employed for the numerical simulation of the boiling process. In this study, the influence of the height and higher width of the first block (H11/L11) over the heat transfer rate and pressure drop for different magnitudes of the ratio between the lower width and higher width (L12/L11) was investigated. It is considered water in monophase cases and water/vapor mixture for multiphase flow. Two different Reynolds numbers (ReH = 0.1 and 10.0) were investigated. Results indicated that, for the present thermal conditions, the consideration of boiling flows were not significant for prediction of optimal configurations. Results also showed that in the cases where the boiling process was enabled, the multi-objective performance was higher than in the cases without boiling, especially for ReH = 0.1.

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Section: Reports In Mechanical Engineeringmentioning

confidence: 99%

Geometrical investigation of microchannel with two trapezoidal blocks subjected to laminar convective flows with and without boiling

et al. 2022

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“…They concluded that the nucleation site density and bubble diameter significantly impact various key heat transfer parameters (e.g., volume fraction, liquid temperature), proposing that the best closure model is a combination of the empirical correlation of Lemmert and Chawla [26] for the nucleation site density, Unal [27] for the bubble detachment diameter, and Cole [28] for the bubble departure frequency. More recently, different numerical studies using the Eulerian-Eulerian two-fluid model for the prediction of various parameters have verified the use of different empirical model combinations of the wall partitioning model, depending on the working conditions [29][30][31][32]; however, they did not conclude a more global combination of the models that could be widely used. At this point it is also worth mentioning that the interfacial dynamics in the boiling heat transfer phenomena can also be modelled numerically with other techniques such as interface capturing methods (i.e., [33]) and mesh-less techniques such as the moving particle semi-implicit method (i.e., [34]); however, such techniques mainly focus on resolving the interface dynamics and are thus more applicable to studying local phenomena.…”

Section: Introductionmentioning

confidence: 99%

Validation of the Eulerian–Eulerian Two-Fluid Method and the RPI Wall Partitioning Model Predictions in OpenFOAM with Respect to the Flow Boiling Characteristics within Conventional Tubes and Micro-Channels

Vontas,

Pavarani,

Miché

et al. 2023

Energies

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Flow boiling within conventional, mini and micro-scale channels is encountered in a wide range of engineering applications such as nuclear reactors, steam engines and cooling of electronic devices. Due to the high complexity and importance of the boiling process, several numerical and experimental investigations have been conducted for the better understanding of the underpinned physics and heat transfer characteristics. One of the most widely used numerical approaches that can analyse such phenomena is the Eulerian–Eulerian two-fluid method in conjunction with the RPI model. However, according to the current state-of-the-art methods this modelling approach heavily relies on empirical closure relationships derived for conventional channels, limiting its applicability to mini- and micro-scale channels. The present paper aims to give further insights into the applicability of this modelling approach for non-conventional channels. For this purpose, a numerical investigation utilising the Eulerian–Eulerian two-fluid model and the RPI wall heat flux partitioning model in OpenFOAM 8.0 is conducted. Initially the parameters comprising the empirical closure relationships used in the RPI sub-models are tuned against the DEBORA experiments on conventional channels, through an extensive sensitivity analysis. In the second part of the investigation, numerical simulations against flow boiling experiments within micro-channels are performed, utilising the previously optimised and validated model setup. Furthermore the importance of including a bubble coalescence and break-up sub-model to capture parameters such as the radial velocity profiles, is also illustrated. However, when the optimal model setup, in conventional tubes, is used against micro-channel experiments, the need to develop new correlations from data obtained from mini and micro-scale channel studies, not from experimental data on conventional channels, is revealed.

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CFD-modelling of boiling in a heated pipe including flow pattern transition

Setoodeh

Shabestary

Ding

et al. 2022

Applied Thermal Engineering

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Modelling and simulation of flow boiling with an Eulerian-Eulerian approach and integrated models for bubble dynamics and temperature-dependent heat partitioning

Cited by 22 publications

References 41 publications

Geometrical investigation of microchannel with two trapezoidal blocks subjected to laminar convective flows with and without boiling

Geometrical investigation of microchannel with two trapezoidal blocks subjected to laminar convective flows with and without boiling

Validation of the Eulerian–Eulerian Two-Fluid Method and the RPI Wall Partitioning Model Predictions in OpenFOAM with Respect to the Flow Boiling Characteristics within Conventional Tubes and Micro-Channels

CFD-modelling of boiling in a heated pipe including flow pattern transition

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