The thermal non-equilibrium porous media modelling for CFD study of woven wire matrix of a Stirling regenerator

Costa, S.; Barreno, I.; Tutar, Mustafa; Esnaola, J.A.; Barrutia, Haritz

doi:10.1016/j.enconman.2014.10.019

Cited by 54 publications

(12 citation statements)

References 7 publications

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“…In the multi-D analysis, the regenerator is frequently modelled using the porous media approach [20], [28] [30], [31]. The main physical phenomena to be considered in the characterization of the regenerator are the flow friction and the heat transfer [35].…”

Section: Regenerator Equationsmentioning

confidence: 99%

CFD Simulation and Losses Analysis of a Beta-Type Stirling Engine

Mikhael

El-Ghandour

El-Ghafour

2018

Port-Said Engineering Research Journal

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A three-dimensional Computational Fluid Dynamics (CFD) simulation for the beta-type Stirling engine is performed. Firstly, a thorough characterization of the thermal and fluid flow fields during the cycle is presented. Secondly, a comprehensive energy analysis for the engine is conducted to accurately identify the sources and magnitudes of thermodynamic losses. Computational results show a close agreement with the experimental results with an accuracy of about 96%. Within the compression and expansion spaces, the dominant heat transfer rates occur during the expansion strokes due to the significant impinging effect of the tumble vortices generated from the flow jetting. Furthermore, the jetting and ejecting processes into the regenerator is characterized by a significant temperature gradient and a large matrix temperature oscillation. The pressure difference between the expansion and compression spaces is the main driver for the flow leakage through the appendix gap. From the energy analysis, the regenerator thermal loss and the pumping power represent the largest part of the Stirling engine losses by about 9.2% and 7.5%, respectively.

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Section: Regenerator Equationsmentioning

confidence: 99%

CFD Simulation and Losses Analysis of a Beta-Type Stirling Engine

Mikhael

El-Ghandour

El-Ghafour

2018

Port-Said Engineering Research Journal

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“…The second approach defines the matrix as a porous block with a porosity that enables to simulate the flow behavior of the actual geometry. This approach is used in the literature to study heat exchangers [9], and, more specifically, is employed for the Stirling engine regenerator [1,10,11].…”

Section: Introductionmentioning

confidence: 99%

A Porous Media Numerical Approach for the Simulation of Stirling Engine Regenerators

Faruoli¹,

Viggiano²,

Magi³

2019

IJES

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The Stirling engine design process is mostly focused on the study of the engine regenerator, whose thermal efficiency is strictly related to the global efficiency of the engine. The present work aims to setup a numerical model by means of OpenFOAM libraries to simulate the engine regenerator as a porous media, in order to reduce the overall computational cost of the simulations and to obtain a suitable model that can be eventually used for topological optimization. The solid part of the numerical domain, i.e. the stoked wires, is represented as a zone with the highest porosity, whereas intermediate areas are defined in order to simulate the boundary layers in proximity of the walls. The presence of porous media is modelled by introducing a Darcy-type pressure drop in the momentum equation, whereas in the energy equation the thermal properties of the solid, intermediate and fluid materials are modelled by means of a linear function of the porosity value in the domain. After a process of tuning, the results obtained with this model are reported for different flow conditions in terms of both aerodynamic and thermal performances, thus showing a good agreement with the numerical results obtained with a more classical CFD methodology.

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“…Then, in Ref. [6], they carried out a study of the same configuration as porous media. In [7][8][9] the complete engine working process is simulated together with the regenerator performance and both friction coefficient and thermal heat have been evaluated.…”

Section: Introductionmentioning

confidence: 99%

An investigation of thermo-fluid dynamic performance of a Stirling engine regenerator by means of OpenFOAM

Faruoli¹

2018

MMC_B

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A good design of the regenerator of a Stirling engine is required to obtain high performance and efficiency of such an engine. The regenerator is basically a heat-exchanger placed between the hot and cold working streams. It usually consists of stacked woven wires. The fluid pressure drop and heat transfer are the main parameters of the regenerator influencing the engine performance. In this work, friction coefficient, thermal efficiency and Nusselt number are numerically evaluated in order to assess the performance of the regenerator. The open-source software OpenFOAM is used to analyse the thermo-fluid dynamic behaviour of a regenerator wire netting at different Reynolds numbers. Firstly, isothermal air flows and adiabatic wire matrices are considered, by assuming the fluid flowing through the regenerator as incompressible. Then, air flows with a fluid temperature of 500 K and wires at a temperature of 300 K are analysed. The results are compared with those obtained by means of the commercial software Ansys Fluent.

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The thermal non-equilibrium porous media modelling for CFD study of woven wire matrix of a Stirling regenerator

Cited by 54 publications

References 7 publications

CFD Simulation and Losses Analysis of a Beta-Type Stirling Engine

CFD Simulation and Losses Analysis of a Beta-Type Stirling Engine

A Porous Media Numerical Approach for the Simulation of Stirling Engine Regenerators

An investigation of thermo-fluid dynamic performance of a Stirling engine regenerator by means of OpenFOAM

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