Coupled lattice Boltzmann finite volume method for conjugate heat transfer in porous media

Chiappini, Daniele; Festuccia, Alessio; Bella, Gino

doi:10.1080/10407782.2018.1444868

Cited by 30 publications

(5 citation statements)

References 47 publications

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“…The second application which has been implemented and analysed is the injection in a porous domain. As already stated in §2d, the porous domain has been modelled through the random packing spheres approach, widely used to characterize fluid dynamics of open-cell metal foams [38,69,71]. With respect to metal foam characteristics two main quantities are generally needed for their characterization: the porosity ϵ , which represents the ratio between air and metal volumes, and the PPI distribution, which gives information about the number of pores present in a linear inch [72,73].…”

Section: Resultsmentioning

confidence: 99%

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A lattice-Boltzmann free surface model for injection moulding of a non-Newtonian fluid

Chiappini

2020

Phil. Trans. R. Soc. A.

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The aim of this work is to present a lattice Boltzmann (LB) model devoted to dealing with non-Newtonian free surface flow. The combination of LB solver with a free-surface model allows dealing with multiphase flows where the density ratio in between the two considered phases is so high that the lighter phase can be neglected. For this particular set of multiphase models, the interface between the two phases is numerically reconstructed and transported via a diffusion equation. Moreover, the application of a Carreau approach for viscosity modelling allows the introduction of effects related to shear stress on fluid flow evolution. Two different non-Newtonian silicon-like materials have been considered here, namely the polystyrene and acrylonitrile butadiene styrene. Here, the author, after the mandatory model validation with a reference configuration, presents some applications of injection moulding for two different test-cases: the former is the injection in a labyrinth-like gasket, whereas the latter is the injection in a porous media. This article is part of the theme issue ‘Fluid dynamics, soft matter and complex systems: recent results and new methods’.

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Section: Resultsmentioning

confidence: 99%

“…In this work, the porous medium generation is based on the random packing spheres approach proposed by Al-Raoush & Alsaleh [38] and already analysed for thermal simulations in [69]. The computational domain is initially filled by a metal box; the area hollowed by every circle represents the vacuum where air/polymer can pass through.…”

Section: Numerical Modelmentioning

confidence: 99%

A lattice-Boltzmann free surface model for injection moulding of a non-Newtonian fluid

Chiappini

2020

Phil. Trans. R. Soc. A.

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“…On the other hand, theoretical analysis is limited to simple geometry structures and idealized flow situations, and such conditions can hardly be satisfied in realistic systems. Fortunately, with the advances in computer and software technologies, numerical simulations have been proved to be useful for various complex systems, including flows and heat transfer in porous media [12][13][14][15][16]. In the literature, there exist two typical approaches for modeling the flow and heat transfer in porous media: the continuum and the pore-scale approaches.…”

Section: Introductionmentioning

confidence: 99%

Effects of Microscopic Properties on Macroscopic Thermal Conductivity for Convective Heat Transfer in Porous Materials

Jbeili

Zhang

2021

Micromachines

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Porous materials are widely used in many heat transfer applications. Modeling porous materials at the microscopic level can accurately incorporate the detailed structure and substance parameters and thus provides valuable information for the complex heat transfer processes in such media. In this study, we use the generalized periodic boundary condition for pore-scale simulations of thermal flows in porous materials. A two-dimensional porous model consisting of circular solid domains is considered, and comprehensive simulations are performed to study the influences on macroscopic thermal conductivity from several microscopic system parameters, including the porosity, Reynolds number, and periodic unit aspect ratio and the thermal conductance at the solid–fluid interface. Our results show that, even at the same porosity and Reynolds number, the aspect ratio of the periodic unit and the interfacial thermal conductance can significantly affect the macroscopic thermal behaviors of porous materials. Qualitative analysis is also provided to relate the apparent thermal conductivity to the complex flow and temperature distributions in the microscopic porous structure. The method, findings and discussions presented in this paper could be useful for fundamental studies, material development, and engineering applications of porous thermal flow systems.

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“…The arrangement with partially wrapped tubes caused the same heat transfer rate respect to the system totally filled; at the same time, the pressure drop was reduced of 60%, the surface factor increased by 33% and the quantity of the use of foam decreased by 50%. Chiappini et al [19] used a coupled lattice Boltzmann finite volume method in order to investigate the conjugate heat transfer in a porous medium. The system under investigation was a heat exchanger with open-cell metal foam.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Thermal and Fluid Dynamic Behavior of a Compact Heat Exchanger Partially Filled with Metal Foam

Buonomo¹,

Pasqua²

2019

IJES

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Designers of heat exchangers are regularly searching for new methods that enhance the heat transfer efficiency. A possible substitute of the conventional fins is the use of open-cell metal foams. Low density, good rigidity, high thermal conductivity and huge value of surface/volume ratio represent the best characteristics of porous media. For these features, metal foams are used in several applications such as heat exchangers, fuel cells, heat sinks and solar thermal plants. The need to create new systems in reduced volumes led to the adoption of the aluminum foams for their great specific area surface that allows to have compact heat exchanger characterized by a high thermal performance. A numerical investigation has been accomplished to analyze the thermal and fluid dynamic behavior of a tubular heat exchanger partially filled with aluminum foam. The Darcy-Brinkman-Forchheimer flow model and the thermal non-equilibrium model (LTNE) for the energy are applied to carry out two-dimensional simulations on the metal foam heat exchanger. The foam has a porosity and (number) pores per inch respectively equal to 0.935 and 20. The heat exchanger is analyzed for different air flow rates and a fixed surface tube temperature. The results are given as average and local heat transfer coefficient evaluated on the external surface of the tubes. Furthermore, the local air temperature profiles in the smaller cross section, between two consecutive tubes are given. Finally, the Energy Performance Ratio (EPR) is evaluated in order to demonstrate the thickness of metal foam that improve the system performances.

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Coupled lattice Boltzmann finite volume method for conjugate heat transfer in porous media

Cited by 30 publications

References 47 publications

A lattice-Boltzmann free surface model for injection moulding of a non-Newtonian fluid

A lattice-Boltzmann free surface model for injection moulding of a non-Newtonian fluid

Effects of Microscopic Properties on Macroscopic Thermal Conductivity for Convective Heat Transfer in Porous Materials

Numerical Study on Thermal and Fluid Dynamic Behavior of a Compact Heat Exchanger Partially Filled with Metal Foam

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