Estimation of effective thermal conductivity in open-cell foam with hierarchical pore structure using lattice Boltzmann method

Lin, Yixiong; Yang, Chen; Zhang, Wei; Fukumoto, Kazui; Saito, Yasuhiro; Machida, Hiroshi; Norinaga, Koyo

doi:10.1016/j.applthermaleng.2022.119314

Cited by 24 publications

(4 citation statements)

References 76 publications

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“…Therefore, for the sake of simplicity, the triangle cross‐section of the ligament structure is reconstructed discretely in the 2D domain to simulate the liquid water‐air flow process, which is consistent with the previous studies 48–51 . Based on our previous study, 52 the reconstructed procedure for foam structure is conducted in 2D: (i) randomly generate a packing structure for two types of circles by the discrete element method, where the numbers of two types of circles with different diameters (

d_{fine}

and

d_{coarse}

) are calculated based on

V_{coarse} / V_{fine}

, respectively. (ii) get the coordinates of each circle's core and draw the 2D Voronoi diagram.…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

“…Therefore, for the sake of simplicity, the triangle crosssection of the ligament structure is reconstructed discretely in the 2D domain to simulate the liquid water-air flow process, which is consistent with the previous studies. [48][49][50][51] Based on our previous study, 52 the reconstructed procedure for foam structure is con- structures but also foam with hierarchical pore structure. The reconstructed foam structure in 2D was shown in Figure 3, where the white and black areas are the pore and ligament structure, respectively.…”

Section: Computational Domain and Boundary Conditionsmentioning

confidence: 99%

See 1 more Smart Citation

Liquid water discharge capability enhancement of hierarchical pore structure in metal foam flow field of proton exchange membrane fuel cell

Lin,

Sun,

Yang

et al. 2023

AIChE Journal

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Metal foam flow field shows great potential for next‐generation proton exchange membrane (PEM) fuel cell of high power density due to its well‐connected pore structure, high thermal and electrical conductivity. However, the complicated pore structure makes it a challenge for water management. To tackle this issue, a novel design of metal foam flow field with hierarchical pore structure was proposed. Based on lattice Boltzmann method (LBM), the structure‐performance relationship between hierarchical pore structure and water discharge capability of flow field was explored by using breakthrough time. Furthermore, an optimal hierarchical pore structure for metal foam flow field that shows superior water discharge capability was obtained. Compared with metal foam with uniform coarse pore structure, breakthrough time can be reduced roughly by 17.6% in the one with optimal hierarchical pore structures. This finding provides a theoretical foundation and technical guidance for developing metal foam flow field.

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d_{fine}

and

d_{coarse}

) are calculated based on

V_{coarse} / V_{fine}

, respectively. (ii) get the coordinates of each circle's core and draw the 2D Voronoi diagram.…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

Section: Computational Domain and Boundary Conditionsmentioning

confidence: 99%

Liquid water discharge capability enhancement of hierarchical pore structure in metal foam flow field of proton exchange membrane fuel cell

Lin,

Sun,

Yang

et al. 2023

AIChE Journal

Self Cite

View full text Add to dashboard Cite

show abstract

“…Several idealized geometric models, including cubic models [34,35], face-centered models, body-centered models [36], and Kelvin's tetrakaidecahedral model [37,38], have been utilized to numerically investigate the pressure drop and heat transport characteristics. To construct hierarchical pore structure for open-cell foam, Lin et al [39] proposed a novel numerical algorithm capable of constructing both uniform and hierarchical pore structures. Four parameters are used to control the algorithm, which are porosity (ε), fine pore size (d 1 ), the ratio of the coarse pore size to the fine pore size (d 2 =d 1 ), and the ratio of the coarse pore volume to the fine pore volume (V 2 =V 1 ).…”

Section: Reconstruction Of Open-cell Foam With Hierarchical Pore Stru...mentioning

confidence: 99%

Enhancement of mass transfer and coke resistance in DRM through hierarchical porous catalysts

Lin,

Yang,

Qiu

2024

Transport Perspectives for Porous Medium Applications

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Dry reforming of methane (DRM) is one of the feasible strategies for carbon capture and utilization. However, DRM has a high tendency toward coking, which is restricted to industrial applications. The primary cause of coking in DRM is the limitation of mass transfer inside porous catalysts. To overcome this limitation, optimizing the pore structure of the porous catalyst becomes crucial. Hierarchical pore structure has received considerable attention in recent years due to its superior mass transfer performance. Therefore, this chapter focuses on the structure-performance relationship of hierarchical porous catalysts in DRM. Specifically, two types of porous catalysts, namely porous pellet and open-cell foam, are examined. The impacts of various hierarchical pore structure parameters on the catalytic activity and coke resistance are investigated. The findings offer a theoretical foundation and technical guidance for the design of porous catalysts with hierarchical pore structures.

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“…In the last decade, many novel research studies have predicted the ETC. Wang et al [21], Alessandro Tugnoli et al [22], Tian Xiao et al [23], Wang et al [24], Mendes et al [25], and Yixiong Lin et al [26] proposed microscopic models of random generation and proposed a method to evaluate ETC. Wei et al [27], Bi et al [28], and Farahani, M. V. et al [29] conducted a mechanistic study on pore-scale mechanisms in partially saturated porous media.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Effective Thermal Conductivity of Fibrous Porous Materials as Vacuum Insulation Panels’ Core Using Lattice Boltzmann Method

et al. 2023

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Vacuum Insulation Panels (VIPs) provide significant adiabatic performance for heat/cooling systems to reduce energy consumption. The application of fibrous porous material (FPM) as the ideal core of VIPs has gained global attention in recent decades. The microstructure and physical properties of FPMs, filled as novel VIPs’ core material, and holding superior thermal performance, affected effective thermal conductivity (ETC) greatly. Aiming to deeply understand heat transfer mechanisms, a holistic simulation method that combined with a developed 3D FPM structure generation method and a D3Q15-Lattice Boltzmann method (LBM) is proposed to simulate the heat transfer in FPM and to illuminate the influence factors of ETC on the microstructure of FPM in a vacuum. The improved and modified mesoscopic 3D fibrous random micro-structure generation approach involved five structural parameters: generation probability of nucleus growth, fiber length, diameter, coincidence rate, and orientation angle. The calculation model of ETC is established, and the discrete velocity, distribution, evolution, and boundary conditions of D3Q15-LBM are invested in detail. The model is validated with influences of different microstructure parameters. It indicated that FPM with finer diameter, smaller average pore size, and bigger orientation angle easily gain the lower ETC in a vacuum. The ETC was also affected by the orientation angles of fibers. The more the heat transfer direction is inconsistent with the length direction of the fiber, the better the adiabatic performance is. The reliability of the model is verified by comparison, and this work is a reference to optimize the fibrous core of VIPs.

show abstract

Estimation of effective thermal conductivity in open-cell foam with hierarchical pore structure using lattice Boltzmann method

Cited by 24 publications

References 76 publications

Liquid water discharge capability enhancement of hierarchical pore structure in metal foam flow field of proton exchange membrane fuel cell

Liquid water discharge capability enhancement of hierarchical pore structure in metal foam flow field of proton exchange membrane fuel cell

Enhancement of mass transfer and coke resistance in DRM through hierarchical porous catalysts

Investigation on Effective Thermal Conductivity of Fibrous Porous Materials as Vacuum Insulation Panels’ Core Using Lattice Boltzmann Method

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