A model for the conduction shape factor in spherical void phase porous materials

Fleet, Cole T.; Straatman, Anthony G.

doi:10.1016/j.ijheatmasstransfer.2020.120583

Cited by 7 publications

(5 citation statements)

References 40 publications

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“…The variation in pore structure factors in the design of porous materials has increasingly intrigued scholars. Currently, three structural factors of pore shape, size, and interval have been studied in the fields of mechanics [7], thermal conductivity [8,9], sound absorption [10], and gas adsorption [11]. However, few reports have explored the effect of various pore structures on combustion performance-this is a significant gap in the literature, which this study aims to fill.…”

Section: Introductionmentioning

confidence: 99%

Combustion Performance of Various Polylactic Acid Plastics with Different Porous Structures Constructed by 3D Printing

Yuan,

Wang

2023

Fire

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Polylactic acid (PLA) has intrigued widespread attention as a biodegradable and environmentally friendly polymer, and recent research has revealed that the use of porous PLA in heat sinks for thermal management materials offers promising development potential. However, the heat transfer performance is closely related to its structure theoretically, whether it is virgin, and how the pore structure affects its heat transfer. Therefore, a novel approach is proposed to address this issue by preparing porous PLA through 3D printing at low complexity and cost, the combustion performance is employed to evaluate the heat transfer indirectly, and the higher burning speed represents higher efficient heat transfer. A new framework is developed to investigate combustion performance and three series of PLA with different pore structures in pore shape, size, and interval are studied by combining experimental tests, respectively. It demonstrates that adjusting the pore structure of PLA significantly alters its combustion performance, evidenced by significant variations in flame growth index, which are 83% better for the 2 mm holes than the largest holes and 71% better for the 2 mm interval than for the sparsest pore structure. Generally, it provides some experimental basis for designing porous thermal management materials; the various pore structures generate different combustion performances, corresponding to various heat transfer.

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Section: Introductionmentioning

confidence: 99%

Combustion Performance of Various Polylactic Acid Plastics with Different Porous Structures Constructed by 3D Printing

Yuan,

Wang

2023

Fire

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“…These simulations can be used to obtain integral quantities characterizing the resistance to fluid passage, convective exchange and thermal dispersion, all of which are required for analogous simulations conducted using the volume-averaged (porous-continuum) approach. In addition to flow resistance and interstitial heat exchange, accurate information must be provided to characterize the solid phase conduction, which because of the complex shape, is a function of both solid-phase conductivity and a conduction shape factor, which characterizes the departure of the conduction path from being straight and of uniform cross-section [5][6].In the present study, spherical-void-phase representative elemental volumes developed using the Discrete Element approach described in Dyck & Straatman [7] were produced over the range of porosities 0.70 ≤ ε ≤ 0.85 and for pore diameters of 400 µm and 800 µm. Simulations of conduction-only through the solid domain were then conducted using the commercial software CFX to establish conduction shape factors using the approach of Fleet and Straatman [6].…”

mentioning

confidence: 99%

“…In addition to flow resistance and interstitial heat exchange, accurate information must be provided to characterize the solid phase conduction, which because of the complex shape, is a function of both solid-phase conductivity and a conduction shape factor, which characterizes the departure of the conduction path from being straight and of uniform cross-section [5][6].In the present study, spherical-void-phase representative elemental volumes developed using the Discrete Element approach described in Dyck & Straatman [7] were produced over the range of porosities 0.70 ≤ ε ≤ 0.85 and for pore diameters of 400 µm and 800 µm. Simulations of conduction-only through the solid domain were then conducted using the commercial software CFX to establish conduction shape factors using the approach of Fleet and Straatman [6]. Simulations of conjugate heat transfer were also conducted to provide validation for similar simulations conducted using the porous continuum (volume-averaged) approach.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

“…In the present study, spherical-void-phase representative elemental volumes developed using the Discrete Element approach described in Dyck & Straatman [7] were produced over the range of porosities 0.70 ≤ ε ≤ 0.85 and for pore diameters of 400 µm and 800 µm. Simulations of conduction-only through the solid domain were then conducted using the commercial software CFX to establish conduction shape factors using the approach of Fleet and Straatman [6]. Simulations of conjugate heat transfer were also conducted to provide validation for similar simulations conducted using the porous continuum (volume-averaged) approach.…”

mentioning

confidence: 99%

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The Impact Of Conduction Shape Factor In Volume Averaged Calculations Of Heat Transfer In Permeable Porous Materials

Straatman¹,

Fleet²

2022

Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering

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Porous materials like metal and graphitic foams are seeing increased use in heat transfer devices due to their high solidphase conductivity and area-to-volume ratios. The internal structures of these materials can be extremely complex, but accurate characterization of the foam properties in terms of permeability, inertial losses, interstitial exchange and effective conductivity are critical for being able to consider such materials in design and application. Recent literature exists for characterizing permeable porous materials by conducting pore-level simulations on idealized geometric models [1-2] or geometric models generated by scanning samples of the porous media [3][4]. In such cases, a given geometric structure is discretized and simulations are conducted to obtain direct solutions to the mass, momentum and energy equations under laminar or turbulent flow conditions. These simulations can be used to obtain integral quantities characterizing the resistance to fluid passage, convective exchange and thermal dispersion, all of which are required for analogous simulations conducted using the volume-averaged (porous-continuum) approach. In addition to flow resistance and interstitial heat exchange, accurate information must be provided to characterize the solid phase conduction, which because of the complex shape, is a function of both solid-phase conductivity and a conduction shape factor, which characterizes the departure of the conduction path from being straight and of uniform cross-section [5][6].In the present study, spherical-void-phase representative elemental volumes developed using the Discrete Element approach described in Dyck & Straatman [7] were produced over the range of porosities 0.70 ≤ ε ≤ 0.85 and for pore diameters of 400 µm and 800 µm. Simulations of conduction-only through the solid domain were then conducted using the commercial software CFX to establish conduction shape factors using the approach of Fleet and Straatman [6]. Simulations of conjugate heat transfer were also conducted to provide validation for similar simulations conducted using the porous continuum (volume-averaged) approach. The volume-averaged simulations were conducted using an in-house, conjugate domain, thermal non-equilibrium CFD code described in Betchen et al. [8], but modified to include the conduction shape factor (F). The simulations including F are shown to be in excellent agreement across the full range of heating and Re D considered. The results also show that without including F, the volume-averaged simulations over-predict the heat transfer by as much as 40% owing to the over-estimation of the effective solid-phase conductivity. Of important note is that porelevel calculations of conjugate heat transfer require more than 25 times the CPU effort compared to those conducted using the volume-averaged approach with F, which illustrates the important utility of volume-averaged heat transfer calculations in porous materials.

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Numerical study to investigate the thermal characteristic length with coupled CFD-FEM simulations

Szűcs

2024

International Journal of Heat and Fluid Flow

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A model for the conduction shape factor in spherical void phase porous materials

Cited by 7 publications

References 40 publications

Combustion Performance of Various Polylactic Acid Plastics with Different Porous Structures Constructed by 3D Printing

Combustion Performance of Various Polylactic Acid Plastics with Different Porous Structures Constructed by 3D Printing

The Impact Of Conduction Shape Factor In Volume Averaged Calculations Of Heat Transfer In Permeable Porous Materials

Numerical study to investigate the thermal characteristic length with coupled CFD-FEM simulations

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