A Unit Cube-Based Model for Heat Transfer and Fluid Flow in Porous
                    Carbon Foam

Yu, Qihui; Thompson, Brian E.; Straatman, Anthony G.

doi:10.1115/1.2165203

Cited by 93 publications

(45 citation statements)

References 23 publications

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“…Yu et al [31], and Krishnan et al [33] have developed numerical solutions for fluid flow and convection heat transfer using idealized pore level models. Yu et al [31] used a cubic cell geometry to determine the interior surface area, and developed analytical expressions for the effective thermal conductivity and convective heat transfer. Karimian and Straatman [34,35] followed up this study by numerically solving the fluid flow and heat transfer for the same body centered cubic cell geometry.…”

Section: Idealized Pore-level Modelmentioning

confidence: 99%

“…2c, d). Yu et al [31] used a pore at the center of a cubic cell to form the model. A tetrakaidecahedral unit cell for carbon foam was used by Li et al [32].…”

Section: Idealized Pore-level Modelmentioning

confidence: 99%

“…Using these idealized pore models, it is possible to determine the surface area and the thermal conductivity analytically [31,48], or by numerical analysis.…”

Section: Idealized Pore-level Modelmentioning

confidence: 99%

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Computational Model of Porous Media Using True 3-D Images

Alam

Anghelescu

Bradu

2010

Advanced Structured Materials

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Thermally conductive foams are being developed for many engineering applications; and there is a need to develop analytical models to predict the thermal properties of such porous media. Most of the current models are based on volume averaging techniques, and often assume simple, ideal shapes for the pore geometry. The method described in this chapter focuses on modeling the thermal and flow properties of foams on the basis of its true microstructure. The approach is to take a three dimensional solid model of a real foam, obtained by imaging techniques, and use it as the basis for the numerical solution of the transport phenomena. This is a micro-model, in which the thermal phenomena are modeled at the pore level of the foam. The model is computationally intensive, as can be expected; but it does not require semi-empirical or experimentally derived constants such as permeability to derive a solution. By incorporating the effect of the true pore geometry on the thermal transport and fluid flow in the foam, this model is able to determine the thermal conductivity, permeability, friction factor and heat transfer coefficients. Graphitic carbon and silicon carbide foams are used in this study, but the approach that is described is quite general and can be applied to other porous media; it may also be applied to composites that contain phases with distinct boundaries at the micro-level.

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Section: Idealized Pore-level Modelmentioning

confidence: 99%

“…2c, d). Yu et al [31] used a pore at the center of a cubic cell to form the model. A tetrakaidecahedral unit cell for carbon foam was used by Li et al [32].…”

Section: Idealized Pore-level Modelmentioning

confidence: 99%

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Computational Model of Porous Media Using True 3-D Images

Alam

Anghelescu

Bradu

2010

Advanced Structured Materials

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“…In order to achieve high thermal conductivity in the graphite crystal, the structure must be comprised of aligned, straight grapheme planes, and so on. On the other hand, Yu et al [5] presented a model which was based on sphere -centered and interconnected unit cubes. The effective thermal conductivity was proved to be a function of the porosity of the graphite foam.…”

Section: Thermal Properties Of Graphite Foammentioning

confidence: 99%

Review on Graphite Foam as Thermal Material for Heat Exchangers

Lin¹,

Yuan²,

Sundén³

2011

Linköping Electronic Conference Proceedings

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Due to the increased power consumptions in equipment, the demand of effective cooling methods becomes crucial. Because of the small scale spherical pores, graphite foam has huge specific surface area. Furthermore, the thermal conductivity of graphite foam is four times that of copper. The density of graphite foam is only 20 % of that of aluminum. Thus, the graphite foam is considered as a novel highly -conductive porous material for high power equipment cooling applications. However, in the commercial market, aluminum and copper are still the preferred materials for thermal management nowadays. In order to promote the graphite foam as a thermal material for heat exchangers, an overall understanding of the graphite foam is needed. This paper describes the structure of the graphite foam. Based on the special structure, the thermal properties and the flowing characteristics of graphite foam are outlined and discussed. Furthermore, the application of graphite foam as a thermal material for heat exchangers is highlighted for electronic packages and vehicle cooling systems. The physical problems and other aspects, which might block the development of graphite foam heat exchangers, are pointed out. Finally, several useful conclusions and suggestions are given to promote the development of graphite foam heat exchangers.

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“…The theoretically calculated ligament thermal conductivity values (k Solid ), as well as the polymer thermal conductivity (k Polymer ), is used in a normalized unit cube model developed by Yu et al 27 (Equation (2)) to calculate the bulk composite thermal conductivity (k Bulk )…”

mentioning

confidence: 99%

Thermal conductivity enhancement of laser induced graphene foam upon P3HT infiltration

Smith

Luong

Bougher

et al. 2016

Applied Physics Letters

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Significant research has been dedicated to the exploration of high thermal conductivity polymer composite materials with conductive filler particles for use in heat transfer applications. However, poor particle dispersibility and interfacial phonon scattering have limited the effective composite thermal conductivity. Three-dimensional foams with high ligament thermal conductivity offer a potential solution to the two aforementioned problems but are traditionally fabricated through expensive and/or complex manufacturing methods. Here, laser induced graphene foams, fabricated through a simple and cost effective laser ablation method, are infiltrated with poly(3-hexylthiophene) in a step-wise fashion to demonstrate the impact of polymer on the thermal conductivity of the composite system. Surprisingly, the addition of polymer results in a drastic (250%) improvement in material thermal conductivity, enhancing the graphene foam's thermal conductivity from 0.68 W/m-K to 1.72 W/m-K for the fully infiltrated composite material. Graphene foam density measurements and theoretical models are utilized to estimate the effective ribbon thermal conductivity as a function of polymer filling. Here, it is proposed that the polymer solution acts as a binding material, which draws graphene ligaments together through elastocapillary coalescence and bonds these ligaments upon drying, resulting in greatly reduced contact resistance within the foam and an effective thermal conductivity improvement greater than what would be expected from the addition of polymer alone. Published by AIP Publishing. [http://dx

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A Unit Cube-Based Model for Heat Transfer and Fluid Flow in Porous Carbon Foam

Cited by 93 publications

References 23 publications

Computational Model of Porous Media Using True 3-D Images

Computational Model of Porous Media Using True 3-D Images

Review on Graphite Foam as Thermal Material for Heat Exchangers

Thermal conductivity enhancement of laser induced graphene foam upon P3HT infiltration

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