The temperature dependence of effective thermal conductivity of open-celled steel alloy foams

Zhao, C.Y.; Lu, Tian Jian; Hodson, H. P.; Jackson, J D

doi:10.1016/j.msea.2003.10.241

Cited by 177 publications

(88 citation statements)

References 16 publications

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“…Their main advantage is their high specific area which enhances the heat transfer and permits miniaturization of the thermal system. Moreover, their geometric construction enhances flow mixing as a result of their tortuous pathways [5,7]. As a result, they have attracted considerable attention in recent times.…”

Section: Introductionmentioning

confidence: 99%

“…The principle process of heat transfer in non-flowing fluid saturated media is conduction through both the solid and fluid phases. However, convection and radiation cannot necessarily be neglected in all cases [7,10]. In such situations, the effective thermal conductivity, ETC, is no longer a property of a single material but depends on both the solid and fluid material properties, and also the structure of the porous medium; e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The porosity ( , the inverse of the amount of solid material) is well defined and easily measured, it only requires that the mass and volume are known. The effective thermal conductivity has been found to be highly sensitive to the porosity, increasing as the porosity decreases [5][6][7][8][13][14][15]. The effect of pore size on ETC is less significant, and generally no noticeable effect of pore size has been reported [5,8,9,15], provided the pore size is below a certain value shown to be 4 mm diameter in closed cell polymer foams which is sufficient to suppress convection [3,16,17].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The effective thermal conductivity of open cell replicated aluminium metal sponges

Abuserwal

Luna

Goodall

et al. 2017

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effective thermal conductivity of open cell replicated aluminium metal sponges

Abuserwal

Luna

Goodall

et al. 2017

International Journal of Heat and Mass Transfer

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“…Note that the fine metal powders are suggested for the slurry because the use of metal powder particles exceeding 25 µm for the slurry often results in structural defects and voids deep within larger foam pieces [5]. Open-cell foams of stainless steel [5], carbonyl iron [5], Fe-Cr-Al [5,10], aluminium [9], titanium [2], Ti-6Al-4V [5,8,11] and molybdenum [5] have been successfully fabricated using the slurry coating method. However, the production of foams for applications involving exposure to high temperature environments requires that superalloys be used as foam materials.…”

Section: Introductionmentioning

confidence: 99%

The effect of slurry composition on the microstructure and mechanical properties of open-cell Inconel foams manufactured by the slurry coating technique

Raghavan

et al. 2017

Materials Science and Engineering: A

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Open-cell nickel-based alloy foams are attractive materials for applications such as sound damping and heat exchange, especially those involving exposure to high temperature environments. This study demonstrated the potential of a developed slurry coating technique for manufacturing open-cell Inconel alloy foams, and then investigated the effect of slurry composition on the microstructure and mechanical properties of the foams. It was found that the compressive properties of the foam can be quantitatively related to its relative density using the empirical equations. The deformation behaviour of the foam is bending-dominated; and unit cell struts undergo brittle fracture after the elastic region. Increasing the slurry solid loading leads to a higher average bulk foam density and more non-uniform crush bands in the foam under compression. Compared to other fabrication processes, this slurry coating technique is able to to produce open-cell Inconel foams with relatively higher strength-to-weight ratios. This study also revealed that the sound absorption capability of the foam increases when its unit cell size is reduced.

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“…Space limitations have led to the use of novel lightweight materials for improving the thermal management applications. High porosity open-cell metal foam ( ε 0.85 ) has been widely used as one of the most promising materials due to its diverse properties such as high surface area to volume ratio, tortuous flow path to promote mixing, and attractive stiffness-strength properties (Zhao et al, 2004;Boomsma et al, 2003;Lu, et al,1998). These attractive properties of metal foams have directed researchers to the new class of compact heat exchangers commonly known as foam heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

Estimation of effective thermal conductivity enhancement using foam in heat exchangers based on a new analytical model

Haghighi

Kasiri

2010

Braz. J. Chem. Eng.

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-Thermal performance of open-cell metal foam has been investigated under low Reynolds number by comparing the heat transfer coefficient and thermal conductivity for the flow through a packed channel of high porosity metal foam to that of an open channel. In the case of Al-Air at porosity 0.971, the ratio of heat transfer coefficients is estimated to be 18.5 when the thermal conductivity ratio of foam matrix to fluid conductivity is 130. This demonstrates that the use of foam in the structure of conventional air coolers increases effective thermal conductivity, heat transfer coefficient and thermal performance considerably. To overcome the drawbacks of previous models, a new model to describe the effective thermal conductivity of foam was developed. The model estimates effective thermal conductivity based on a non-isotropic tetrakaidecahedron unit-cell and is not confined only to isotropic cases as in previous models. Effective thermal conductivity is a function of foam geometrical characteristics, including ligament length (L), length of the sides of horizontal square faces (b), inclination angle that defines the orientation of the hexagonal faces with respect to the rise direction (θ), porosity, size, shape of metal lump at ligament intersections and heat transfer direction. Changing dimensionless foam ligament radius or height (d) from 0.1655 to 0.2126 for Reticulated vitreous foam -air (RVC-air) at θ= π 4 and dimensionless spherical node diameter (e) equal to 0.339 raises effective thermal conductivity by 31%. Moreover, increasing θ from π 4 to 0.4π for RVC-air at d=0.1655 and e=0.339 enhances effective thermal conductivity by 33%.

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The temperature dependence of effective thermal conductivity of open-celled steel alloy foams

Cited by 177 publications

References 16 publications

The effective thermal conductivity of open cell replicated aluminium metal sponges

The effective thermal conductivity of open cell replicated aluminium metal sponges

The effect of slurry composition on the microstructure and mechanical properties of open-cell Inconel foams manufactured by the slurry coating technique

Estimation of effective thermal conductivity enhancement using foam in heat exchangers based on a new analytical model

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