Experimental validation of simplified conduction–radiation models for evaluation of Effective Thermal Conductivity of open-cell metal foams at high temperatures

Mendes, Miguel A.A.; Skibina, Valeria; Talukdar, Prabal; Wulf, Rhena; Groß, Ulrich; Trimis, D.; Ray, Subhashis

doi:10.1016/j.ijheatmasstransfer.2014.05.058

Cited by 37 publications

(17 citation statements)

References 27 publications

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“…Strategies that go beyond simplified unit cell structures have been explored, for example, by analysing the real foam structure obtained from 3D computed tomography [12] to observe its effects on the ETC. This can support the development of more accurate generic correlations [10,12,18], but is limited by the small volumes of foams that can be investigated in this way. A review of the wide range of theoretical and empirical approaches for porous metals found that each model defines a specific morphology and is hence of limited applicability to other types [11,12,18].…”

Section: Introductionmentioning

confidence: 96%

“…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 TPS element is positioned between two samples with similar characteristics and measures the instantaneous temperature gradient with time [6,25,26]. The main advantages of this approach are that the tests are easy and rapid, and it is possible to measure a wide range of thermal conductivities [6,10]. The analysis can be complex and quantification of uncertainty difficult [10].…”

Section: Introductionmentioning

confidence: 99%

“…The main advantages of this approach are that the tests are easy and rapid, and it is possible to measure a wide range of thermal conductivities [6,10]. The analysis can be complex and quantification of uncertainty difficult [10]. Special care of the thermal contact resistance in terms of surface roughness and contact pressure is required [6].…”

Section: Introductionmentioning

confidence: 99%

“…There are a number of steady state methods which can be used to measure the thermal conductivity [10]. The basic principle of a steady state method is to measure the temperature gradient along a sample length under steady state conditions.…”

Section: Introductionmentioning

confidence: 99%

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The effective thermal conductivity of open cell replicated aluminium metal sponges

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Section: Introductionmentioning

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Section: Introductionmentioning

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The effective thermal conductivity of open cell replicated aluminium metal sponges

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Goodall

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Network‐Based Modeling of Transport Phenomena in Solid and Fluid Phases of Open‐Cell Foams: Construction of Graphs

et al. 2020

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From 3D X‐ray computed images and using iMorph software, two graphs are derived from the solid and fluid networks of open‐cell foams. The graphs are constructed based on the foam structure, which satisfies Plateau's laws. We have defined two types of graphs: 1) the representative graphs of solid and fluid phase networks: The graph of the solid phase is, intuitively, constructed by associating vertices to nodes and edges to struts. For the graph of the fluid phase, vertices are associated with porous cells and edges to throats at the interface of two cells. 2) the coupling graph is related to transfer phenomena between the fluid and solid phases: It is constructed by associating effective edges, which connect a vertex of the solid graph with an adjacent vertex of the fluid graph. The graphs lead to discrete element representation (topology preserving) with geometrical information of the foam structure. Physical variables can be attributed to the discrete objects called cell complex: internal energy to finite volume, heat flux to surface/interface, driving force to edge, and temperature to node. This alternative modeling approach based on graphs is promising for heterogeneous systems with large sizes as it reduces the computational complexity of conventional finite element meshing.

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Effect of meso‐structure characteristics on surface emissivity of 2.5D Woven ablative composite for thermal protection

Liang

Wang

et al. 2023

Polymer Composites

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Surface emissivity is an essential parameter for thermal radiation, which greatly influences thermal protection materials (TPMs) under high temperature. In the present study, dual-scale models of 2.5D woven carbon fiber fabric reinforced resin-based composites are built with different weaving parameters of fabric, to investigate the meso-structure influence on the surface emissivity, and the surface emissivity for different composites is calculated based on discrete ordinate method (DOM). Two morphological indexes are proposed to further analyze the effect of meso-structure characteristics on emissivity. The results show that the surface emissivity is mainly determined by the ablated woven composite within a certain depth. More compact in-plain weaving architecture improves surface emissivity, while more compact through-thethickness weaving architecture reduces the surface emissivity of 2.5D woven ablative composites. The meso-structure with a lower roughness factor and a higher specific surface area leads to intense surface radiation. This study can provide scientific guidance for the design of 2.5D woven ablative composite for thermal protection.

show abstract

Experimental validation of simplified conduction–radiation models for evaluation of Effective Thermal Conductivity of open-cell metal foams at high temperatures

Cited by 37 publications

References 27 publications

The effective thermal conductivity of open cell replicated aluminium metal sponges

The effective thermal conductivity of open cell replicated aluminium metal sponges

Network‐Based Modeling of Transport Phenomena in Solid and Fluid Phases of Open‐Cell Foams: Construction of Graphs

Effect of meso‐structure characteristics on surface emissivity of 2.5D Woven ablative composite for thermal protection

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