Aluminum foam

Aluminum foam can be used as a porous medium in the model of a heat sink with inner heat generation (Hetsroni et al. 2006a). Open-cell metal foam has a good effective thermal conductivity and a high specific solid-fluid interfacial surface area. 

Depending on the metal foam configuration, its specific surface area varies from 500 for original foam to 10,000 m /m for compressed foam. Aluminum foam of 40 pores per inch (ppi) was studied. The structure of the porous material is presented in Fig. 2.77. 

Fig. 2.77a,b Sample of aluminum foam. Reprinted from Hetsroni et al. (2006a) with permission... 

Figure 9.2 Fiber and foam structures, (a) Knitted silica fibers catalyst. (Reprinted from [7].) (b) Woven active carbon fiber catalyst. (Reprinted from [8].) (c) Aluminum foam. (Reprinted from [9].)...

FIGURE 25 Image of alumina washcoat on aluminum foam. Left closeup SEM left, aluminum middle, anodized layer (aluminum oxide, about 5 pm thick) right, washcoat (20 pm thick). Right image piece of solid foam from which part of the washcoat had been removed (broken off), thus showing the washcoat layer. 

Hou, W.H., Zhu, F., Lu, G.X., and Fang, D.N. (2010) Ballistic impact experiments of metallic sandwich panels with aluminum foam core. International Journal of Impact Engineering, 37, 1045-1055. 

How is aluminum foam made Two layers of aluminum sheet and a middle powder layer (made of titanium metal hydride and aluminum powder) are... 

Not only is the new aluminum foam part much lighter than its steel counterpart it also performs well in crash tests. One of these da) you may climb into a car that is really a foam colloid— with great fuel economy and crash resistance. 

Figure 12.23 Examples of structured packing (a) open cross flow structure (OCFS), (b) dosed cross flow structure (CCFS), (c) knitted wire, and (d) aluminum foam [117].

Figure 29.4a shows the porosity dependence of the stress-strain curves of the aluminum foams with a relative density of 14.6-48.5 %, where the pore size is between 1.6 and 2.0 mm. If the foam density was high, then the constant-stress plateau was short. On the other hand, foam of lower density exhibited a longer, flatter plateau because the structure affords more opportunity for cell walls to collapse and deform [50]. Foams with smaller pore sizes should follow the same trend of hardness change in smaller ligands. 

B. Jiang, Z.J. Wang, N.Q. Zhao, Effect of pore size and relative density on the mechanical properties of open cell aluminum foams. Scr. Mater. 56(2), 169-172 (2007)... 

The use of the electric field has been proposed and demonstrated to perform very well in defining various other properties. For example, electrical measurements have been used to monitor the foaming process and polymerization of polymeric foams [74], while dielectric measurements have been used for measuring the density of polymer foams [75]. Brady et al. [76] developed electrically conductive polypyrrole-coated PUR foam. The conductance of the foam was found to change linearly with the compressive load applied single and repeated. For aluminum foams, Kim et al. [77] developed a set of mathematical relationships based on experimental data to obtain mechanical properties (elastic modulus, compressive strength, and densification strain), using electrical conductivity as a non-destructive inspection method. 

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