The effect of microstructure on the permeability of metallic foams

Pore-Scale Numerical Investigation of Pressure Drop Behaviour Across Open-Cell Metal Foams

“…This result agrees with data from Lee et al (2010), which reports a CT-computed porosity value of 0.8214 for the Inconel 450-µm foam. The total porosity value of 0.8899 for the Recemat NC 1723 computed from the tomographic dataset compares well against total porosity values in the range of 0.89-0.90 reported by Medraj et al (2007), where several samples of the Recemat NC 1723 were analysed. The fraction of unconnected pore space was shown to be generally quite small (<1%) for all foam samples.…”

Tailoring the pressure-drop in multi-layered open-cell porous inconel structures

“…Figure 4 presents the length-normalized pressure drop versus Darcian velocity relationship. As expected, the pressure-drop increases with increasing airflow velocity in similar trends to those reported in [2,4,6,7,[10][11][12][13][14], but a third order (rather than second order) polynomial provides a better fit to the data over the entire velocity range. The different regimes can be identified by using a graphical separation method used by Boomsma et al [11] and adopted in many related works [4,6,9,13,15,16].…”

“…The pressure-drop across monolithic (bulk) porous metals has been widely investigated, including studies reported in [1][2][3][4][5][6]. In many engineering systems, for low (laminar) flow velocities, the relationship between pressure-drop and airflow velocity is ably described by the Hazen-Darcy or Forchheimer equation [3,7,8].…”

“…Among these limited studies it has been shown [3,2] that there is an increase (of up to 33% [3]) in the pressure drop when stacking multiple foam discs, compared with a single disc of the same total thickness. This increase was attributed to the effect of the misalignment and discontinuity in the structure where pores in the different discs might not align, with some pores facing ligaments and solid surfaces [2]. It was also considered that additional entrance effects (air flow disturbance as air goes from a large tube into multiple small channels) might occur because of the gaps between loosely-stacked structures.…”

Representative model and flow characteristics of open pore cellular foam and potential use in proton exchange membrane fuel cells

“…Medraj et al [24] conducted an experimental analysis on the pressure drop across simple structure metallic foams at different velocity ranges using air as the working fluid. They observed that pressure drop characteristics fit the polynomial model of Hazen-Depuit-Darcy where K and C are important values.…”