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

Abstract

This study investigates the pressure-drop behaviour associated with airflow through bulk and

Airflow measurement across negatively infiltration processed porous aluminum structures

“…The experimental setup and measurement methods were designed like those reported in Ref. and in brief, in Ref. .…”

“…The measured upstream and downstream gauge pressures were converted to absolute pressures by simply adding the measured gauge pressures with atmospheric pressure . Due to the fractional change in the air as opposed to liquid, care was taken to account for compressibility effects to avoid significant underestimation of the static pressure variation caused by an alteration in the density of the flowing fluid (air) across the foam cross section . Equation was applied to determine the “real” pressure drop ( ΔP ) across the structure as a function of the inlet ( P i ) and outlet ( P 0 ) absolute pressures while P R was taken as reference or atmospheric pressure. …”

“…To ensure that accuracy of the experimental setup in Figure is preserved and the right data were obtained, care was taken to the first test for leak detection and an airflow measurement on a 20 mm thick Inconel 450 μm (metal alloy) foam sample (Figure ) of density and pore volume fraction, 828 kg m −3 and 84%, respectively was carried out and compared to existing data available in the literature . A plot of pressure drops per unit length (Pa m −1 ) against superficial air inlet velocity (m s −1 ) for the Inconel foam structure followed a second‐order Forchheimer relation (Eq. )…”

“…This interconnection in porous metal foam enabled its high porosity, permeability, large foam surface area per unit bulk volume (specific surface) and thermal conductivity which has made it beneficial for use as pressure reduction and heat transfer devices . Understanding the behavior of fluid flow through commercially available porous metallic structures like Porvair, Recemat, Alantum, Alporas, Duocel, and so forth with open porosities between 80 and 95% has been proven experimentally in Ref …”

Computational evaluation of effective transport properties of differential microcellular structures

“…Porous metallic structures are widely classified into open‐celled and close‐celled cellular materials with no moving parts (control pore network and distinctive pore volume) resulting in comparatively simple and less frequent maintenance. While the close‐celled cellular structures are cited to offer high resistance to fluid flow due to their low pore volume, 5‐7 the open‐celled cellular structures are characterized by higher open porosity, random topologies with greater accessible surface area per unit volume or specific surface 8‐10 . Typical applications of porous metallic structures are in the fabrication of reactors, heat exchangers, aero‐engine fuel separators, vibrational and emission control in cars, lightweight solar collectors, fuel cells, and biomedical devices 3,4,6 .…”