Pore-scale numerical investigation of pressure drop behaviour across open-cell metal foams

Carvalho, T. P. de and Morvan, Herve and Hargreaves, David and Oun, Hatem and Kennedy, A. (2017) Pore-scale numerical investigation of pressure drop behaviour across open-cell metal foams. Transport in Porous Media, 117 (2). pp. 311-336. ISSN 1573-1634

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Abstract

The development and validation of a grid-based pore-scale numerical modelling methodology applied to five different commercial metal foam samples is described. The 3-D digital representation of the foam geometry was obtained by the use of X-ray microcomputer tomography scans, and macroscopic properties such as porosity, specific surface and pore size distribution are directly calculated from tomographic data. Pressure drop measurements were performed on all the samples under a wide range of flow velocities, with focus on the turbulent flow regime. Airflow pore-scale simulations were carried out solving the continuity and Navier–Stokes equations using a commercial finite volume code. The feasibility of using Reynolds-averaged Navier–Stokes models to account for the turbulence within the pore space was evaluated. Macroscopic transport quantities are calculated from the pore-scale simulations by averaging. Permeability and Forchheimer coefficient values are obtained from the pressure gradient data for both experiments and simulations and used for validation. Results have shown that viscous losses are practically negligible under the conditions investigated and pressure losses are dominated by inertial effects. Simulations performed on samples with varying thickness in the flow direction showed the pressure gradient to be affected by the sample thickness. However, as the thickness increased, the pressure gradient tended towards an asymptotic value.

Item Type: Article
Keywords: Metal foam, CFD, Pore-scale, Tomography, Pressure drop
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Civil Engineering
Identification Number: 10.1007/s11242-017-0835-y
Depositing User: Eprints, Support
Date Deposited: 07 Apr 2017 09:26
Last Modified: 20 Jun 2017 12:00
URI: http://eprints.nottingham.ac.uk/id/eprint/41818

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