An Investigation on Permeability of Ceramic Foam Filters (CFF)

Akbarnejad, Shahin; Kennedy, Mark William; Fritzsch, Robert; Aune, Ragnhild E.

doi:10.1007/978-3-319-48248-4_159

Cited by 6 publications

(15 citation statements)

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“…Thereafter, the samples were manually resized to about 49.5-mm diameter to fit into the filter holder, as explained elsewhere. [9] Group 3 of the samples was used to study the effect of fluid bypassing on permeametry parameters of the 30, 50, and 80 PPI CFFs. Therefore, the liquid permeametry experiments were performed first on the unsealed samples.…”

Section: A Experimental Proceduresmentioning

confidence: 99%

“…In metallurgy, CFFs are used to remove undesired nonmetallic particles from molten metal before casting, [1,4,[7][8][9][10][11][12][13] i.e., filtration. In order to prime the filters, the melt has to reach a certain pressure on the top of the filter to initiate passage through the filter.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12]14] To estimate, adjust, and maintain the required pressure and to regulate the melt velocity, it is essential to determine the Darcy and non-Darcy permeability coefficients of the filter. [8,9,15] The permeability coefficients can be obtained using permeametry experiments. [16][17][18] In general, permeametry is based on a gas or liquid flow through a porous media.…”

Section: Introductionmentioning

confidence: 99%

“…Thereafter, the Darcy and non-Darcy permeability coefficients k 1 (m 2 ) and k 2 (m) can be estimated using the Forchheimer equation for incompressible fluids (Eq. [1]), [2,8,9,15,17,[19][20][21] if the fluid dynamic viscosity l (Pa s) and fluid density q (kg/m…”

Section: Introductionmentioning

confidence: 99%

“…In the literature, [8,9,17,18,[22][23][24][25][26][27][28][29][30][31][32] it has been stated that accurate pressure drop estimates only can be achieved when fluid bypassing is avoided. If the CFF samples are not fully sealed, fluid will flow through the filter as well as the gap between the filter and filter holder.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Fluid Bypassing on the Experimentally Obtained Darcy and Non-Darcy Permeability Parameters of Ceramic Foam Filters

Akbarnejad

Pour

Jonsson

et al. 2016

Metall Mater Trans B

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SHAHIN AKBARNEJAD, MOHSEN SAFFARI POUR, LAGE TORD INGEMAR JONSSON, and PÄ R GÖ RAN JÖ NSSONCeramic foam filters (CFFs) are used to remove solid particles and inclusions from molten metal. In general, molten metal which is poured on the top of a CFF needs to reach a certain height to build the required pressure (metal head) to prime the filter. To estimate the required metal head, it is necessary to obtain permeability coefficients using permeametry experiments. It has been mentioned in the literature that to avoid fluid bypassing, during permeametry, samples need to be sealed. However, the effect of fluid bypassing on the experimentally obtained pressure gradients seems not to be explored. Therefore, in this research, the focus was on studying the effect of fluid bypassing on the experimentally obtained pressure gradients as well as the empirically obtained Darcy and non-Darcy permeability coefficients. Specifically, the aim of the research was to investigate the effect of fluid bypassing on the liquid permeability of 30, 50, and 80 pores per inch (PPI) commercial alumina CFFs. In addition, the experimental data were compared to the numerically modeled findings. Both studies showed that no sealing results in extremely poor estimates of the pressure gradients and Darcy and non-Darcy permeability coefficients for all studied filters. The average deviations between the pressure gradients of the sealed and unsealed 30, 50, and 80 PPI samples were calculated to be 57.2, 56.8, and 61.3 pct. The deviations between the Darcy coefficients of the sealed and unsealed 30, 50, and 80 PPI samples found to be 9, 20, and 31 pct. The deviations between the non-Darcy coefficients of the sealed and unsealed 30, 50, and 80 PPI samples were calculated to be 59, 58, and 63 pct.

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Section: A Experimental Proceduresmentioning

confidence: 99%