Hydrodynamic modeling of fingering phenomena in curing process

In many coremaking processes sand is coated with the binder system components and blown into a mold. A catalyst vapor is then introduced through the sand/mold to harden the contained sand-binder mixtures instantly (gassing process). A final air purge then removes (purging process) residual catalyst...

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Bibliographic Details
Published in:Journal of materials science letters 1999, Vol.18 (24), p.2033-2035
Main Authors: BAKHTIYAROV, S. I, OVERFELT, R. A
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Foundry engineering
Metals. Metallurgy
Molding materials. Mold making. Core making
Production techniques
Online Access:Get full text
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Summary:In many coremaking processes sand is coated with the binder system components and blown into a mold. A catalyst vapor is then introduced through the sand/mold to harden the contained sand-binder mixtures instantly (gassing process). A final air purge then removes (purging process) residual catalyst from the hardened core. In evaluating factors affecting gassing and purging processes, it is necessary to consider the flow pattern in a porous medium condition. Due to the complexity of the core box the gas velocity in the porous medium (sand core) is not uniform. Under certain circumstances, fingering phenomena might appear instead of a stable displacement. The problem of this paper is to determine the circumstances when fingered displacement is more likely to develop.
ISSN:0261-8028
DOI:10.1023/A:1006758521979