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DOI: 10.1615/ICHMT.2008.CHT.790
page 11

Anthony M. Anderson
Department of Engineering Sciences and Applied Mathematics, Northwestern University, Evanston, Illinois 60608, USA

Lucien N. Brush
Department of Materials Science and Engineering, University of Washington. Seattle, WA, 98195, USA

Stephen H. Davis
Department of Engineering Sciences and Applied Mathematics, Northwestern University, Evanston, Illinois 60608, USA


A foam, which has gas bubbles crowding themselves in a liquid, will coarsen by the rupture of liquid bridges causing the coalescence of adjacent bubbles. In metallic foam, such coarsening is rapid. The aim is to devise a protocol for freezing metallic foam into a strong, lightweight metal bar before the bubbles have combined. Local analysis based on long-wave approximations is used to study the fluid flow and heat transfer in individual lamellae as well as their stability. We discuss how these local analyses can be used as the building blocks for a network model of foam which will allow us to investigate coarsening and freezing at a macroscopic level across multiple lamella branches.

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