A SIMPLISTIC ANALYTICAL MODEL OF PERMEABILITY FOR OPEN-CELL METALLIC FOAMS |
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Authors: | Yang Xiaohu Bai Jiaxi Lu Tianjian |
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Institution: | 1.School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China;2.Multidisplinary Research Center for Lightweight Structures and Materials, Xi'an Jiaotong University, Xi'an 710049, China;3.State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, China |
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Abstract: | Based on a generalized tortuosity model and a cubic unit cell topology, an analytical model is developed for predicting the permeability of open-cell metallic foams. The present model has a simple form and requires no fitting or empirical parameters. It is capable of analytically predicting the permeability of open-cell foams over a wide range of porosities (0.55~0.98) and pore densities (5~100 PPI), with good agreement with experimental data. Results demonstrate that the flow tortuosity determined by algorithm branching method enables faithfully capturing the behavior of fluid flow across open-cell metallic foams. Further, the modification made by open pore rate successfully extends the present permeability model from fully-open foams to semi-open ones. |
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Keywords: | open-cell metallic foam|permeability|tortuosity|analytical model|algorithm branching |
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