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 Solid foams as packed pentagonal dodecahedrons
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Tác giả hoặc Nhóm tác giả: Tri Truong Huu, Cuong Pham Huu, David Edouard
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Nơi đăng: 'Metfoam2009', September 2003, Bratislava - Czech Republic (Poster); Số: xxx;Từ->đến trang: xxx;Năm: 2009
Lĩnh vực: Khoa học công nghệ; Loại: Báo cáo; Thể loại: Quốc tế
TÓM TẮT
The modeling of the three-dimensional structure of solid foams and their geometrical dimensions is part of fundamental necessity for investigation in many processes. The research reported in this paper was under-taken to fulfill this need. In literature, the foam cell geometric idealization has been employed for analytical and computational studies which are used for heat and mass transfer modeling. The main theoretical geometrical (RUC, cubic and the tetrakaidecahedron) models were synthesized by Edouard et al. The next step in the direct cell modeling is obtaining the most representative cell structure of a solid foam valid on a large range of porosities (i.e. 0.7 < e < 0.95). In this context, the perfect regular pentagonal dodecahedron geometry with triangular or cylindrical struts is developed in order to estimate the main characteristic lengths of the cellular material. Commercially available solid foams form a complex array of interconnected struts with an irregular lump of solid at the intersection of two struts. This matter deposit can be taken into account in the pentagonal dodecahedron geometry with smooth volume. Finally, the theoretical values (strut and pore diameters, specific surface) obtained with this new pentagonal dodecahedron model are compared with the main models and experimental values of the open literature
ABSTRACT
The modeling of the three-dimensional structure of solid foams and their geometrical dimensions is part of fundamental necessity for investigation in many processes. The research reported in this paper was under-taken to fulfill this need. In literature, the foam cell geometric idealization has been employed for analytical and computational studies which are used for heat and mass transfer modeling. The main theoretical geometrical (RUC, cubic and the tetrakaidecahedron) models were synthesized by Edouard et al. The next step in the direct cell modeling is obtaining the most representative cell structure of a solid foam valid on a large range of porosities (i.e. 0.7 < e < 0.95). In this context, the perfect regular pentagonal dodecahedron geometry with triangular or cylindrical struts is developed in order to estimate the main characteristic lengths of the cellular material. Commercially available solid foams form a complex array of interconnected struts with an irregular lump of solid at the intersection of two struts. This matter deposit can be taken into account in the pentagonal dodecahedron geometry with smooth volume. Finally, the theoretical values (strut and pore diameters, specific surface) obtained with this new pentagonal dodecahedron model are compared with the main models and experimental values of the open literature
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