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Số người truy cập: 38,046,479

 The effective thermal properties of solid foam beds: Experimental and estimated temperature profiles
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Tác giả hoặc Nhóm tác giả: David Edouard, Tri Truong Huu, Cuong Pham Huu, Francis Luck, Daniel Schweich
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Nơi đăng: International Journal of Heat and Mass Transfer; Số: Vol 53, Issues 19-20;Từ->đến trang: 3807-3816;Năm: 2010
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
The effective radial heat conductivity of a solid foam packing and the wall heat transfer coefficient are determined under fluid flow conditions typical of catalytic reactors. A detailed 2-D heterogeneous model is phase-averaged in order to rigorously define lumped heat transfer parameters. The resulting pseudohomogeneous model involves two fitting parameters only and it is successfully compared with experiments. First, experiments with packed extrudates validate the approach in comparison with known results. A second experiment with solid foams (polyurethane and SiC) allows correlating the radial heat conductivity to the nature of the solid, its morphology and fluid flow characteristics. The method is inspired from the correlations for particles and seems very promising. Conversely, determining the wall heat transfer coefficient yields only an average value (110Wm-2 K-1 ± 15%) and correlation with fluid velocity is impossible in the studied range 0.018–0.32 m s-1.
ABSTRACT
The effective radial heat conductivity of a solid foam packing and the wall heat transfer coefficient are determined under fluid flow conditions typical of catalytic reactors. A detailed 2-D heterogeneous model is phase-averaged in order to rigorously define lumped heat transfer parameters. The resulting pseudohomogeneous model involves two fitting parameters only and it is successfully compared with experiments. First, experiments with packed extrudates validate the approach in comparison with known results. A second experiment with solid foams (polyurethane and SiC) allows correlating the radial heat conductivity to the nature of the solid, its morphology and fluid flow characteristics. The method is inspired from the correlations for particles and seems very promising. Conversely, determining the wall heat transfer coefficient yields only an average value (110Wm-2 K-1 ± 15%) and correlation with fluid velocity is impossible in the studied range 0.018–0.32 m s-1.
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