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- W2766882511 abstract "Light cellular materials are increasingly used in many engineering applications as they present several attractive properties including heat transfer enhancement, low pressure drop compared to packed bed of spheres. Transport properties are dependent on foam morphology and thus, their precise knowledge is required for efficient designing and optimization of industrial devices. Discrepancies and ambiguities in definitions, interpretation of various parameters, limited experimental methods and non-consistencies in measurements are some critical factors that lead to highly scattered morphological and transport properties in the literature. These properties are, however, linked with the strut cross-sectional shape and thus, no relationship exists in the literature that bears a reasonable applicability in multidisciplinary domains. In this context, virtual foams based on based on tetrakaidecahedron unit-cell have been constructed and geometrically characterized. These periodic idealized foam structures are constituted of circular struts whose diameters could be varied arbitrary. The thermo-hydraulic properties of open-cell foams in relation with morphology are systematically studied using 3-D direct pore-scale numerical simulations of single-phase flow in the virtual samples. A comprehensive database (more than 100 samples/cases) of flow and heat transfer characteristics has been generated. Mathematical formulation has been developed to predict accurately the morphological characteristics and discussed with the findings in the literature data. An original definition of pore diameter is proposed and its uniqueness to use as a characteristic length scale has been obtained. Flow regime transitions were identified by analyzing the pressure drop characteristics and friction factor vs. Reynolds number relationship. Similarly, heat transfer results were used to derive heat exchange coefficient between solid and fluid phases of foam material. This length scale has proved to determine ‘universal’ thresholds to identify thermo-hydraulic regimes and is found to be independent of foam morphology. Correlations to predict hydraulic characteristics and heat transfer coefficients/Nusselt number for circular strut open cell foams were derived. The correlations proposed in this work appear to be very generic taking into account variability in foams for variable porosities. The predicted results were validated against numerical and experimental data and an excellent agreement has been obtained." @default.
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- W2766882511 date "2017-10-16" @default.
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- W2766882511 title "Transport properties of solid foams having circular strut cross section using pore scale numerical simulations" @default.
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- W2766882511 doi "https://doi.org/10.1007/s00231-017-2193-2" @default.
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