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- W2084896056 abstract "Abstract This study concerns the temperature waves generated in a packed bed by a change in the inlet temperature of a percolating fluid. The shape of these waves, and their deformation as they propagate, can be considerably affected by the variation of specific heats and specific volumes with temperature. Two qualitatively different behaviours are theoretically illustrated. For example when the temperature of air, flowing through a bed of glass beads, is raised from 20 to 100°C, the resulting temperature wave is ‘dispersive’ in the sense that it spreads more and more as it propagates, under the effect of the changes in densities and heat capacities of the two phases. A similar but weaker effect occurs for systems CO2-glass and water-glass. On the other hand, a bed of lead beads percolated by carbon dioxide will exhibit a ‘compressive’ trend resulting in a steady and sharp ‘shock wave’. All trends are reversed when a cooling step is considered instead of a heating step. These effects are illustrated using a simplified model that neglects convective dispersion and heat transfer resistances between the two phases. The quantitative importance of the spreading is compared to that due to convective axial dispersion, by evaluating the corresponding Peclet numbers. Depending on the operating conditions the effect illustrated may be predominant (mostly in gas-solid systems and/or at low Reynolds number) or negligible (mostly in liquidsolid systems and/or at high Reynolds). Accounting for the spreading effect (or sharpening effect) due to property variations is thought to be important in the interpretation of fixed-bed experiments, for example when heat transfer coefficients are evaluated from such experiments." @default.
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- W2084896056 date "1986-07-01" @default.
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- W2084896056 title "Heat transfer in percolated fixed beds with temperature-dependent physical properties—compressive and dispersive effects" @default.
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- W2084896056 doi "https://doi.org/10.1016/0017-9310(86)90201-2" @default.
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