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      저자 : Haritz Altzibar (검색결과 1 건)
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        Fine particle flow pattern and region delimitation in fountain confined conical spouted beds

        Mikel Tellabide,Idoia Estiati,Aitor Atxutegi,Haritz Altzibar,Roberto Aguado,Martin Olazar 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-

        A novel borescopic technique together with the monitoring of pressurefluctuation signals (powerspectral distribution, PSD) has been used to trackfine particles and characterize solidflow dynamics infountain confined conical spouted beds. Radial and axial particle velocity profiles have been obtained fordifferent configurations, and spout-annulus and fountain core-periphery interfaces have beendelineated. The downward particle velocities in the annulus peak at intermediate positions in thiszone, whereas the upward velocities in the dilute zones (spout and fountain core) peak at the axis or closeto this position. Among the different configurations analysed in this work, the system without draft tubeshows the greatest vertical particle velocities in almost all the different radial and axial positions. Theevolution of the spout size along the bed depends on the configuration used, but all of them differ fromthose commonly reported in the literature. Thus, the spout expands from the bed bottom to the surface,without any neck at an intermediate bed level. Furthermore, the cross-sectional spout shape has beendelineated in the systems with open-sided draft tube, and significant spout expansion is observed due toair percolation from the spout into the annulus through the opened faces. Finally, the average spoutdiameters of the systems without draft tube and with open-sided draft tubes have been compared withthose predicted by literature correlations. Those proposed by San José et al. and Volpicelli et al. providethe bestfit for the configurations without draft tube and with open-sided draft tube, with their relativeerrors being 9.83% and 8.88%, respectively.

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