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- W2144834837 abstract "The choking velocity is the minimum gas velocity required for the vertical dilute phase transport of a given solids flux. Experimental choking velocities obtained from the literature for both monosize and multisize particles were compared to choking velocities predicted with various published correlations. For monosize particles, Yang's correlation (1983) gave the most accurate predictions. For multisize particles, all the literature correlations gave rather poor predictions. Much more accurate predictions were obtained with a new simple physical model which assumes that an annulus forms along the pipe wall at low gas velocities. Choking then occurs when this annulus occupies approximately 25% of the total pipe cross-sectional area. La vitesse d'engorgement représente la vitesse minimale du gaz nécessaire au transport vertical de la phase diluée pour un flux de solides donné. Les vitesses d'engorgement expérimentales publiées pour des particules de taille unique et de tallies multiples, ont été comparées aux vitesses d'engorgement prédites à l'aide de corrélations parues. Pour les particules de taille unique, c'est avec la corrélation de Yang (1983) que les prévisions sont les plus précises. En revanche, pour les particules de tailles multiples, les corrélations existantes n'ont fourni que des prédictions relativement mauvaises. On a pu faire des estimations bien plus précises grâce à un nouveau modèle physique simple qui suppose qu'un écoulement annulaire se forme le long de la paroi du tube aux vitesses de gaz peu élevées. L'engorgement se produit alors quand cet espace annulaire occupe approximativement 25% de la section droite du tube." @default.
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- W2144834837 date "1986-04-01" @default.
- W2144834837 modified "2023-10-16" @default.
- W2144834837 title "New model to calculate the choking velocity of monosize and multisize solids in vertical pneumatic transport lines" @default.
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- W2144834837 doi "https://doi.org/10.1002/cjce.5450640205" @default.
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