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An improved potential flow model for funnel flow prediction in a central discharging packed bed

机译：An improved potential flow model for funnel flow prediction in a central discharging packed bed

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摘要

Flowing and stagnant zones coexist in central discharging flat-bottomed packed beds. Continuum based approach has been widely used to predict the flow characteristics. In particular, potential flow (PF) model was often used due to its simplicity but has a difficulty in predicting the stagnant zone. In our previous work, a novel PF model was proposed to overcome the difficulty. However, due to the assumption of constant flow resistance coefficient, the local velocity effect and typical non-linear flow mechanism have not been addressed. In this work, the concepts of linear resistance (LR) and constant resistance (CR) flows were proposed first based on the effects of discharging velocity. Then, the local velocity effect on the flow resistance was obtained by connecting the resistances of LR and CR flows in parallel. Further, the effects of LR and CR flows were discussed and validated by recorded data in 2D central discharging packed beds. The improved PF model enables to capture the funnel flow variations under different conditions and develop further understanding of granular flow in the flowing and stagnant zones.

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