期刊
CHEMICAL ENGINEERING SCIENCE
卷 245, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2021.116945
关键词
Hopper flow; Discrete element method; Ensemble averaging; Hard sphere gas
资金
- Innovation Academy for Green Manufacture, Chinese Academy of Sciences (CAS) [IAGM-2019-A03]
- Key Research Program of Frontier Science, Chinese Academy of Sciences (CAS) [QYZDJ-SSW-JSC029]
- National Natural Science Foundation of China [21821005, 91834303, 92034302, 22078330]
In this study, the fluctuation of gravity-driven hopper flow was investigated through experimental and numerical analysis, revealing different probability density functions for particle discharge under various geometrical and operating conditions. Three modes of particle discharging were identified, and the findings may have implications for the design and operation of high-precision feeding systems.
As a classical example of granular flow, gravity-driven hopper flow has been studied for decades, but an in-depth understanding of its fluctuation is still lacking, especially at small-scale and short-term. In this experimental and numerical study, the time interval (t(Delta)) between the discharging of two consecutive grains from hoppers under a series of geometrical and operating conditions is characterized by its probability density function (PDF). By ensemble averaging over a large number of cases, the PDF from simulation and experiments was found to be consistent but totally different for small and big orifices. Three modes of particle discharging were found and each matches a section of the PDF, with two of the modes found in simulating the discharging of hard sphere gas through an orifice, which suggests a similar mechanism behind the two phenomena. These findings may be helpful to the designing and operation of high-precision feeding system, such as in pharmaceutical industries. (C) 2021 Elsevier Ltd. All rights reserved.
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