The performance of continuous mixers for dry powders

Harwood, Colin F.; Walanski, Kenneth; Luebcke, Erdmann; Swanstrom, Carl

doi:10.1016/0032-5910(75)80054-4

Cited by 33 publications

(12 citation statements)

References 7 publications

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“…8 This study investigated the continuous mixing of cohesive and free-flowing particles, which shows that the performance of continuous mixer is determined at least in part by the flow properties of materials. The influence of the agitator design on powder flow has been also studied, 9 where…”

Section: Introductionmentioning

confidence: 99%

Periodic section modeling of convective continuous powder mixing processes

Gao¹,

Ierapetritou²,

Muzzio³

2011

AIChE Journal

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This study aims to develop a general model of the convective continuous mixing process. The main idea is that continuous mixing can be considered as a combination of powder flow and mixing processes. Although powder flow is characterized by the residence time distribution (RTD), powder mixing can be described by a batch mixing process simulated in one periodic section of the continuous mixer. By characterizing the two processes separately, we can calculate the number of sections required to achieve certain homogeneity. In this study, continuous mixing is simulated using the discrete element method, and segregating and non-segregating mixing cases are tested to investigate the applicability of the model. Results show satisfactory predictions by the model, which is able to characterize the continuous mixing performance of both mixing cases. On the basis of this study, we were also able to suggest a novel method in design and control of continuous powder mixing systems. V V C 2011 American Institute of Chemical Engineers AIChE J, 58: [69][70][71][72][73][74][75][76][77][78] 2012

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Section: Introductionmentioning

confidence: 99%

Periodic section modeling of convective continuous powder mixing processes

Gao¹,

Ierapetritou²,

Muzzio³

2011

AIChE Journal

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“…If a cohesive material is mixed with a free-flowing one, the cohesive particles will create a stable pocket resistant to segregation Ž . Harwood et al, 1975 . Breaking such pockets is more difficult if the cohesive material is present in a much smaller quantity than the other ingredient.…”

Section: Blendingmentioning

confidence: 95%

Synthesis of bulk solids processing systems

Wibowo

1999

AIChE Journal

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“…Motionless blenders for free-flowing powders were studied (Chen et al, 1973;Gyenis, 2002). However, these blenders choke when cohesive powders are used (Harwood et al, 1975). Merz and Holtzmüller (1981) and Merz and Lucke (1978) used radionuclide tracers to investigate the RTD and used the dispersion model for calculating the effect of the shaft rotation rate and influence of internal mixing geometries.…”

Section: Motionlessmentioning

confidence: 99%

“…Volumetric feeding was found to be less reliable than weigh feeding using a vibrated hopper delivering directly onto a moving belt on a weigh machine (Harwood et al, 1975;Weinekötter and Gericke, 2000). Pulsed input was also used as a reliable experimental feeding technique (Williams and Rahman, 1971).…”

Section: Feeding In Continuous Blending Systemsmentioning

confidence: 99%