Innovative design to enhance solids discharge from conical bottom ion-exchange columns. Part 1

Daas, M.; Retnaswamy, A. V.; Srivastava, Rajiv K.

doi:10.1243/095440805x33153

Cited by 1 publication

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“…Part 1 of this paper [1] discussed the impact of a double pyramid insert on both the flow pattern and discharge rate of dry glass beads and mixtures of glass beads and water in a conical-bottom ionexchange column. Part discusses the impact of severely constricting the outlet diameter, by attaching a throttling vertical tube to the orifice of the conical screen outlet, on both the discharge rate and flow pattern of glass bead -water mixtures.…”

Section: Resultsmentioning

confidence: 99%

“…The column is made of an acrylic tube measuring 12 in OD and 11 1/4 in ID and the discharge section is made of custom-design conical stainless steel screen. Detailed description of the experimental setup can be found in part 1 [1].…”

Section: Methodsmentioning

confidence: 99%

“…A double-pyramid insert was used to alter the flow pattern in a conical hopper from funnel to mass flow. Part 1 [1] showed significant changes in the flow pattern when the insert was incorporated in the hopper. The use of the insert not only prevented formations of stagnant zone along the walls of the hopper but also altered the flow from funnel to mass resulting in a complete and homogenous discharge through the hopper outlet.…”

Section: Introductionmentioning

confidence: 99%

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Innovative Design to Enhance Solids Discharge from Conical Ion-Exchange Columns. Part 2

Daas

Srivastava

2007

Proceedings of the Institution of Mechanical Engineers, Part E:

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An experimental investigation was carried out to study the impact of two retrofitting techniques on the flow pattern and rate of discharging solids from a conical screen hopper at the bottom of an ion-exchange column. The two retrofits were a double-pyramid insert and a throttling vertical tube attached to the outlet orifice. Part 1 [1] discussed the impact of the double-pyramid insert on converting the flow pattern in the conical screen hopper from funnel to mass flow. Part 2 shows that developing severe and sudden constriction at the outlet orifice, by utilizing throttling vertical tube, will raise the shear rate and magnify the interstitial drag effects. This will induce the solid particles to dilate in order to accommodate the shear thereby causing transition from packed bed to suspension flow regime. The dynamics of the flow transition may include a sudden collapse of the interface between the two flow regimes resulting in a significant increase in the mass flowrate. Cavitation is believed to occur under these circumstances resulting in an intensified transition. Furthermore, experimental results support the hypothesis that as the constriction increases, the flow switches to a regime with density waves (plugs) of constant velocity down the throttling vertical tube.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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