Measurement of pressure profiles in pneumatic conveying pipelines

Bradley, M.S.A.; Burnett, AJ; Woodhead, Steve

doi:10.1109/imtc.1995.515419

Cited by 7 publications

(12 citation statements)

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“…Therefore, the Froude number based approaches could be imagined to be valid for dilute-phase=suspension flow conditions, where the gravity force of the particles are to be overcome by providing sufficient inertia force to keep particles in suspension. Bradley (1990) also raised similar scepticism over the use of Froude number term. Therefore, it appears that to adequately represent the dense-phase flow mechanism, it is necessary to accurately model each of the non-suspension and suspension flow phenomena.…”

Section: New Approaches Of Conceptualizing Dense Phase Flowmentioning

confidence: 99%

On Improving Scale-Up Procedures for Dense-Phase Pneumatic Conveying of Powders

Mallick

Wypych

2011

Particulate Science and Technology

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This article presents results of an ongoing effort toward improving the modeling and scale-up procedures for the dense-phase pneumatic conveying of fine powders through pipes. Two new approaches are employed in this study. One approach, derived by modifying an existing reliable dilute-phase model to make it suitable for the dense-phase, has resulted in relatively stable predictions for diameter and length scale-up for two types of fly ash, ESP dust, pulverized brown coal and fly ash=cement mixture. Although some over-predictions still remain for the cases of diameter scale-up, there seems to be a substantial relative improvement in the overall accuracy of predictions (compared to the existing design methods). Another method has been derived using the concept of ''two-layer'' slurry flow modeling (suspension flow occurring on top of a non-suspension moving layer), and this has also resulted in similar improvements. Although the ''two-layer'' technique is believed to be more representative of the actual flow conditions under dense-phase conveying, the simpler ''modified'' method appears to be adequate for practical design purposes.

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Section: New Approaches Of Conceptualizing Dense Phase Flowmentioning

confidence: 99%

On Improving Scale-Up Procedures for Dense-Phase Pneumatic Conveying of Powders

Mallick

Wypych

2011

Particulate Science and Technology

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“…The pipe diameter used in the majority of studies is small, ranging from 0.75 to 2 inches [4,6,22], however some account for pipe bores as large as 4 inches in diameter [23]. One possibility for this trend is that an exponentially greater volumetric air flow rate is required to achieve the same conveying conditions with a larger bore size.…”

Section: Pipeline Geometrymentioning

confidence: 99%

Particle attrition mechanisms, their characterisation, and application to horizontal lean phase pneumatic conveying systems: A review

et al. 2018

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Understanding particle attrition is vital to the optimisation of a wide range of industrial processes. Lean phase pneumatic conveying is one such process, whereby the high energy particle impacts can cause undesirable loss in product quality or change in bulk behaviour. The attrition process is resolved into a material function and a process function; the combination of these functions dictate the attrition mechanism present, and the magnitude of failure observed. Subsequently, the forces applied to the particles are examined within the context of lean phase pneumatic conveying. Finally, empirical and numerical models are reviewed along with comments on experimental method. To summarise some of the findings of this review: the requirement of standardised test equipment is recognised in order to compare the wide variety of particulate materials under comparable loading conditions; stronger correlation between the results obtained from different particle attrition test methods is required; and finally, seldom are the manufacturing conditions (where applicable) linked to the particulate attrition behaviour.

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“…Perhaps that is why dilute-phase models containing the Froude number, such as "Weber A4" (Wypych et al 1990), were reported to provide good predictions for different pipeline configurations (Wypych, Kennedy, and Arnold 1990). Bradley (1990) also raised similar skepticism over the use of Froude number. Unfortunately, Bradley (1990) could not provide any model for solids friction factor as his work mainly concentrated on investigating pressure drops through bends, with limited focus on modeling pressure loss through straight pipes.…”

Section: Efforts To Find Suitable Parameter Groupings For Dense Phasementioning

confidence: 99%

“…Bradley (1990) also raised similar skepticism over the use of Froude number. Unfortunately, Bradley (1990) could not provide any model for solids friction factor as his work mainly concentrated on investigating pressure drops through bends, with limited focus on modeling pressure loss through straight pipes.…”

Section: Efforts To Find Suitable Parameter Groupings For Dense Phasementioning

confidence: 99%

An Investigation into Modeling of Solids Friction for Dense-Phase Pneumatic Conveying of Powders

Mallick

Wypych

2010

Particulate Science and Technology

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This article presents results from an investigation into the modeling of solids friction factor for fluidized dense-phase pneumatic conveying of powders. A fundamental design approach was pursued by employing "straight pipe" and "back calculation" techniques for modeling and using two types of power function formats. The "straight pipe" models were found to be unexpectedly different depending on the selected location of pressure-measuring tapping points (even for the same product). An attempt to explain this variation by studying the "straight pipe" conveying characteristics suggested significant changes in flow mechanisms along the pipe. The derived models were evaluated for scaleup accuracy and stability by predicting for larger and longer pipes. The results showed significant variations in predictions. One format of power function model was found to result in more stable predictions than the other. Possible explanations for the causes of such variations are provided. Physical observations of the flow phenomena of dense-phase conveying for different powders showed the products were mostly conveyed as a dense non-suspension liquid-type-layer along the bottom of the pipe. This mechanism does not seem to be correctly represented by the existing design approach of using a Froude number term in the solids friction factor models, thus initiating a search for suitable alternative dimensionless grouping(s) that can adequately represent the non-suspension flow phenomena. In this study, Steady-state conveying data of three different powders conveyed in various pipes (diameter/lengths) were used for the purpose of modeling and scaleup investigations.

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Measurement of pressure profiles in pneumatic conveying pipelines

Cited by 7 publications

References 0 publications

On Improving Scale-Up Procedures for Dense-Phase Pneumatic Conveying of Powders

On Improving Scale-Up Procedures for Dense-Phase Pneumatic Conveying of Powders

Particle attrition mechanisms, their characterisation, and application to horizontal lean phase pneumatic conveying systems: A review

An Investigation into Modeling of Solids Friction for Dense-Phase Pneumatic Conveying of Powders

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