Modeling the discharge characteristics of rectangular flights in a flighted rotary drum

Sunkara, Koteswara Rao; Herz, Fabian; Specht, Eckehard; Mellmann, Jochen; Erpelding, Richard

doi:10.1016/j.powtec.2012.09.007

Cited by 31 publications

(17 citation statements)

References 16 publications

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“…For that, it is necessary to study the discharge rate of lifters. Since there have been recent studies reporting on that eld [30,48], such a study was not necessary, but still it was possible to observe the angular position γ f of a lifter at the end of discharge (with respect to the horizontal). It was found that γ f SL < γ f RL .…”

Section: Eect Of Lifters Prolementioning

confidence: 99%

Effect of lifter shape and operating parameters on the flow of materials in a pilot rotary kiln: Part I. Experimental RTD and axial dispersion study

et al. 2015

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Experiments on the residence time distribution (RTD) and axial dispersion for the continuous ow of sand and broken rice, through a pilot scale rotary kiln equipped with lifters, are reported. Factors such as the rotational speed, the kiln slope, the materials ow rate and the exit dam height have been studied. Furthermore, two proles of lifters were used: straight lifters (SL) and rectangular lifters (RL). Thus, under varying conditions the RTDs were obtained by the typical stimulus response test using a tracer and the corresponding axial dispersion coecients were determined. The validity of the axial dispersion model was assessed in this study, and the model was found to match well with the experimental data. A large number of experiments was conducted, so that, a mathematical model could be developed to predict the axial dispersion coecient of the solid particles within the kiln. Comparisons with reported models are also discussed.The second part of this study will be concerned with the experimental kiln hold-up and the mean residence time (MRT) of solid particles.

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Section: Eect Of Lifters Prolementioning

confidence: 99%

Effect of lifter shape and operating parameters on the flow of materials in a pilot rotary kiln: Part I. Experimental RTD and axial dispersion study

et al. 2015

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“…This dynamic angle depends on the rotation speed, drum's radius and friction coefficient as it was demonstrated by Schofield and Glikin [15] by studying the equilibrium of a particle about to fall from the flight. The volume of material in the flight can be calculated by the formula given in [5] for angled flight with two segments or in [9] for right angled flight. For three segments flight, a similar formula can be found in [8].…”

Section: Description Of the Problem And Simulation Parametersmentioning

confidence: 99%

“…However, for theoretical and experimental purposes, simple flight shapes are frequently considered composed by one , two or three segments ( [6], [7], [8], [5], [9]).…”

Section: Introductionmentioning

confidence: 99%

“…While the behaviour of the granular bed material is greatly studied by the DEM approach [10], [11], the other topics are treated essentially with theory or experiments. Thus, most of the studies on the subject of the holdup of the material use the approach of bulk material [12], [6], [8], [5], [9]. Experiments also showed that the mean residence time is affected by the flight's shape.…”

Section: Introductionmentioning

confidence: 99%

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Influence of flight shape on discharging profiles of granular material in rotary dryer

et al. 2017

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In this work, Discrete Element Method (DEM) is used in order to calculate the motion of granular material in rotating dryers. We are particularly interested in analysing the effect of flight shape on the behaviour of spherical particles in the cross section of the dryer. We will be using two segments flights and three different profiles : a straight flight (180 • between both segments), an angled flight (with an angle of 120 •) and a rightangled flight (90 •). The results show that the profile of the flight affects significantly the motion of the particles in the cross section of the dryer. Changing the angle between the segment's flight, changes the flight loading and thus the material holdup which leads to different discharging profiles of the flight. For a right angled flight, the range of the discharge angle increases leading to a more uniformized cascade pattern in time and an enlarging of the area occupied by the curtains of particles. The specific durations (discharging time, falling time) are also determined and studied as a function of the flight shape.

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“…Rotary dryers are one of the most commonly used devices to dry granular or particulate materials due to its flexibility and versatility and the characteristics that lead to uniform product quality [1][2][3]. They are extensively employed to handle a wide range of solids and used across a wide range of industries, such as chemical, metallurgy, mineral industry, food and tobacco industries [4].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Total Residence Time in a Rotary Dryer

Huang

Weng

et al. 2015

International Journal of Food Engineering

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A mathematical model for the rotary dryer that determines the total residence time is developed. Experiments were performed in a laboratory-scale direct contact rotary dryer with the gas flowing concurrently with the solids. The model predictions depicted that the total residence time decreases with increasing the inclination of the rotary drum, the speed of rotation and the radius of rotary drum. The validation of the model was carried out experimentally for maize while varying the inclination of the rotary drum and the speed of rotation. The experimental results were observed to be in good agreement with the model predictions.

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Modeling the discharge characteristics of rectangular flights in a flighted rotary drum

Cited by 31 publications

References 16 publications

Effect of lifter shape and operating parameters on the flow of materials in a pilot rotary kiln: Part I. Experimental RTD and axial dispersion study

Effect of lifter shape and operating parameters on the flow of materials in a pilot rotary kiln: Part I. Experimental RTD and axial dispersion study

Influence of flight shape on discharging profiles of granular material in rotary dryer

Modeling the Total Residence Time in a Rotary Dryer

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