Influence of flight design on the particle distribution of a flighted rotating drum

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

doi:10.1016/j.ces.2012.12.035

Cited by 40 publications

(31 citation statements)

References 12 publications

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“…The properties of these non-cohesive materials are given in Table 1. The experimental procedure and the methodology of data evaluation were followed according to the earlier works of Sunkara et al [31]. The experimental settings are listed in Table 2.…”

Section: Methodsmentioning

confidence: 99%

Transverse flow at the flight surface in flighted rotary drum

et al. 2015

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Section: Methodsmentioning

confidence: 99%

Transverse flow at the flight surface in flighted rotary drum

et al. 2015

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“…cooling/drying) processes, many studies on optimizing the flight design have been performed. For example, Sunkara et al [20] developed a mathematical model for a rectangular flight to be used to optimize the total particle surface areas of mixing and drying/cooling, where the influences of flight numbers and length ratios are studied. They found that the cascading rate of particles may decrease during the initial discharging when the flight length ratio increases.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Analysis of Particle Mixing and Conduction in Wavy Drums

Gui¹,

Yang²,

et al. 2015

Drying Technology

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A thermal -discrete element method (DEM) is used to simulate particle mixing and heat conduction inside wavy drums to explore the effects of wavy walls. Sinusoidal configurations with different waves on the walls are simulated. The Lacey mixing index is applied to analyze the mixing characteristics. The driven forces from the wavy wall, either positive/negative or effective driven forces, are analyzed to explain the mechanisms of mixing enhancement in the wavy drum. A new control parameter is proposed to explain the mechanism of mixing enhancement. It is found that a locally oscillating effect exists in wavy drums, which is imparted on the bulk rotating motions of particles, and enhances the characteristics of particle mixing and heat conduction significantly. Except over large wave numbers and rotating speeds when the flow regime is deteriorated for mixing, the wavy drum is generally beneficial for mixing augmentation as well as conduction enhancement.

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“…The knowledge of the behaviour of the granular material is a preliminary step to this design. From a global point of view, as suggested by some authors, this behaviour can be separated into different phases: (i) the drum is fed with material to dry; (ii) the material is lifted with lifters fixed all over the drum periphery; (iii) the material leaves the lifters when the angle of the free surface on each lifter is greater than the dynamic angle of repose; (iv) the material falls into the hot gas flow environment; and finally (v) the material is deposited on the bed of the drum.…”

Section: Introductionmentioning

confidence: 99%

“…Most works, on material volume carried by the lifters, consider the material lifted by the lifters as a solid delimited by both the tube wall, the lifter wall, and the free surface of the material. Using the dynamic angle of repose, the volume of material is estimated geometrically as a function of rotation speed and geometrical parameters describing the shape and the position of the lifter . Moreover, in order to estimate the falling time and falling length, these authors consider a vertical trajectory of the particle and neglect the air resistance.…”

Section: Introductionmentioning

confidence: 99%

“…Among the numerous parameters that control the efficiency of the process, particle trajectories and mean residence time of the material in the dryer seem to be important. As it has been shown by several authors, they are influenced by different parameters as the geometrical parameters describing the shape of the lifters, the rotation speed of the drum, the ratio of diameter, and length of the drum . Moreover, some authors developed models, like the compartment model of Ajayi and Sheehan, in order to calculate the Residence Time Distribution (RTD), which is frequently determined experimentally for specific configurations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Theoretical description of the motion of a particle in rotary dryer

et al. 2018

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This paper presents a theoretical description of a particle motion in a rotary dryer equipped with straight lifters distributed on its periphery. In this configuration, the transport of granular materials occurs with cyclic cascades that can be decomposed into three phases: lifting, discharging, and falling into the air stream. In order to describe each of these phases, we have focused on the motion of a single particle in a rotating drum. In this condition, the analytical solution of the motion equation of each phase is found. With these solutions, the position and the velocity of the particle at any time are thus expressed as a function of physical parameters of the particle, physical parameters of the drum, and physical parameters of air in the drum, called operating parameters in practice. With these equations, we are able to calculate the behaviour of the particle as a function of the operating parameters. The transposition to the industrial context is made with an application. We show how these equations particularly permit the estimation of the Mean Residence Time (MRT) of material during the drying process as a function of operating parameters. Such estimations have been validated by comparison with experimental data of MRT found in the literature. The work presented in this paper gives some useful mathematical relations for whose who are interested in drum design optimization (lifter length, drum radius, drum length, etc.). More specifically, they can be used to help with the choice of operational parameters values that would achieve a given value of MRT for particular product.

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Influence of flight design on the particle distribution of a flighted rotating drum

Cited by 40 publications

References 12 publications

Transverse flow at the flight surface in flighted rotary drum

Transverse flow at the flight surface in flighted rotary drum

Numerical Simulation and Analysis of Particle Mixing and Conduction in Wavy Drums

Theoretical description of the motion of a particle in rotary dryer

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