Axial dispersion of solid particles in a continuous rotary kiln

Kohav, T.; Richardson, James T.; Luss, Dan

doi:10.1002/aic.690411112

Cited by 32 publications

(19 citation statements)

References 28 publications

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“…The model was similar to the one developed by Rogers and Gardner. 14 16 proposed different variations of models similar to Black's. These models vary in the way the randomness of the radial position is treated.…”

Section: Introductionmentioning

confidence: 99%

Modeling weight variability in a pan coating process using Monte Carlo simulations

2006

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The primary objective of the current study was to investigate process variables affecting weight gain mass coating variability (CV m ) in pan coating devices using novel videoimaging techniques and Monte Carlo simulations. Experimental information such as the tablet location, circulation time distribution, velocity distribution, projected surface area, and spray dynamics was the main input to the simulations. The data on the dynamics of tablet movement were obtained using novel video-imaging methods. The effects of pan speed, pan loading, tablet size, coating time, spray flux distribution, and spray area and shape were investigated. CV m was found to be inversely proportional to the square root of coating time. The spray shape was not found to affect the CV m of the process significantly, but an increase in the spray area led to lower CV m s. Coating experiments were conducted to verify the predictions from the Monte Carlo simulations, and the trends predicted from the model were in good agreement. It was observed that the Monte Carlo simulations underpredicted CV m s in comparison to the experiments. The model developed can provide a basis for adjustments in process parameters required during scale-up operations and can be useful in predicting the process changes that are needed to achieve the same CV m when a variable is altered.

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Section: Introductionmentioning

confidence: 99%

Modeling weight variability in a pan coating process using Monte Carlo simulations

2006

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“…The mean residence time under these operating conditions is 46.5 min and the variance is 2.2 min 2 (6 · 10 -4 s 2 ). The Peclet number is, therefore, extremely high (around 2000), as is usual for rotary kilns with a high L/D ratio [23][24][25]. The flow regime in our pilot kiln can thus be considered to be a plug flow with low axial dispersion.…”

Section: Axial and Transverse Motion Of Sandmentioning

confidence: 93%

Experimental Apparatus for Studying Heat Transfer in Externally Heated Rotary Kilns

et al. 2011

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Rotary kilns are widely used in several branches of the chemical industry. In order to control the temperature of the solid and the gas flowing through the kiln, it is important to understand the heat exchange phenomena that occur. The design and construction of a novel experimental device to study heat exchange in rotary kilns is described. The device, which comprises a rotary kiln equipped with an external electrical heating system, enables the study of the influence of various parameters such as the solid flow rate, the kiln inclination angle, the rotational speed, or the presence of lifters on heat exchange and in particular on the heat exchange coefficient between the solid and the wall. Preliminary experimental results concerning the influence of the solid flow rate and the rotational speed on the solid-to-wall heat exchange coefficient are presented.

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“…o The boundaries and loading conditions types of unstructured grid. We have a kiln with a big dimension (Kohar, 1995), so in order to see the limits conditions, the loading and the grid structure in the model, we have enlarge the zones shown in Figure 6. …”

Section: Numerical Simulation Using the Finite Element Methodsmentioning

confidence: 99%

"Hot Rotary Kiln Deformability for Cement Plant, Experimentation, and Numerical Simulation"

Janati¹

2017

IOSR JMCE

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Axial dispersion of solid particles in a continuous rotary kiln

Cited by 32 publications

References 28 publications

Modeling weight variability in a pan coating process using Monte Carlo simulations

Modeling weight variability in a pan coating process using Monte Carlo simulations

Experimental Apparatus for Studying Heat Transfer in Externally Heated Rotary Kilns

"Hot Rotary Kiln Deformability for Cement Plant, Experimentation, and Numerical Simulation"

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