Fluid Dynamics in Concurrent Rotary Dryers and Comparison of their Performance with a Modified Dryer

Silvério, Beatriz Cristina; Façanha, J.M.F.; Arruda, E. B.; Murata, V. V.; Barrozo, M. A. S.

doi:10.1002/ceat.201000338

Cited by 20 publications

(16 citation statements)

References 11 publications

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“…As a result, the fluid dynamic behaviour in rotating drums has attracted numerous research efforts from both the engineering and physics communities over the past few decades (Silvério et al, 2011;Santos et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Transition Phenomenon Investigation Between Different Flow Regimes in a Rotary Drum

Santos

Scatena

Duarte

et al. 2016

Braz. J. Chem. Eng.

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-Rotary drums can show different granular flow regimes each one with its own specific flow behavior, which increase the complexity in their study. The way particles move inside the rotary drum is directly related to the mass and energy transfer rates, and consequently to the process performance. Thus, an experimental investigation regarding the transition between different flow regimes inside a rotary drum was carried out in the present work. To the best of our knowledge, the hysteresis phenomenon was observed for the first time in the transition between cataracting-centrifuging regimes, which was shown to be dependent on the physical properties of the particles such as sphericity, density and particle-wall friction coefficient. A new expression for the centrifuging critical rotation speed was proposed in this work.

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Section: Introductionmentioning

confidence: 99%

Transition Phenomenon Investigation Between Different Flow Regimes in a Rotary Drum

Santos

Scatena

Duarte

et al. 2016

Braz. J. Chem. Eng.

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“…Rotary dryers are the usual choice for drying fertilizers [14,15,[18][19][20][21]. This sort of dryer provides an intermittent process because the material is periodically exposed to the dry air.…”

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confidence: 99%

Monoammonium phosphate (MAP) fertilizer drying kinetics in tray dryer

Covello

Nitz

2018

CI&CEQ

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The drying behaviour of monoammonium phosphate fertilizer was examined in a static tray dryer, establishing kinetic parameters that may be used to improve the design of dryers. Drying temperatures ranged from 80 to 95 °C, and surface air velocity was 0.50 m/s. The material was previously separated into two particle sizes, between 1.40 and 2.38 mm mean diameter. Drying curves were analysed qualitatively and seven empirical kinetic thin-layer models were fitted. The drying kinetic showed to be temperature-dependent: a moisture ratio reduction of 90% was achieved twice as fast at 95 °C than at 80 °C. On the other hand, particle size did not exert significant influence on the drying rate. The results showed a decreasing drying rate throughout the whole process. All studied models adjusted well to the experimental data: R 2 values were all above 0.999. The two-term model generated the lowest RMSE and χ 2 values, between 0.00621 and 0.010743 and between 0.000044 and 0.000115, respectively.

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“…As the inclination of the rotary dryer increased, the component of the gravitational force of a single particle in the axial direction also increases. Hence, there is an increment in the particle's axial velocity, which reduces the total residence time of particles [29]. The total residence time as a function of speed of rotation is presented in Figure 2 particles through the drum occurs by the combined effect of the particles cascading from the flights and the drag force exerted by the gas acting on the particles.…”

Section: Model Outputmentioning

confidence: 98%

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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Fluid Dynamics in Concurrent Rotary Dryers and Comparison of their Performance with a Modified Dryer

Cited by 20 publications

References 11 publications

Transition Phenomenon Investigation Between Different Flow Regimes in a Rotary Drum

Transition Phenomenon Investigation Between Different Flow Regimes in a Rotary Drum

Monoammonium phosphate (MAP) fertilizer drying kinetics in tray dryer

Modeling the Total Residence Time in a Rotary Dryer

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