Heat and Mass Transfer in Packed Bed Drying of Shrinking Particles

Prado, Manoel Marcelo do; Sartori, D. J. M.

doi:10.5772/14916

Cited by 2 publications

(2 citation statements)

References 54 publications

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“…The current study investigates the packed-bed hot-air drying configuration, which is widely employed for drying grains in batch and small-scale processes. In comparison to fluidized, spouted, or vibro-fluidized bed dryers, this configuration better preserves the structure of the grains due to its static nature, avoiding mechanical impacts [7]. However, the packed-bed drying can result in significant temperature and moisture gradients within the bed as the air flows upwards transferring heat and absorbing moisture, leading to over drying of grains near to the air input and under-drying of grains near the exhaust.…”

Section: Introductionmentioning

confidence: 99%

Heat and Mass Transfer during Sorghum Grains Drying in a Thick Fixed Bed with and without Change of Airflow Direction

Barbosa,

Ferreira,

Freire

et al. 2023

Preprint

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Drying grains in a fixed bed can be an interesting alternative to prevent undesirable breaks and fractures of solids due to mechanical shocks, something that cannot be avoided when drying in moving beds. A disadvantage of fixed bed drying is that there can be significant gradients in the critical variables if the layer of particulate solids is thick. This work shows that periodically changing the direction of drying air flow is an effective technique to reduce differences within the bed and allow better uniformity of the product. Drying in a thick layer of 10 cm of sorghum grains was carried out at 50 and 60oC for air flow velocity of 2.1 m.s-1. The results showed that despite increasing the total drying time, the technique actually allowed a significant decrease in the temperature gradients and moisture content of the sorghum grains. The change in direction of the air flow caused the drying front to be displaced, sometimes towards the top, sometimes towards the base of the bed. At 50oC, drying lasted a total of 240 min, bringing the sorghum grains to an average overall moisture content of 0.13 on a dry basis.

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Section: Introductionmentioning

confidence: 99%

Heat and Mass Transfer during Sorghum Grains Drying in a Thick Fixed Bed with and without Change of Airflow Direction

Barbosa,

Ferreira,

Freire

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Additionally, due to no oxygen, the quality of product dried in SSD is better than that in HAD [2,3]. In terms of dryer system, a packed bed dryer is one of the common techniques because it is a simple operation and low mechanical damage to the material [4].…”

Section: Introduction *mentioning

confidence: 99%

Effect of Operating Conditions on the Ceramic Particles Drying Process by Superheated Steam in the Packed Bed Dryer

Tran

Le²,

Tran

2020

JST

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A novel model of ceramic particle drying by superheated steam in the packed bed dryer is applied to examine the effects of operating conditions on the drying process. It is shown that the drying kinetic has two drying stages: the evaporation flux firstly increases to the maximum value while particle temperature is remained as saturation temperature, then the evaporation flux decreases to the zero, and particle temperature rises to the equilibrium temperature. Results also illustrate that the drying process is faster at the thinner bed layer, smaller particle diameter, and higher initial vapor velocity and temperature.

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Heat and Mass Transfer in Packed Bed Drying of Shrinking Particles

Cited by 2 publications

References 54 publications

Heat and Mass Transfer during Sorghum Grains Drying in a Thick Fixed Bed with and without Change of Airflow Direction

Heat and Mass Transfer during Sorghum Grains Drying in a Thick Fixed Bed with and without Change of Airflow Direction

Effect of Operating Conditions on the Ceramic Particles Drying Process by Superheated Steam in the Packed Bed Dryer

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