Version 1
: Received: 28 December 2023 / Approved: 29 December 2023 / Online: 29 December 2023 (05:36:22 CET)
How to cite:
Barbosa, L.D.S.; Ferreira, M.D.C.; Freire, J.T.; Freire, F.B.; Freire, F.B. Heat and Mass Transfer during Sorghum Grains Drying in a Thick Fixed Bed with and without Change of Airflow Direction. Preprints2023, 2023122255. https://doi.org/10.20944/preprints202312.2255.v1
Barbosa, L.D.S.; Ferreira, M.D.C.; Freire, J.T.; Freire, F.B.; Freire, F.B. Heat and Mass Transfer during Sorghum Grains Drying in a Thick Fixed Bed with and without Change of Airflow Direction. Preprints 2023, 2023122255. https://doi.org/10.20944/preprints202312.2255.v1
Barbosa, L.D.S.; Ferreira, M.D.C.; Freire, J.T.; Freire, F.B.; Freire, F.B. Heat and Mass Transfer during Sorghum Grains Drying in a Thick Fixed Bed with and without Change of Airflow Direction. Preprints2023, 2023122255. https://doi.org/10.20944/preprints202312.2255.v1
APA Style
Barbosa, L.D.S., Ferreira, M.D.C., Freire, J.T., Freire, F.B., & Freire, F.B. (2023). Heat and Mass Transfer during Sorghum Grains Drying in a Thick Fixed Bed with and without Change of Airflow Direction. Preprints. https://doi.org/10.20944/preprints202312.2255.v1
Chicago/Turabian Style
Barbosa, L.D.S., Flavio Bentes Freire and Fábio Bentes Freire. 2023 "Heat and Mass Transfer during Sorghum Grains Drying in a Thick Fixed Bed with and without Change of Airflow Direction" Preprints. https://doi.org/10.20944/preprints202312.2255.v1
Abstract
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.
Keywords
fixed bed; grains drying; airflow reversal
Subject
Engineering, Chemical Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
