Experimental Investigation of Minimum Fluidization Velocity and Pressure Drop in Fluidized Bed of Teff Grain

Articles in Press

Document Type : Full Length Research Article

Authors

1 Adama Science and Technology University

2 Faculty of Agriculture, University of Eswatini , Luyengo, Eswatini

3 Department of Mechanical Engineering, Adama Science and Technology University, Adama, Ethiopia

10.22075/jhmtr.2025.35810.1632

Abstract

Gas-fluidization characteristics of Teff grain are crucial for understanding its behavior under gas flow, enabling it to act like a fluid, which is vital for pneumatic conveying systems. Key parameters include the minimum fluidization velocity and the pressure drop across the fluidized bed, which reflect the interaction between gas and grains. These characteristics are essential for selecting the appropriate phase of the pneumatic conveying system, ultimately improving the processing and handling of Teff grain. Air retention capabilities are significant indicators of a material's suitability for dense-phase conveying. Gas fluidized bed tests were performed to evaluate the bulk flow behavior of Teff grain for both dilute and dense-phase pneumatic conveyors. Results indicated that Teff grain has poor air retention, evidenced by bubble formation at low airflow rates, suggesting it is more suitable for dilute-phase conveying. Experiments measured the minimum fluidization air velocity and pressure drop per bed height using a CEL-MKII apparatus at various airflow rates. For the Boset variety (DZ-Cr-409) with (9%-16%) moisture content, the minimum fluidization velocity ranged from 0.57-0.62 m/s and pressure drop from 102.61-106.25 mbar/m, while for the Felagot variety (DZ-Cr-442 RIL77C) with (8%-14%) moisture, values were 0.53-0.57 m/s and 100.4-101.72 mbar/m. These findings guide the design of effective drying and pneumatic conveying systems for Teff grain

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Journal of Heat and Mass Transfer Research

Articles in Press, Accepted Manuscript
Available Online from 27 April 2025

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History

  • Receive Date: 05 November 2024
  • Revise Date: 26 March 2025
  • Accept Date: 27 April 2025

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