Drying peppercorn characteristics in fluidized bed dryer equipped with baffle vortex generators

2017 6th International Conference on Power Science and Engineering

Chuwattanakul, V.^1 ; Banthumporn, K.^1 ; Promvonge, P.^1 ; Eiamsa-Ard, S.^2

Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok

10520, Thailand^1

Faculty of Engineering, Mahanakorn University of Technology, Bangkok

10530, Thailand^2

关键词: Air velocities;    Drying rates;    Final moisture content;    Fluidized bed dryers;    Heat and mass transfer;    Longitudinal vortices;    Operating condition;    Vortex generators;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/136/1/012020/pdf
DOI  :  10.1088/1755-1315/136/1/012020

来源: IOP

【 摘 要 】

The paper deals with the characteristic study of drying peppercorn using fluidized-bed dryer fitted with baffle vortex generators. The experiments were operated at three different superficial air velocities of 1.2Umf, 1.4Umfand 1.6Umf. Experiments were operated from the initial to final moisture contents of around 12% (dry basis). During the experiments, peppercorns were sampling every 5 minutes, for moisture analysis. A typical fluidized-bed dryer was also tested under similar operating conditions for the assessment. The results indicate that the influence of superficial air velocity on drying peppercorn characteristic in the fluidized-bed dryer fitted with baffle vortex generators is more significant than that in the typical fluidized-bed dryer. It is observed that fluidized-bed dryer fitted with baffle vortex generators shows better performance in reducing moisture content with faster drying rate than the typical fluidized bed dryer especially at high superficial air velocity due to the strong longitudinal vortex which helps in improving the fluid mixing, heat and mass transfer rates.