FLUIDIZATION OF MILLET AND PEA SEEDS
https://doi.org/10.26897/2687-1149-2021-5-13-19
Abstract
One of the convective drying methods used to intensify the process of drying granular materials is the use of a device with a fluidized bed. The essential advantages of fluidized bed dryers are the uniform drying of all the particles in the bed and the ease of loading and unloading the material. The study goal was to conduct an experimental study of the hydrodynamics of the fluidized bed of millet and pea seeds and the determination of the first critical velocity (the rate of the beginning of fluidization) based on these data. The authors took small (millet) and large (pea) seeds for the experiment. Based on the experimental data obtained, they constructed pseudo-liquefaction curves - AP = f (v) for millet and peas to determine the first critical fluidization rates (0.73 m/s for millet and 1.68 m/s for peas). The experimentally found values of the first critical fluidization rate were compared with the values calculated by the equations of O.M. Todes, Wen and Yu, and Grace. The study showed that all the equations provide an acceptable accuracy of calculations, but the accuracy of using the equation of O.M. Todes is somewhat higher. Therefore it can be primarily recommended for engineering analysis. The first critical fluidization rates, calculated according to the formula of O.M. Todes, were, accordingly: 0.69 m/s for millet and 1.60 m/s for pea. The calculation and experimental data on the first critical fluidization rates for millet and peas agree satisfactorily (the relative error for millet is 5.5%, for peas - 4.8%). The sufficiently high accuracy of the first critical fluidization rates is explained by the correct geometric shape of the studied seeds, which is close to spherical. Therefore, the first critical fluidization speed of the studied seed material can be determined using the formula of O.M. Todes.
About the Authors
ELENA L. Babicheva
Russian State Agrarian University - Moscow Timiryazev Agricultural Academy
Russian Federation
Russian Federation
STANISLAV P. Rudobashta
Russian State Agrarian University - Moscow Timiryazev Agricultural Academy
Russian Federation
Russian Federation
IVAN I. Sidelnikov
Moscow Polytechnic University
Russian Federation
Russian Federation
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Review
For citations:
Babicheva E.L., Rudobashta S.P., Sidelnikov I.I. FLUIDIZATION OF MILLET AND PEA SEEDS. Agricultural Engineering (Moscow). 2021;(5):13-19. (In Russ.) https://doi.org/10.26897/2687-1149-2021-5-13-19
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