Fluid-dynamic behavior of flaxseed fluidized and spouted bed

Abstract

Processing of particles in a moving bed, such as a fluidized bed or a spouting bed, is commonly used in the operations of drying, coating, and granulation of particulate systems. This process has applications in the chemical, pharmaceutical and, presently, agronomical industries, especially for seed treatment/coating. This research aimed to analyze the fluid-dynamic behavior of fluidized and spouting beds with different air temperatures and loads of flaxseeds (Linum usitatissimum L.), with estimates of the fluid-dynamic parameters correlated to each process. The parameters were compared with the values obtained from classical correlations in the literature, with indications of associated percentages of deviation. Influence of fluid dynamics on the physiological quality of seeds was assessed by germination tests and the germination speed index. An analysis of the results indicated that seed processing was adequate for processing in dynamically active beds; however, temperatures above 50ºC in both beds caused significant reductions in the physiological quality of the seeds. Processing in a fluidized bed presented a smaller reduction of the physiological properties of the flaxseed.

Revestimentos de materiais por Leito Fluidizado e Leito de Jorro: um estudo comparativo

“…O processamento de partículas em leitos móveis, como o leito fluidizado e o leito de jorro, são comumente empregados em secagem, recobrimento e granulação de sistemas particulados, com aplicações nas indústrias, em especial no tratamento/revestimento de sementes (Santana, et al, 2017). O leito de jorro tem sido aplicado no revestimento de partículas sólidas cujo processo usual consiste em atomizar uma suspensão de revestimento sobre as partículas submetidas ao movimento por um fluxo de ar quente.…”