Brazil is the largest producer and exporter of coffee in the world, one of the main global commodities. During the processing of coffee beans, rotary drums are used in the drying and roasting phases. This equipment is widely used in many industrial sectors. According to characteristics of the drum, particulate material, and operating conditions, different flow regimes may arise. Such regimes have a direct influence on the performance of these processes and therefore their characterization is of great importance. The present work developed an experimental study about the dynamics of coffee beans, under green and roasted conditions, in a rotary drum. Transitions between rolling, cascading, cataracting, and centrifuging regimes were evaluated, for both green and roasted coffee beans. For the centrifuging regime, a comparison between experimental critical rotation speeds and the ones obtained by correlations found in literature was performed. Additionally, a new expression to predict the centrifuging rotation speed was proposed by the authors. Further analyses regarding the rolling regime were also carried out. For this regime, velocity profiles of the particles were evaluated, as well as the thickness of the active layer for different filling degrees and drum rotation speeds. Great similarity was found between the behaviour of the active region for coffee beans before and after the roasting process.
Neste trabalho será estudada a prevalência de obesidade entre dois grupos de gestantes com diabetes, separando entreaquelas que necessitam de terapêutica medicamentosa e as que conseguem bom controle com manejo não medicamentoso. O diabetes gestacional é a intolerância aos carboidratos diagnosticada pela primeira vez durante a gestação. É o problema metabólico mais comum durante esse período, sendo a obesidade um dos principais fatores de risco para o desenvolvimento dessa patologia, a qual gera inúmeros malefícios tanto para a paciente quanto para o concepto. Quando o diabetes é diagnosticado, podendo ser através dos números da glicemia em jejum ou através do exame TOTG 75g, pode-se obter um desfecho gestacional desfavorável, necessitando o mais breve possível da regulação da glicemia sanguínea. Para isso, diferentes estratégias podem ser empregadas, como a não medicamentosa, por meio do exercício físico e da alimentação balanceada, e a medicamentosa com o uso dos hipoglicemiantes orais ou da insulina.
Rotary dryers are a significant capital item for many industrial plants. Many potential benefits can be obtained through a greater understanding of the rotary drying process. In order to improve drying efficacy, a novel version of the rotary dryer, known as the rotoaerated dryer, was evaluated in previous studies. This work has studied the effect of the configuration and arrangement of mini-pipes in the rotoaerated dryers by experimental and CFD techniques. The results obtained showed that it was possible to predict the effect of variations in the configuration of the rotoaerated dryer and obtain the more appropriate arrangement of mini-pipes.
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