Resistência ao fluxo de ar das vagens de amendoim com diferentes percentuais de impurezas.

Abstract

Due to the necessity of previous knowledge of the load loss to be won by the group motor-fan, in aeration and drying systems, due to the resistance presented by the porous mass to the flow of air, this work intended to study the resistance of the peanut in bean with different impurity of percentages to the flow of air, using the product with tenor of humidity of 8% wet basis. The testes were performed of the experiment, equipment was used properly projected and built, the losses of peanut bean load were measured in mixed with levels of 2, 4 and 6% of fine impurity. They were considered impurity fine fragments as branches, peels and residues with smaller size than the one of the beans, coming of the field together with the product. The air was insufflated in the peanut mass through a group 0,75cv motor and centrifugal fan, endowed with diaphragm for the obtaining of the flows of air, which varied between 0,3 and 1,1 m3.s-1.m-2. The adjusted models for the different ones percentile of impurity they presented a satisfactory behavior, with determination coefficients above 0,97. It was ended that the measure in that different percentile of impurity they were added to the mass of the product, for any flow of air, it happened an increase in the load loss.