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Modeling Convective Drying of Soybean (Glycine Max L): Experiments and Numerical Simulation

DOI: 10.5729

Keywords: Simulation , Mathematical model , Soybean , Drying.

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Abstract:

The production of soybean (Glycine max L) requires that the product is collected healthyand in advance, to minimize losses caused by the attack in the field of insects, diseases andmicroorganisms. Therefore and due to high moisture content at harvest, drying is one of theoperations of primary importance among the techniques involved in the conservation of desirablequalities of products of plant origin. The objective of this work is to obtain the drying curves of soya,in the range of drying air temperature between 45 and 90°C, for the initial moisture content between0.13 and 0.32 and drying air velocity of 0, 0.5, 0.9, 1.5 and 2.5m/s to determine the influence of theseparameters in the process. The experimental phase was performed using a prototype of which was ahair metal tube with 0.15m in diameter, insulated throughout its surface with glass wool and canvas.The air was heated by six electrical resistances with power of 600W, while the temperature wascontrolled with the aid of thermocouples connected to the drying equipment. Were also performednumerical simulations, where the mathematical model used was proposed by Khachaturian [1], andthis search has changed the equation that describes the flow of mass, it is entering the parameters ofair velocity and initial moisture content, obtaining a good agreement between experimental andsimulated data. Was observed that the drying air velocity presents significant influence on the process,there is an increased withdrawal of water during the first hours of drying. Note that the influence ofair temperature on the rate of drying is higher at the beginning of the experiment, reducing theprocessing time. The higher the temperature and airflow, the greater the drying rate and lower thetotal time of exposure to heated air.

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