A characterization of the process of drying the corozo (Bactris guineensis) fruit behavior, performed by numerical simulation CFD was carried out. A variation of the drying process input conditions was made choosing the temperature as variable, analyzing its effects on the drying of the corozo when being implemented in the ranges between 50 °C and 85 °C with specific relative humidity conditions of 76% and drying rate of 1 m/s, for which the convective heat transfer models and phase change models were used. The curves of the drying process of the biomass were obtained for each temperature, profiled the speed and moisture loss inside the biomass. The results obtained by numerical simulation are compared with those obtained experimentally showing reliability of this practice. The drying process of the corozo can be used for its preservation as food and its use as a source of unconventional energy generation.
The drying process for "corozo" (Bactris guineensis) is performed in order to establish the values for variables such as temperature and time, while producing adequate dehydration of this type of fruit. Two temperatures values were used, 50°C and 70°C, and a gravimetric procedure was used, with a mass baseline of 100 g, with ripe fruit. The time interval used for data collection was 5 minutes. Tests were also performed to determine the water mass diffusivity inside the fruit considering the same temperature range of the main experiment. A computational validation was also done for the drying process through a computational fluid dynamics (CFD) analysis from the physical properties of the established biomass together with the process conditions, using the mass and energy conservation models and continuity in porous media. A very similar performance was obtained between experimental tests and computational simulation, reduction of the drying time by 40% for a temperature of 70 °C when compared to 50 °C.
In this paper we study the thermomechanical effects generated in the tool used in the friction-stir welding (FSW) process by finite element analysis (FE) in welded joints of structural aluminum AA1100. A modeling was carried out using Structural Multiphysics and Computational Fluid Dynamics (CFD) couplings using tools with three different shoulder profiles (flat, spiral and concentric), in order to evaluate the influence of its geometry on the heat generated during the process and heat transferred and mechanical stress on the tool. As a result, thermal profiles, stress analysis, heat generated in the process and torque transmitted in the joint and tool interaction zone were obtained. In addition, the values of heat loss through the tools were estimated, which are less than 10%, with 87% of the melting temperature reached of the joints, corroborating the established in the literature.
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