Banca de DEFESA: FERNANDO AZALIM JÚNIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : FERNANDO AZALIM JÚNIOR
DATE: 19/07/2022
TIME: 14:30
LOCAL: SALA 100
TITLE:

ENERGY AND EXERGETIC ANALYSIS OF CORN DRYING IN CYLINDRICAL FLOW DRYER
AIR VERTICAL USING THE FINITE VOLUMES METHOD

KEY WORDS:

Drying in a fixed bed of grains. Corn. Finite Volume Method. CFD Energetic and Exergetic Analysis

PAGES: 78
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUBÁREA: Engenharia Térmica
SUMMARY:

Grain drying is a process for removing moisture from agricultural products in order to preserve their quality. However, this process has a high energy expenditure, which varies from 10 to 25% of the national energy use each year. Therefore, drying studies are relevant in order to better use energy resources. The present work carried out the study of a mathematical model for drying corn grains in a fixed bed. The mathematical model was based on the literature and the numerical results were solved by the Finite Volume Method with the ANSYS Fluent software and the User-Defined Function tool. The experimental data were obtained from Dias (2019) who carried out 6 experiments with temperatures of 40, 50 and 60°C and speeds of 0.8 and 1.3 m/s for the drying air in a cylindrical dryer with a diameter of 130mm and 200mm high. The experimental data were compared with the numerical results to validate the mathematical model. The validation considered 3 parameters: coefficient of determination R^2, root mean square error (RMSE) and BIAS percentage (PBIAS). The values measured for the 6 experiments showed excellent agreement with the values simulated for the two-dimensional model, with the value of R^2 varying between 0.997 and 0.999 and the values of RMSE and PBIAS close to zero. Three corn property equations from the literature were added to the mathematical model to replace the old equations. When carrying out the validation, he concluded that these equations can be used in the mathematical model. The three-dimensional model also predicted the drying behavior and the values were close to the two-dimensional model. An energetic and exergetic analysis of the 6 drying experiments was carried out, where the experiment with a temperature of 40°C and a speed of 0.8 m/s, obtained the highest average of energy efficiency, being equal to 17.5% and the experiment with temperature of 60°C and speed of 0.8m/s, it obtained the highest average of exergetic efficiency, being equal to 2.5%.

BANKING MEMBERS:
Interno - ANDRE GUIMARAES FERREIRA
Presidente - JOSE LEONCIO FONSECA DE SOUZA
Externo à Instituição - RAFAEL PINHEIRO AMANTÉA - IETEC