Three-dimensional Airflow Pressure Patterns in Flat-Bottom Bins Filled with Barley for Different Duct Configurations

The airflow pressure patterns within grain beds significantly affect grain drying and aeration. In this study, the three-dimensional airflow pressure patterns in a flatbottom bin of diameter 4.16 m, filled with barley was simulated. The developed finite element model was solved using the computational fluid dynamics software COMSOL Multiphysics. Predicted static pressure values across the grain bed were validated against experimental measurements (from studies conducted in a flat-bottom bin filled with barley when air was forced through from a centrally located single straight duct, flushed with floor); and overall relative error was around 2.5%. The effect of variations in duct configuration on the airflow pressure patterns were simulated for different duct cross-sectional areas, air escape areas, duct positions and number of ducts. Inferences from this study will facilitate in duct selection for efficient grain drying and aeration systems.