Abstract
ABSTRACT Static pressure and airflow distribution along a corrugated plastic aeration duct under grain were predicted with a computer model for both positive and negative pressure systems. The model included experimentally determined relationships for friction loss, pressure loss through slots in the duct wall, pressure drop through the grain surrounding the duct (shelled corn), and static pressure regain coefficient. Model generated results showed that duct length and duct diameter significantly affected airflow uniformity. Duct entrance velocity and length significantly affected the pressure required at the fan. Grain depth had little effect on uniformity but did affect the pressure required. Airflow uniformity was significantly higher for positive pressure operation than for negative pressure operation under equivalent conditions. Pressure requirements at the fan were significantly higher for negative pressure opera-tion than for positive pressure operation under equivalent conditions.
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