Numerical study of flow characteristics and energy dissipation over the slotted roller bucket system

The present study aims to evaluate the effects of the arrangement of the teeth in terms of angle, arrangement and radius on the eddy currents, kinetic energy dissipation and turbulence dissipation rate. Four groups of models were created for this purpose. In the first group, each model contained a bucket with two teeth with different angles. The second group included three models where each bucket had two teeth with the same angle, but the angle was different for each bucket. The third group contained three models with different bucket radii. In addition, the last group consisted of two models where each model had two teeth with an angle of 45 degrees. The result showed that the use of teeth with unequal angles plays a significant role in increasing the total turbulence loss. Moreover, the angle of the teeth has a much larger effect on increasing the turbulence loss than changing the bucket radius. In addition, the use of unequal angles in the design of the teeth can significantly increase the loss. The loss can be significantly increased if a larger radius and unequal tooth angles are used simultaneously. Using equal tooth angles with a larger angle result in more loss compared to the case where the angles are small but different. Finally, buckets with larger radius and unaligned and larger tooth angles are considered as the factors that increase the energy loss in buckets, which leads to an increase in the efficiency of the bucket.