Rolling and bouncing dynamics of particles in the inclined rotating bowl for sago sizing mechanism

• If the radial distance at which particle tends to fly is farthest from the center of axis of rotation, the escape velocity of the particle is maximum.
• When increasing rotational speed of the bowl, the flight of particle is attained quickly and its residence time gets reduced.
• The particle will fly only in the top half geometry of the bowl.
• The analytical results coincide with the experimental results with negligible error.

A novel mechanism for automatic sizing of sago granules is presented in this paper with analytical and experimental studies. This automation method would help to overcome the difficulties faced in the conventional labor which is the intensive process of sago sizing. This paper mainly discusses the data required to define the particle trajectory and behavioral movement in shaping the sago granules. Mathematical models are prepared and experimental studies are performed for the instant at which the flight of particles will occur due to centrifugal flee force and for the trajectory of the particle dynamics for various rotational speeds of the bowl and inclined rod that is coupled to the bowl. The prepared range of inclination angle of the rod is 60° to 64° with the horizontal plane. The maximum flight velocity of particle with a maximum height for models and experiments is 9.81 m/s for the height of 46.43 mm and 9.8 m/s for the height of 43.12 mm. The total residence time of the particle inside the bowl diameter of 200 mm and height 50 mm is also determined numerically as 6 min 43 s and experimentally as 7 min 15 s for the initial radial position of the particle of 20 mm from the axis of rotation of the bowl. The results of analytical models are compared and validated with the experimental results and the analytical results coincide with experimental results with negligible amount of error.

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