The graph of the relationship between residence time and rotation speed. The feed rate of 1 kg / min, and the wind speed 0.5 m / s rotation speed is increased from 3 to 5 rpm the residence time is reduced by a linear relationship. During the reduction of the rotation speed of 3 to 4 rpm, with a decrease in the residence time greatly and ranges from 4 to 5 rpm are reduced so little residence time will change into a round higher. Speed spin cycle to influence the very low residence time and will close or limit the constant rotation speed increases.
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