From the graph the relationship between residence time cycles, speed feed rate of 1 kg/min and 0.5 m/s wind speed the rotation speed is increased from 3 to 5 rpm residence time values. Is reduced by a linear relationship does not exist? During the decline of the rotation speed 3 to 4 rpm is reduced dramatically and the time of residence in the range 4-5 rpm are decreased only slightly, so the residence time will be less change in the higher cycle. Rotating speed influence very low cycle time, and the residence will be closer to a fixed value or the value limit at higher rotation speed.
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