Is it better to increase the rotational speed, or to increase the blade diameter?
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Kettle DN1800, two liquid phases; viscosity 60–100, density 1.2. A solid is formed as a result of the reaction, accounting for about 1/3 of the total mass. Axial flow mixing using airfoil-shaped impellers, with a rotation speed of 110. The original design did not provide good mixing effects. For a tank like this whose purpose is merely to achieve mixing, should I increase the rotation speed or the diameter of the impellers? What is the maximum blade diameter that can be used for the tank of DN1800?
110 revolutions per minute – that’s already quite fast. An increase in the blade diameter increases the load on the reducer and motor, requiring a replacement of the motor.
Replaced the motor; changed from 7.5 to 11
Increase the RPM. The paddle blades are larger, so the motor and gearbox need to be replaced.
The motor power has increased – is the original shaft diameter sufficient? The motor power has increased; by how much can increasing the paddle diameter help? How much more can increasing the speed increase it? How much more can the mixing effect be improved? Personally, I think it’s better to leave such issues to the mixing machine manufacturers to handle
Personally, I tend to increase the propeller diameter and then use a motor with higher power depending on the operating conditions.