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Topic: What is the most suitable design for motor power, shaft, and impeller?

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I have a 1,000 L square tank with these dimensions: width 0.9m, length 1.1m,  height 1m. I want to use as mixer for liquid detergent industries where viscosity is between 1,000-3000 mPas at 20c temperature. What is the most suitable design for motor power, shaft, and impeller?
  • Avatar Dave Dickey Forum Moderator 285 Posts

    Re: What is the most suitable design for motor power, shaft, and impeller?

    A 1kW mixer rotating a 300 rpm, with either a 0.3 meter diameter pitched-blade turbine or a 0.38 meter diameter hydrofoil should be sufficient.

  • Avatar yaniv sharabi Community Member 2 Posts

    Re: What is the most suitable design for motor power, shaft, and impeller?

    What if I'm using it to mix carwash high-foaming detergent (viscosity up to 2500 mPas) ? I have seen a mixer for this application with two(2) two-blade, 45-deg, pitched-blade impellers, 0.75 m in diameter with 0.05m wide blades . Two speeds: 50 rpm (for foam) & 110rpm (for degrizer). Would you recomend the same? any improvments? what kind of engin will i need ?
  • Avatar Dave Dickey Forum Moderator 285 Posts

    Re: What is the most suitable design for motor power, shaft, and impeller?

    This mixer will provide more mixing intensity than can be handled in an IBC container, especially without a top cover.  The IBC container is short enough that two (2) pitched-blade impellers would be difficult to position effectively.  The upper impeller will contribute to splashing and foaming, especially in the detergent.  One (1) four-blade pitched-blade impeller will be more than adequate and should be placed about 0.3 meters from the bottom.  A single four-blade pitched-blade 0.6 meters in diameter is more than adequate to mix the contents.  Even at 50 rpm, the mixing will be vigorous for a small tank.  At 110 rpm, the mixing intensity will probably be more than can be handled in an open container.  A 2.5 kW motor is appropriate for the 0.6 meter diameter impeller.  Larger impellers, 0.75 meters in diameter will overload a 2.5 kW motor.