How can I calculate my power number and power required for two different impellers? I have a solid suspension mixing tank with two different types of impellers but same size as below. Vessel: diameter = 510 mm, height = 710 mm, dished bottom Impeller: one 3PBT45 at bottom and 3-blade paddle at top both diameter = 165 mm, different height = 360 mm Shaft diameter = 35 mm Rotational speed around 1,400 rpm liquid density = 1000 kg/m3 solid density = 8000 kg/ m3 mixing ratio is 2:1 viscosity = 1 mPas
Topic: How can I calculate my power number and power required for two different impellers?13 December 2011
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Dave Dickey Forum Moderator 245 Posts
Re: How can I calculate my power number and power required for two different impellers?13 December 2011 at 1:29pmThe power number for the 3PBT45 impeller is 1.19.
The power number for the 3-blade paddle impeller is 3.28.
Both 165 mm diameter impellers are assumed to have blade widths of 33 mm.
A 2:1 mix of 1000 kg/m3 liquid and 8000 kg/m3 solids is a 3.33 kg/ m3 slurry.
The power required for the mixer is 30 KW total with both impellers.
The total power for both impellers is the sum of the two impellers separately.
The shaft diameter needs to be 50 mm, not 35 mm
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