I have a tank that is 5 meters diameter and 7.5 meters tall. The bottom is flat. The liquid is water. The solid is small metal oxide particles very easy to suspend. Settling time is more than minutes. Would like to build a mixer for suspension only (not vigorous mixing).
Question: 1. What mixer diameter do I need? 2. What RPM? 3. What shaft diameter needed? 4. What HP do I need? 5. Do I need bottom shaft support and bearing?
Have an insight or suggestion?
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Re: Can you help me size a mixer?
27 July 2010 at 1:29pm- Mixer diameter - 1.0m diameter impeller
The impeller needs to be an axial flow impeller, like a 4-blade, 45-deg, pitched blade impeller. The tank must have tank baffles to prevent swirling and to lift and circulate particles. Typical baffles: 4 plate type baffles, each 0.4m wide and approximately the length of the straight side. - Rotational speed: 45 rpm
- Shaft diameter: 51mm
- Power required: 1.0 kW, 0.75 hp
- A bottom shaft support is not required for natural frequency (critical speed), but a bottom support will reduce the required shaft diameter to 38 mm.
- Mixer diameter - 1.0m diameter impeller
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