Dave Dickey Forum Moderator 305 Posts
Re: How do I improve mixing in the drum?30 May 2012 at 1:29pm
This question does not provide much useful information about the existing mixer that does not work. Without an impeller diameter, impeller type (number of blades, blade shaper or angle, etc.), and rotational speed the existing mixer cannot be evaluated. In any case, the important limitation is the maximum torque of the magnetic drive. The most effective mixer will be the one that most nearly loads the torque capability of the magnetic drive.
Without any additional information, the best advice is to use a properly sized (for maximum drive torque) hydrofoil impeller located about 100 mm from the bottom of the drum.
The answers by this expert are based on the best available interpretation of the information provided. The consequences of the application of this information are the responsibility of the user. If clarification is needed, please submit a further question.
I have a drum of dimensions ~460 mm height, ~400 mm diameter with a dished bottom. There is a top-mounted magnetically driven impeller, with a very small clearance from the bottom in the drum (~4mm). I would like to improve mixing in the drum as the current system is inadequate. The material settled at the bottom of the drum starts with a viscosity of up to 4,000 cP and when properly sheared and mixed should re-suspend to a viscosity and density close to that of water. Can you recommend the best type of impeller for the system? We are constrained to the magnetically driven system and to the absence of baffles. There is one long sample pipe which acts as a baffle in the drum.
Have an insight or suggestion?
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