H/D Ratio of Mixing Tank

[PW2006]

I am trying to design a liquid mixing tank. The mixing tank volume is about 80 cubic meters. We add powders to the liquid. The specific gravity of the mixed liquid is around 1.6. Its viscosity is about 140 SSU. We normally don't use impeller mixer. We recirculation the liquid and use a few submerged jets.

Based on your experience, generally speaking, what should the best or better height/diameter ratio of a mixing tank be?

Are there some articles about this issue?

Thanks.

 

[gr2vessels]

pw,
Your problem is not uncommon, the velocity of the fluid in the tank is the issue, for the mechanical stability of the tank. Keep your "jets" , but the mixing requires relative high velocities for the mentioned viscosity. You'll probably need a flat tank, ie D/H of 1.2 - 1.4. This obviously comes to a cost, the jets you are using have to generate the velocity over the 0.5 m/s and you need to ensure the tank will stand for the dynamic loads. I assume that you don't have much of the clue for the tank design, hence I suggest to talk to a tank designer to help you with a specification for your requirements.
cgeers,
gr2vessels