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Mixing with circulationpump

Mixing with circulationpump

Mixing with circulationpump

(OP)
I'm a student on a work placement and I've got the following question. In our company we use a circulationpump to mix a solution, and bring this solution on pH (batch proces without stirring).
I want to know how you calculate the minimal mixingtime to make this homogeneous.
Where can I find this or how to calculate this.

Many thanks

EvW

RE: Mixing with circulationpump

EvW - Presumably you are mixing a tank with the circulating pump.  You can get as detailed or as simple as time allows.  If your tank mixing seems fairly turbulent, consider it a stirred-tank and the rule-of-thumb is to wait for three turnovers to get 95% of a step change.  A 1000 gallon tank with 200 gpm pump would have a turnover every 5 minutes (1000/200) so that you'd need to wait 15 minutes to sample.  If the flow is low, say 50 gpm for a 20 minute turnover, you may need more than three.  You can imagine at a low flow that the liquid enters the top of the tank and flows downward at a leisurely pace.  A good improvement is to add a mixing eductor fairly cheaply to multiply the effective flow from the pump (usually by a factor of 5).  This increases the circulation flow in the tank and reduces the effective turnover time by a similar factor of 5.  Hope this helps. - IronMike

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