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Old Mar 9th 2011, 04:07 PM   #1
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Volumetric flow rate of mixture in mechanically stirred tank

Find the volumetric flow rate of a mixture and sodium chloride concentration in the exiting stream at steady state.

I have the volumetric flow rates of the incoming streams of different NaCl concentrations and mass concentrations of sodium chloride concentration.

F1= 10000L/s
C1=20.0mg/L

F2= 5000L/s
C2= 40mg/L

how would I go about finding the volumetric flow rate of the mixture in a mechanically stirred tank an the NaCl concentration in the exiting stream at steady state? Thank you for any help you can give me.
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Old Mar 10th 2011, 06:28 AM   #2
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If I understood well... if there is a certain amount flowing in, there should be the same amount flowing out.

For the concentration now. Both will mix to give some concentration C, in a volume V (which you got as the exiting flow rate).

Concentration times volume gives you mass. And the rate on inflow of mass should be the same as the rate of outflow of mass.

Hence,

C1V1 + C2V2 = CV

Divide by units of time,

C1F1 + C2F2 = CF
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