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CFD can determine the flow rate and the Nq-value simply by determining the flow pumped through the inlets and outlet. In this case, the only thing we determine is the impeller design and the speed.
Notice the flow pattern is very pronounced in the inlet and outlet pipes, in the false bottom, and in the impeller. Everything else is very quiet, where drop coalescence can and will take place. Here is just one verification (proof) that the CFD computer simulation is very good indeed. To the left is data taken experimentally with a Laser at Lightnin. The data on the right was derived using the CFD Acusolve program. There is much more information that can be derived from the CFD.
Unlike other mixing impellers the SX pumper impeller creates head, like a pump. This can also be determined accurately with a CFD.
This picture shows the pressure distribution. From this we can determine the actual pumping head of the impeller. We can see how the fluid is sucked into the false bottom chamber and up to the pumper.
Power and Np are calculated through a routine. Keith Johnson has proven over and over again that the calculated power is within ±2% of the actual power draw, even in a continuous system like SX. Take a look at other CFD projects we have done. SX AnimationClick this title to continue with this article. [ Top of this page ] [ Beginning of article ]
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