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High Mach Errors in very slow flow model...???

Question asked by dink dinkler on Aug 9, 2011
Latest reply on Aug 10, 2011 by dink dinkler

Forgive the pen-name. I created this account long, long ago and can't seem to figure out how to change it.

 

I am doing some flow analysis for heat loss and flow profiles on a commercially available helical coil tube-in-tube liquid/gas heat exchanger.

Wow that was a mouthful.

If you couldnt follow that... just click on this. http://sentry-equip.com/Public/BrochuresandDataShee/DTC17.1.pdf

I am modeling a "Series 4" but have truncated the model to 4 coils vs. 16.

 

Well my mass and volumetric flow rates are super small and have been too low for even the vendor to spec out a total length that I need.

So I am trying to do a part level analysis and will later plan on doing a full system analysis too.

 

Well, now I am not only having SUPER slow CPU time, but I am getting some high mach errors which is rather curious.

 

Admittedly the size of the tubing may be oversized for the flow rates (programmatic decisions beyond my control), but I cant imagine that this is the culprit.

I'm stumped.

 

Thoughts?

 

 

 

BoundaryConditions.JPGCoilHEX.JPG

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