MuCool Absorber Review meeting Fermi Lab, 12

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MuCool Absorber Review meeting Fermi Lab, 12 13
August 2002 Flow and thermal simulation By Wi
ng Lau Stephanie Yang Oxford University
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Two Thermal models that we have looked at
The flow rate dependant Force Flow model
The Convective Flow model
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The Force Flow model- Current FE software we
have at Oxford is adequate to deal with this type
of thermal analysis 2-D model 3-D models are
working well. Computing power required for the
3-D model is several order of magnitude larger
than that required for the 2-D model. Preliminary
results show that at 5m/s, the LH2 provides a
good cooling surface to the centre of the window.
There is a dead zone at the crotch corner of
the Bellow window which needs additional mixing
to prevent LH2 from boiling in this area
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The Convective analysis Detail examination of
the results show that the gravity effect was
absent from the analysis, hence the lack of any
re-circulation and thermal mixing Further
discussion with the software supplier revealed
that this was indeed a deficiency of the software
on this particular feature We have since
switched to another software for the convective
flow analysis The new software is called CFX-5.
It is fully capable for 3-D modelling. We have
since installed the programme in our network
drive and Stephanie is working hard to ensure
that we have further results to show at the next
meeting Our first task is to simulate what KEK
have done to see if the two results tie up We
are confident that this is the right tool for
this type of analysis