🚀 go-pugleaf

In article <11DEC199218025457@zeus.tamu.edu> i0c0256@zeus.tamu.edu (IGOR) writes:
>
>I am kinda of puzzled by this cold fusion thing but I have an open mind
>about it. The question I have is a question from a fluid mechanics
>person and not that of a (nuclear) engineer :
>
>How can one so precisely determine the amount of heat generated?
>have they been fluid flow studies about this ? that is computer generated
>calculation proving that what the sensor gets  is linked to a certain amount
>a heat on the cell side.
>I am working in two-phase flow ( I DO NOT use correlation) solving the 
>Navier-Stokes equation and I know that even phase change problem 
>(such as the one occuring in the boiling) is a bitch... how can people be
>so sure of the heat generated ? My reasoning comes from my total distrust
>of heat transfer coeficient used in nuclear engineering that are there
>to give an estimate and not a TRUE value ( since they are mainly used 
>for design purposes)...

     Energy balances are much easier than detailed flow calculations,
     especially when you aren't venting to the atmosphere. A seemingly
     good example of how to do so fairly accurately has been posted
     by Tom Droege regularly (in various incarnations).  Any more adverbs
     in the previous sentence, and I'll have to barf on my own prose.

     By the way, how do you do two-phase flow without correlations
     or constitutive relations based on correlations?

     Where do you get your computer?  Mine won't go that fast.
     People have difficulty computationally accounting for a single
     bubble interface, to say nothing of the generic interspersed
     turbulent two-phase flow.

     If you do have some magic approach, please tell me soon.  I'm finishing
     a dissertation on boiling two-phase flow calculations in cryogens
     using all sorts of averaging and jury-rigged constitutive relations.
     A more elegant approach would sure be appreciated.
     
                            dale bass
-- 
C. R. Bass                                          crb7q@virginia.edu        
Department of Mechanical, 
     Aerospace and Nuclear Engineering
University of Virginia                              (804) 924-7926