🚀 go-pugleaf

In article <1992Dec11.171454.3158@magnus.acs.ohio-state.edu> kpearce@magnus.acs.ohio-state.edu (BULLDAWG) writes:

[discussion of boiling in nitrogen deleted]
>
>But at this point, the metal makes a phase transition from one kind of
>metal crystal to another (bcc to alpha).  Whenever a substance under goes
>a phase trnsition it gives up heat.  So what was happining was that the
>metal was bubbling away as it cooled down giving up heat in a straight-
>forward way and then at a centain temperature, the metal says "hey, I'm in the
>wrong shape, and I have too much energy" and then gives up that excess energy
>_in_addition_ to the heat energy it was giving up to begin with and then
>as soon as it makes the phase transition, the copper goes to cooling down as
>before (the bubbles slow down).

     So all metals have discrete phase transitions near the boiling point of
     nitrogen?   And these phase transitions involve increased cooling
     /increased heat transfer?

     I think you'll find that it is just changes in the heat 
     transfer characteristics of the metal/fluid interface down near 
     the boiling incipience point that are the real cause.  

     See my earlier posting for details.

                             dale bass
-- 
C. R. Bass                                          crb7q@virginia.edu        
Department of Mechanical, 
     Aerospace and Nuclear Engineering
University of Virginia                              (804) 924-7926