next up previous contents
Next: Conduction time in the Up: Atomization time Previous: Atomization time

Conduction time (die mold)

= 0.4
Figure: Schematic of heat transfer processes in the die
The governing equation the heat transfer for die reads
    (3.13)

To obtain the characteristic time we dimensionlessed the governing equation and present it with a group of constants that determine value of of the characteristic time by set it to unity. Lets define
    (3.14)


  the characteristic path of the heat transfer from the die inner  surface 

to the cooling channels
subscript
B boiling temperature of cooling liquid
M liquid metal melting temperature

With these definitions equation ([*]) is transformed to

    (3.15)

which leads into estimate of the characteristic time as
    (3.16)

Note the characteristic time is not effected by the definition of the . discussion about the typical estimates and how to calculate it
next up previous contents
Next: Conduction time in the Up: Atomization time Previous: Atomization time   Contents
Genick Bar-Meir ||| www.potto.org
copyright Dec , 2006

The pdf version is also available here