Hi,everyone,
Can you explain the physical meaning of shielding time and shielding distance?
Thank you.
shield time and shield distance
Re: shield time and shield distance
Dear Jane,
When nucleation happens, the latent heat of phase transformation will locally heat up the material, so that for a certain time there will be no further nucleation happen up to a certain distance around this seed.
The use of a shield distance and shield time in the nucleation input is a pragmatic approach which resembles this behavior in simulations which do not explicitly include latent heat release and heat diffusion. Practically, it allows for adjusting nucleation parameter such as to realize a given density of precipitates (which may be known from experiments).
Bernd
When nucleation happens, the latent heat of phase transformation will locally heat up the material, so that for a certain time there will be no further nucleation happen up to a certain distance around this seed.
The use of a shield distance and shield time in the nucleation input is a pragmatic approach which resembles this behavior in simulations which do not explicitly include latent heat release and heat diffusion. Practically, it allows for adjusting nucleation parameter such as to realize a given density of precipitates (which may be known from experiments).
Bernd