Nucleation Undercooling

Exchange about the physics background, diffuse interface theory, etc..
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kmukherj
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Nucleation Undercooling

Post by kmukherj » Thu Feb 25, 2021 1:13 pm

Dear Expert,

I want to understand the nucleation strategy in MICRESS. What I understood, it is controlled by the parameter 'undercooling'. The equilibrium temperature is based on planar interface. But for nucleation we have a heavily curved interface. Undercooling is required to create the curved interface.

So, my question is how to quantify the value of required undercooling ?

Thank you,
Regards,
Krishnendu

Bernd
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Joined: Mon Jun 23, 2008 9:29 pm

Re: Nucleation Undercooling

Post by Bernd » Mon Mar 01, 2021 1:06 am

Dear Krishnendu,

In MICRESS, you have the choice between two basic nucleation models, the seed_density model and the "seed_undercooling" model. While the first uses the density distribution of seed particles, and thus is based on curvature, the second indeed is based on thermodynamic undercooling. However, if used for nucleation at interfaces, the curvature of the substrate is automatically added to the nucleation undercooling.
Nevertheless, the value for the undercooling you specify is empirical and typically cannot be obtained from any theoretical model.

Bernd

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