Several alpha equations with phase change -- CFD Online Discussion Forums

September 30, 2020, 07:10

Several alpha equations with phase change

Huihui Xiao

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Join Date: Mar 2020

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Hello all,

I am a new begineer of Openfoam with evaporation. After reading some literature, and I found we have sevaral different alpha equations, please see the attached picture.

Actually, the eqn.(1) is used in the well-known 'evapVOFHardt' solver.

eqn.(2) is used in the interPhaseChangeFoam.

eqn.(3) is used in some paper, e.g. ''https://www.sciencedirect.com/science/article/pii/S0021999113003197''

One thing I do not understand well is that in eqn.(2), we can substitute the divU equation into the alphaEqn and we can thus have eqn.(3), is that correct?

I am looking forward to hearing your suggestions on this issue. And please let me know which one is correct and best for droplet evaporation simulations.

Many thanks

Attached Images

alphaEqns.PNG (46.2 KB, 46 views)

ndtrong likes this.

Tags

evaporation, phase change, vof

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