Learning Forum

[yusuf uzun]

Hi,

I am using Semi-Mechanistic Boiling Model. It says,  in theory guide, that the nucleate boiling heat transfer coefficient is calculated using the Forster and Zuber correlation. There are several fluid properties in this correlation. At what temperature are these properties calculated? Bulk temperature or something.

[Rob]

I'm fairly sure most are wall or near wall cell values, but if it's not clearly stated in either the manual or references I'm not able to comment in detail. You may want to read the 24R1 Fluent Beta options too. 

[yusuf uzun]

There is no explanation about at what temperature the liquid properties are calculated( thermal conductivity, density, viscosity...) in Theory or User Guides.

[Rob]

Check the model advanced settings - it's based on those. 

[yusuf uzun]

Do you mean the section that i marked at image. If so, I don't know what and how to check.

[Rob]

To the left of the highlighted block - Boiling Model Reference Quantities. 

[yusuf uzun]

Theory Guide says that Reference Velocity and Temperature variables are used to calculate Reference Reynolds Number. Theory guide does not say the same thing about Forster and Zuber correlation.

[Rob]

Looks like there are a few places to get the various equations & notes, and not every model will be specifically mentioned in every place.