Learning Forum

[snr]

How to calculate the mass and heat transfer coefficients in ANSYS Fluent multiphase and multicomponent simulations.

[Supreetha J]

Hello,

Please refer to the following links on mass and heat transfer coeffecients. UDF is the easier way for the coefficient. 
27.8.3. Mass Transfer Coefficient (ansys.com)
27.8.2. Heat Transfer Coefficient (ansys.com)
If you are not able to access the link, please refer to this forum discussion: Using Help with links (ansys.com)

Thank you.

[snr]

 

I am seeking how to calculate the heat and mass transfer coefficients from simulation results.

 

[Supreetha J]

Mass transfer coefficient is a value that one will set to control the phase change. Heat transfer coefficient is based on the wall flux and temperature values near wall. We have HTC variables available. Please refer to this section of Ansys User's Guide 25.10. Postprocessing for Multiphase Modeling (ansys.com)
If this does not help, could you please provide more specifics on what exactly are you trying to model and the physics used?
Thank you.

[snr]

I am modelling the absorption of gas in a liquid. In this absorption process, I need to calculate the amount of mass that is transferred from gas to liquid  (due to concentration difference), which can be represented by the mass transfer coefficient. So I want to calculate the mass transfer coefficient along with the heat transfer coefficient.

[Prashanth]

Check out the mass-transfer-correlations Fluent has to offer here: 14.7.7. Interphase Species Mass Transfer

Check out the htc correlations Fluent has to offer here: 14.5.17.1.The Heat Exchange Coefficient

[snr]

I have incorporated these correlations into my simulation. Presently, I seek assistance in calculating the mass and heat transfer coefficients based on the simulation results. Could you please help me with this coefficients calculations?

[Prashanth]

Then you can just plot the mass-transfer-coefficient. It shows up under phase-interactions, in contours.

As for vol.htc, I think you need to somehow extract the Nu_p calculated by Fluent's correlation and insert it in the theory equation.

[snr]

Thank you for your answer. Are there any tutorials available that address the above problem you mentioned? Please let me know if you have any information to share. Thanks again!