December 12, 2022 at 9:15 amAnadi_MondalSubscriber
I am simulating conjugate heat transfer in a nuclear fuel pin. Heat is generated in the fuel pellet and transferred to the liquid. I got the converged result. Now I want to calculate the heat transfer coefficient and heat flux at the cladding outside surface which is in contact with liquid. While I tried to get the surface heat transfer coefficient, I see the heat transfer coefficient was negative. I set the reference temperature of 566.25K where the inlet temperature is also 566.25K. The bulk temperature of the liquid increased to 612.25K at the outlet.
HTC is dependent on the reference value. So, what should be the reference for this reference temp?
What may be the reason for getting the negative value of HTC and total heat flux even though the surface temperature is always greater than the bulk/inlet temperature?
Is there any other way to get heat transfer and HTC? I am using a k-epsilon model with a wall function for turbulence modeling.
December 12, 2022 at 10:45 amDrAmineAnsys Employee
Reference Temperature is user input an you should know better about that than we do. If nothing mentioned in experiments, publications, correlations you compre with, I will use either saturation temprature or inflow temperature.
Sign of HTC will depend on the temperature diffrence ( and hence on reference temprature) and the heat flux (inward/outwards).
- You must be logged in to reply to this topic.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- Suppress Fluent to open with GUI while performing in journal file
- Floating point exception in Fluent
- What are the differences between CFX and Fluent?
- Heat transfer coefficient
- Getting graph and tabular data from result in workbench mechanical
- The solver failed with a non-zero exit code of : 2
- Difference between K-epsilon and K-omega Turbulence Model
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- error in cfd post
© 2023 Copyright ANSYS, Inc. All rights reserved.