July 21, 2023 at 1:31 amWEI LISubscriber
Hello Ansys experts,
I am modeling a wall surface reaction. Consider the chemical reaction ongoing on a surface is A (species in fluid) + B (site species) --> C (solid species);
If I understand correctly, Ansys Fluent computes the reaction rate by R=k*c(A)*c(B), where k is the reaction constant, c(A) is the molar concentration in fluid in the unit [kmol/m^3] and c(B) represents the site density in the unit [kmol/m^2]. Neither the backward reaction nor coverage dependence was considered in this context.
k and c(B) are both just inputs from me, and they are not changing throughout the simulation period if I understand correctly. Notice that the temperature exponent and activation energy for reactions are both zero in the current simulation.
My question is
- how Ansys Fluent selects c(A). Is it the molar concentration at the cell adjacent to the reaction surface?
- If my understanding above is correct?
Thank you and regards
July 25, 2023 at 6:36 amSwathi V. V.Ansys Employee
Please refer to the following user manaul page to know how rate of reaction is computed for surface reaction. Please refer to the equation 7-54.in 7.1.2. Wall Surface Reactions and Chemical Vapor Deposition (ansys.com)
C(A) is the Molar concentration of surface absorbed gaseous species on the wall
July 25, 2023 at 10:15 pmWEI LISubscriber
Thank you for your reply. However, I am still not quite sure about the difference between the molar concentration of surface-absorbed gaseous species on the wall and that at the cell adjacent to the wall.
The below image shows the molar concentration of A near the target wall. Can I say c(A)=5.7e-16 kmol/m^3?
Thank you and regards
July 26, 2023 at 1:10 amWEI LISubscriber
Also, I think it should be [Gi] instead of [Ci] in the equation 7-54.in 7.1.2. Wall Surface Reactions and Chemical Vapor Deposition (ansys.com), right?
- You must be logged in to reply to this topic.
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
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.
- Floating point exception in Fluent
- What are the differences between CFX and Fluent?
- Heat transfer coefficient
- Difference between K-epsilon and K-omega Turbulence Model
- Getting graph and tabular data from result in workbench mechanical
- The solver failed with a non-zero exit code of : 2
- Suppress Fluent to open with GUI while performing in journal file
- Mesh Interfaces in ANSYS FLUENT
- Time Step Size and Courant Number
- error: Received signal SIGSEGV
© 2023 Copyright ANSYS, Inc. All rights reserved.