October 26, 2018 at 5:39 amjhjangSubscriber
October 26, 2018 at 5:53 amDrAmineAnsys Employee
Are you using the skin friction coefficient and Nusselt number from Fluent? Here you need to tune the reference values to match your case.
October 26, 2018 at 5:58 amDrAmineAnsys Employee
Regarding the results we can only make an evaluation if you clarify the way you obtained the quantities. But the simple Reynolds Analogy tells that the Stanton number is half of the Friction coefficient.
October 26, 2018 at 8:27 amjhjangSubscriber
Thank you, sir,
yes, I am using skin friction factor and Nu number from fluent. Will the reference value change for the enhanced pipe? I use the pipe diameter for both smooth and enhanced pipe as the reference length and inlet area as the reference area during setup.
October 26, 2018 at 9:14 amjhjangSubscriber
sir, I am attaching my mesh and case and data file.
case 2 Re 1000 case and data file
case 2 mesh file
October 26, 2018 at 9:42 amDrAmineAnsys Employee
Yes the reference values are use to calculate the dimensionless number like L_ref, v_ref, roh_ref....Just check the manual.
I apologize but as ANSYS Stuff I won't look into the cases you are sharing. Be aware that you are sharing files on an open community.
October 26, 2018 at 9:58 amjhjangSubscriber
Is there any formula for laminar developing flow to calculate HTC, Nu?
Because i see some resources using (h=Q"/area*(tw-tm)), where Tw using maximum temperature at the wall and Tm as mass weighted avg. temperature
"(integration(velocity*temperature*radius)/integration(velocity*radius)) " at axial location z.
Is this formula for HTC be applicable to the laminar developing case?
October 26, 2018 at 10:59 amDrAmineAnsys Employee
The reference temperature to calculate HTC is always case dependent and might also depend on whehter you have exp. data or other cross-references. I generally use a mass-weighted Average of the temperature at the cross-section at position X where I want to get HTC. Others uses the inflow temperature or volume weighted temperature..
- 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.