CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

Nusselt number on the cylinder

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   April 26, 2021, 09:24
Default Nusselt number on the cylinder
Join Date: Mar 2021
Posts: 63
Rep Power: 3
Techies is on a distinguished road
Hi everyone,
I 'm trying to calculate Nusselt number on the cylinder surface in CFD post. But I got one problem, when i calculate Nu ave on the cylinder surface, i use
h=Heat Flux/(Temperature-Tbulk)
Nu=h*0.0235[m]/0.0254[W m^-1 K-1]

with x is my cordination of cylinder, -0.4846 inlet, 0.872=(inlet->outlet)
0.0235: hydraulic diameter, 0.0254: thermal conductivity
My problem is the result from this which is negative, whereas my areaAve temperature on the cylinder is higher than Tbulk. My heat flux is positive, Temp out is higher than temp in.
Please, Anyone calculated the Nusselt on the cylinder(or Pin-fin) can help me understand and fix this problem.
Thanks .
Techies is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
[General] Extracting ParaView Data into Python Arrays Jeffzda ParaView 19 June 11, 2020 15:54
Foam::error::PrintStack almir OpenFOAM Running, Solving & CFD 90 October 3, 2019 07:01
[mesh manipulation] Importing Multiple Meshes thomasnwalshiii OpenFOAM Meshing & Mesh Conversion 18 December 19, 2015 18:57
simpleFoam parallel AndrewMortimer OpenFOAM Running, Solving & CFD 12 August 7, 2015 18:45
SigFpe when running ANY application in parallel Pj. OpenFOAM Running, Solving & CFD 3 April 23, 2015 14:53

All times are GMT -4. The time now is 05:57.