# how to plot local nusselt number vs X/d (length) in fluent 18.1

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 LinkBack Thread Tools Search this Thread Display Modes
January 9, 2018, 07:14
how to plot local nusselt number vs X/d (length) in fluent 18.1
#1
New Member

waqar hazoor
Join Date: Oct 2017
Posts: 24
Rep Power: 6
hi all
can any body help me how to plot the graph shown in attached picture.

i am using ANSYS fluent 18.1

flat heated plate

circular air jet strikes the plat solution is converged temperature values i get are fine.

but dont know how to draw local nusselt number vs length at interface of solid and fluid

thanks.
Attached Images
 ppp.jpg (38.5 KB, 32 views)

 January 10, 2018, 07:54 #2 Member   Daniel Edebro Join Date: Feb 2016 Location: Gothenburg Posts: 39 Rep Power: 8 My two cents 1. Create a user line from r = 0 outward radially 2. Calculate local HTC using T_amb, T_wall and wall heat flux 3. Calculate local Nusselt using Nu = HTC(r)*L/k, where k is the conductivity of the fluid. I am guessing that length scale L is the diameter of the jet but that should be definied in your article

 February 1, 2018, 13:51 #3 New Member   waqar hazoor Join Date: Oct 2017 Posts: 24 Rep Power: 6 dear can you kindly guide me how to calculate the Nusstle number at a stagnation point in transition case, i want to plot Nusstle number vs Re to validate my case with others Far likes this.

March 27, 2018, 09:00
#4
Senior Member

vidyadhar
Join Date: Jul 2016
Posts: 137
Rep Power: 7
Quote:
 Originally Posted by DEd My two cents 1. Create a user line from r = 0 outward radially 2. Calculate local HTC using T_amb, T_wall and wall heat flux 3. Calculate local Nusselt using Nu = HTC(r)*L/k, where k is the conductivity of the fluid. I am guessing that length scale L is the diameter of the jet but that should be definied in your article

Dear Daniel,

can we use "Plot-->WallFluxes--->Surface Nusselt Number" to get local Nu, instead?

Thanks in advance!

March 27, 2018, 18:29
#5
Senior Member

Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 4,796
Rep Power: 56
Quote:
 Originally Posted by vidyadhar Dear Daniel, can we use "Plot-->WallFluxes--->Surface Nusselt Number" to get local Nu, instead? Thanks in advance!
Yes but you need to remember to set the reference temperature and length the reference values pane. If you have a variable thermal conductivity, I'm not sure how Fluent calculates the Nusselt number for those cases. Presumably it would use the the thermal conductivity of the wall adjacent cell but one would have to check and make sure. If your properties are constant, then no worries.

 Thread Tools Search this Thread Search this Thread: Advanced Search Display Modes Linear Mode

 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 OffTrackbacks are Off Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post roi247 FLUENT 4 October 15, 2015 13:41 hadii Main CFD Forum 0 August 18, 2015 17:33 aylalisa OpenFOAM Installation 23 June 15, 2015 14:49 [blockMesh] BlockMeshmergePatchPairs hjasak OpenFOAM Meshing & Mesh Conversion 11 August 15, 2008 07:36 andre OpenFOAM 5 June 23, 2008 10:37

All times are GMT -4. The time now is 02:14.

 Contact Us - CFD Online - Privacy Statement - Top