# Nusselt number calculation in Fluent

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 November 13, 2016, 12:57 nusselt number calculation in Fluent #41 New Member   SUDHEER Join Date: Nov 2016 Posts: 1 Rep Power: 0 i am doing the problem related to helical coil heat exchanger, after completion of simulation in ANSYS fluent soft ware i need to calculate nusselt number. how to calculate that in the fluent..???

 February 25, 2017, 16:59 Plotting nusselt number distribution of flow #42 New Member   Jeffrey Join Date: Feb 2017 Posts: 1 Rep Power: 0 Hi guys, I am currently simulating turbulent flow through heated axisymmetric passage with circular rib-turbulators. The flow is incompressible turbulent flow and the heated walls have a constant heat flux of 200000 w/m2. I have plotted the chart for temperature of the flow and now I want to plot the nusselt number distribution from said temperature chart. How do I proceed from there? Thank you.

 April 9, 2017, 17:02 nusselt number in cavity #43 New Member   mojtaba Join Date: Apr 2017 Posts: 1 Rep Power: 0 Hi. I want solve problem unsteady heat tansfer in 3d cavity. But i dont no how fluent calculate and display nu number?? And i want display nu number in differnt time. Plz help

October 8, 2017, 16:35
#44
New Member

Ashraful Alam
Join Date: Oct 2017
Posts: 2
Rep Power: 0
Hi, I'm new in Fluent and Heat transfer. I'm trying to simulate steady natural convection in an enclosure. My questions are:

I tried to calculate Nusselt number using Report>Surface integrals>Surface nusselt number. But the Nusselt number I am getting is absurd.Is there any way to calculate Nusselt number?

Also what is the characteristic length of that geometry?

Thank you!
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 November 15, 2017, 22:44 asking reference temperatur at convective heat transfer #45 Senior Member     teguh hady Join Date: Aug 2009 Location: Saga, Japan Posts: 222 Rep Power: 16 Dear All, I am trying to simulate laminar flow of forced convection heat transfer in plain pipe (constant temperature) in FLUENT 17.2. I am using periodic boundary condition. The Wall temperature is 17 C and the inlet is 27 C. I am confused with the reference value of temperature. Surface Nusselt Number in text book is 3.6. There are some deviation if I use different reference temperature. which reference temperature I use in this case? whether wall temperature or inlet temperature? Thank you best regards __________________ Now Or Never!!!

 April 9, 2018, 23:44 #46 New Member   sanjay sajeevan Join Date: Mar 2018 Posts: 10 Rep Power: 7 can you please tell me how to calculate nusselt number in the rectangular channel as you did please?

 September 7, 2018, 00:22 #47 New Member   Chandan Kumar Sah Join Date: Mar 2018 Posts: 2 Rep Power: 0 If the pipe has some kind of dimple or protrusion on its inner surface keeping the thickness of pipe constant everywhere. Then how to create a line for Total surface heat flux calculation? Thank you.

 September 7, 2018, 00:26 #48 New Member   Chandan Kumar Sah Join Date: Mar 2018 Posts: 2 Rep Power: 0 https://mcut-my.sharepoint.com/:i:/g...k-4BQ?e=pQLTDf Here is my Geometry file.

 February 5, 2019, 11:18 Gambit #49 New Member   Harshit Join Date: Oct 2018 Posts: 5 Rep Power: 6 I'd like to know if Gambit has been changed to some other software or has it been permanently dissolved in Ansys workbench?

February 5, 2019, 13:14
#50
Senior Member

Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,246
Rep Power: 63
Quote:
 Originally Posted by HarshitP I'd like to know if Gambit has been changed to some other software or has it been permanently dissolved in Ansys workbench?

Gambit has been discontinued for more than a decade. It is superceded by ICEM in Ansys.

If you like Gambit but not ICEM, I recommend to also look at Gridpro.

 February 6, 2019, 04:38 #51 New Member   Harshit Join Date: Oct 2018 Posts: 5 Rep Power: 6 Thanks for your reply. May I ask you your experience with both of these software, being a novice I don't have much knowledge as far as ICEM is concerned and GridPro is very new to me.

 February 6, 2019, 09:13 #52 Senior Member   Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,246 Rep Power: 63 I have a slight preference for Gridpro because it makes really nice smooth grids. But except for the grid smoother, all three have the same functionality when it comes to making block meshes. However, Gridpro doesn't do tet or polyhedral meshes. If you want a general purpose mesher, then ICEM is the better choice

 May 29, 2019, 06:29 Nusselt Number #53 Member   Mayank Join Date: May 2019 Location: India Posts: 30 Rep Power: 6 Dear Redlemon, I have simulate a 3d pipe Flow With length of pipe 2 m And inner and outer Diameter 0.02 & 0.025 m respectively. Now I input boundary condition at inlet with avg velocity calculated from reynolds no. due to double wall I have a wall-liquid ,wall-solid , wall. 1. I put heat flux = 0 for wall(outer) now my question is what is difference between wall-solid and wall-liquid? I have put Heat flux = 200 for both the wall (solid & liquid) as i want to put a insulation on outer wall and a constant heat flux condition....is this right? secondly for Nu calculation the reference area should be surface area of pipe length should be diameter of pipe and temperature should be bulk mean temperature. please reply , your help is highly appreciated.