# Doubling heat transfer (convection calculation)

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

 July 3, 2012, 12:03 Doubling heat transfer (convection calculation) #1 New Member   Join Date: Jul 2012 Posts: 2 Rep Power: 0 Sponsored Links Dear all, I have a problem with convection calculation on Fluent 13.0 I have a geometry (basically cylinder) with its surface heated to certain temperature and there is a boxed encloseure around the cylinder. Cold air goes in from inlet duct at the front of the encloseure and goes around the cylinder to cool the surface and goes out from outlet vent at the back of the enclosure. I am trying to calculate the convection around the surface of the cylinder. The calculated convection within CFD model was lower than I expected. This is because the surface area is lower than the actual model (it is more complicated and has more surface area) due to simplified geometry. f Thus, I would like to make CFD calculated convection between the cylinder's surface and airflow around the cylinder to be doubled within Fluent somehow (maybe using a UDF??) instead of making detailed geometry. Let's say heat flux or heat transfer coefficient from wall to fluid (air) needs to be doubled: q = q_convection + q_radiation q_convection = h_f(T_w-T_f) q_convection or h_f needs to be doubled to make the convection calculation doubled Is there any way to do that? I thought using DEFINE_HEAT_FLUX UDF may work, but I could not figure out. Please let me know if anyone know how to do this. Thank you. Last edited by ninjakid; July 3, 2012 at 12:11. Reason: typo

 Tags convection, fluent, heat flux, heat transfer, udf

 Thread Tools 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 On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post srinivasa FLUENT 21 November 11, 2016 07:08 mehrdadeng CFX 10 February 25, 2011 06:25 Lotta_questions CFX 3 February 11, 2010 19:35 max91 CFX 1 July 29, 2008 20:28 AB Siemens 6 November 15, 2004 05:41