# helical coil heat exchanger

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

 June 8, 2013, 05:31 helical coil heat exchanger #1 New Member   Sarthak Nigam Join Date: Jun 2013 Posts: 7 Rep Power: 11 I am working on a helical coil heat exchanger ( Tube side : Helical coil and Shell: cylindrical) For solving the temperature profile in Fluent, which model should I use: Case -1: Both shell side and tube side flow is laminar. But as we know, secondary flow develop in helical coil due to centrifugal force. Because of these secondary flow should I use k-epsilon model or laminar model. Case-2: Shell side flow is turbulent and tube side is laminar. Which model should I use, K-epsilon or laminar. Case-3: Is there any way I can define different models for different flow patterns on tube side and shell side. please reply

June 9, 2013, 06:17
#2
Senior Member

Daniele
Join Date: Oct 2010
Location: Italy
Posts: 1,016
Rep Power: 25
Quote:
 Originally Posted by sarsam.9296 I am working on a helical coil heat exchanger ( Tube side : Helical coil and Shell: cylindrical) For solving the temperature profile in Fluent, which model should I use: Case -1: Both shell side and tube side flow is laminar. But as we know, secondary flow develop in helical coil due to centrifugal force. Because of these secondary flow should I use k-epsilon model or laminar model. Case-2: Shell side flow is turbulent and tube side is laminar. Which model should I use, K-epsilon or laminar. Case-3: Is there any way I can define different models for different flow patterns on tube side and shell side. please reply
Hi, I would go for laminar as a first try (both, shell and tube, case 1); you can then switch on k-epsilon for the tube side (RNG could be a good choice) and compare results.
Or you can use a transitional turbulent model, but take care to y+ values.
Case2: turbulent in shell and laminar in tube; same comment as above for the tube zone.

It is possible to simulate one zone with laminar model and one zone with a turbulent one.
Make 2 zones (shell and coil) in pre-processor, then in fluent, choose a turbulent model, but in cell zones, for the laminar zone, check the laminar box.

Daniele

 January 13, 2016, 06:00 helical heat exchanger #3 New Member   supriya mishra Join Date: Jan 2016 Posts: 1 Rep Power: 0 can u plzz tell me how to draw the helical shape tube in ansys dm.. plzzz reply..

 January 14, 2016, 03:02 #4 Senior Member   Join Date: Aug 2014 Location: UK Posts: 213 Rep Power: 11 Though you would find many tutorials for this and procedure might not differ from other 3D CAD softwares; however, generally you could draw a desired 3D (sketch) helix profile (originating from global origin) and a circle (or any planar shape that you would like) on either of the ends with it's centre at the termination of the 3D helix line.. sweep the circle while selecting the helix line as the path..

 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 [ANSYS Meshing] meshing for dual cell heat exchanger sandeep sethi ANSYS Meshing & Geometry 0 December 29, 2012 10:19 mozafarie ANSYS Meshing & Geometry 5 November 7, 2012 05:02 turbofx35 ANSYS 0 May 5, 2012 01:37 francois louw FLUENT 2 July 16, 2010 02:21 Mark CFX 6 November 15, 2004 15:55

All times are GMT -4. The time now is 01:49.