CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

Sudden expansion

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 28, 2011, 02:28
Default Sudden expansion
  #1
Senior Member
 
Govindaraju
Join Date: Apr 2010
Posts: 206
Rep Power: 8
kmgraju is on a distinguished road
Dear friends
I have a question on fluid mechanics.



a 6cm dia pipe expands gradually to 9 cm dia pipe. walls of expansion section are angled 10 degree from the horizontal. if the flow exit from smaller to bigger dia pipe there is a flow separation in the downstream flow for certain length and then the flow becomes fully developed .
How to calculate exactly the distance from the start of expansion to the fully developed flow starts in the downstream flow?

Thanks

Regards
Govind
kmgraju is offline   Reply With Quote

Old   July 28, 2011, 02:33
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,662
Rep Power: 84
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
Put a line across the downstream flow and take a velocity cross section. Then push the line downstream until the velocity is fully developed to within a tolerance you specify.
ghorrocks is offline   Reply With Quote

Old   July 28, 2011, 11:27
Default sudden expansion
  #3
Senior Member
 
Govindaraju
Join Date: Apr 2010
Posts: 206
Rep Power: 8
kmgraju is on a distinguished road
Quote:
Originally Posted by ghorrocks View Post
Put a line across the downstream flow and take a velocity cross section. Then push the line downstream until the velocity is fully developed to within a tolerance you specify.
Thanks for your information. Is there any mathematical method to calculate where the flow starts to develop fully?

Thanks

Regards

Govind
kmgraju is offline   Reply With Quote

Old   July 28, 2011, 18:35
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,662
Rep Power: 84
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
What do you mean by mathematical? My description is mathematical.
ghorrocks is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need help. plzz (Axisymmetric Sudden Expansion) ruzfactor Main CFD Forum 0 November 26, 2010 19:21
problems in meshing sudden expansion and contraction with hex thinktank ANSYS Meshing & Geometry 4 June 16, 2010 16:05
Rarefied Flow through sudden expansion applemango Main CFD Forum 0 April 16, 2010 06:08
Meshing Sudden Contraction and Expansion carldaru ANSYS Meshing & Geometry 4 April 13, 2010 13:02
Pressure loss due to sudden expansion in pipe flow Ahmed FLUENT 0 January 2, 2006 11:01


All times are GMT -4. The time now is 08:19.