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

critical re

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 28, 2006, 04:06
Default critical re
  #1
jj
Guest
 
Posts: n/a
what is the critical reynolds in a pipe flow for both air and water?
  Reply With Quote

Old   July 28, 2006, 05:13
Default Re: critical re
  #2
Dr.Nick
Guest
 
Posts: n/a
It depends on a type of a flow. Say aprox. from 1600 up to 6000 (for Hogen-Poiseuille flow) But, it's just by heart.

  Reply With Quote

Old   July 28, 2006, 08:37
Default Re: critical re
  #3
Deepak
Guest
 
Posts: n/a
i thk 2000 is the critical Reynolds no.. for all pipe flows..below that laminar and above 3000 its turbulent..pls correct me if iam wrong..

thank you...
  Reply With Quote

Old   July 28, 2006, 12:54
Default Re: critical re
  #4
Mani
Guest
 
Posts: n/a
we're zooming in.... some number around 2300 is often quoted in textbooks as the critical Reynolds number (based on pipe diameter) for fully developed incompressible pipe flow

(don't remember which velocity is used to define that Reynolds number -- cross-sectional average or center velocity?)
  Reply With Quote

Old   July 28, 2006, 14:48
Default Re: critical re
  #5
sk
Guest
 
Posts: n/a
2300 is the most widely quoted critical Re number that I have seen too. But researchers have reported postposing the critical Re to 10,000 by making the inlet to the pipe smooth.
  Reply With Quote

Old   July 28, 2006, 23:06
Default Re: critical re
  #6
jj
Guest
 
Posts: n/a
for commercial pipes ,,,, re 2300-4000 transition occurs for all fluids(air and water)
  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
CRITICAL ERROR on installation OpenFOAM 141 nuovodna OpenFOAM Installation 19 March 22, 2010 23:36
Critical errors during OpenFoam installation in OpenSuse 11.0 amscosta OpenFOAM 5 May 1, 2009 14:06
Critical temperaturepressure of liquids for dieselFoam solver sebastian_vogl OpenFOAM Running, Solving & CFD 0 December 30, 2008 16:57
Critical errors gcc and icoFoam during installation of 15 quartzian OpenFOAM Installation 3 December 12, 2008 13:42
Help with Solving Critical Errors andrewlindsay OpenFOAM Installation 0 October 7, 2006 19:58


All times are GMT -4. The time now is 17:32.