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

Flow in an annulus

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 17, 2008, 12:07
Default Flow in an annulus
  #1
JW
Guest
 
Posts: n/a
I have flow in an annulus. The flow enters perpendicular to the annulus and exits perpendicular also. The behavior I am seeing is when I vary the nozzle size, 2",4",6", I am obtaining counter-intuitive results. With the larger diameter nozzles at the entrance and exit, I am receiving larger pressure drops. It would make sense that the smaller the diameter, the higher the pressure drop. I've tested both constant velocities and constant volumetric flow rates through the various size nozzles. I have also obtained k-values (minor loss coefficients), and can accurately predict the pressure drop varying flowrates, but again still counter-intuitive with respect to nozzle diameters.

Is there some anomaly with annular flow that causes this or is something inherently wrong with my models?

If anyone has any insight, it would greatly be appreciated.

Thanks.

  Reply With Quote

Old   August 20, 2011, 03:34
Default HELLPPP URGENTLY PLEASE help me i have a meeting coming up PLEASE ANYONE
  #2
New Member
 
zikkie
Join Date: Aug 2011
Posts: 3
Rep Power: 5
zikkie is on a distinguished road
PLEASE I AM TRYING TO MODEL ANNULAR FLOW USING FLUENT
AND CONSTRUCTING GEOMETRY GAMBIT


how do i construct and mesh this geometry in gambit
please anyone help me

axial length = 0.00054 m
Outer Diameter = 0.01245 m
inner diameter = 0.012425 m
annular gap = 2.5 E-05 m

I AM ASSUMING TURBULENT

THANK YOU
zikkie 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
Fully Developed Flow in Star-cd SMM STAR-CD 0 September 5, 2011 22:08
flow in annulus M FLUENT 2 July 16, 2007 09:49
3D Buoyancy driven flow in annulus Aditya Main CFD Forum 0 February 20, 2007 02:21
potential flow vs. Euler flow curious ... Main CFD Forum 23 July 21, 2006 07:40
Plug Flow Franck Main CFD Forum 3 September 4, 2003 05:57


All times are GMT -4. The time now is 22:36.