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

Draft tube and MFR/SG

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 3, 2003, 06:55
Default Draft tube and MFR/SG
  #1
nyatoto
Guest
 
Posts: n/a
Hi All,

I have modelled a stirred tank with a draft tube using MFR and SG approaches. The draft tube was located on the stationary frame and the unmatched boundary was at a radial distance of about 0.58 diameter of the tank. Now I want to reduce the diameter of the draft tube so that I can have a higher flow rate in the draft tube than that in the annulus. This means that I have two choices to make:

(1) The draft tube will be on the rotating frame or (2) The unmatched boundary will have to be moved closer to the impeller tip so that the draft tube remains on the stationary frame.

I have read somewhere that as for SG, the radial position of the unmatched boundary is not critical, but is is critical for the MFR approach (about 0.585 tank diameter).

Could some one kindly expalin to me the numerical implications of the two options.

Many thanks for your time.

Regards nyatoto

  Reply With Quote

Reply


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 Off
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 22:46.