CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

minor loss k values

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

LinkBack Thread Tools Search this Thread Display Modes
Old   July 31, 2000, 13:03
Default minor loss k values
clifford bradford
Posts: n/a
I'm doing a project where i have to specify some minor los values. i have source on these values but can someone tell me where i can find out the typical variance in these values. eg the loss coefficient for a 90 bend is 1.5+/- x. where can i find out what is x? thanks for you help
  Reply With Quote

Old   August 2, 2000, 17:58
Default Re: minor loss k values
Alton Reich
Posts: n/a

This is a very good question, and one that the Navy made me answer several many years ago while working at Electric Boat. I was able to obatin some data from a series of tests on 90 degree elbows that indicated that for new, clean pipe the vatiarion in K-factor is about 5%. Needless to say, the Navy made us assume that the variation was about 10% for flow calculation purposes

I'm not sure if this data is readily available. You might be able to contact fitting and valve manufacturers to find out if they have documentation on their test programs that would indicate variation in measured pressure drop data.

This really only applies to new, clean pipe. After it's been in service all bets are off. After a year there will be a big difference in pressure drop through an elbow that's in a chilled water system, and another that's in a system transporting raw sewage.

Regards, Alton Reich
  Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
TimeVaryingMappedFixedValue irishdave OpenFOAM Running, Solving & CFD 32 June 16, 2021 07:55
max node values exceed max element values in contour plot jason_t FLUENT 0 August 19, 2009 12:32
exact face values RubenG Main CFD Forum 0 June 22, 2009 12:09
strange node values @ solid/fluid interface - help JB FLUENT 2 November 1, 2008 13:04
node values or cell values? aPpA FLUENT 0 November 10, 2006 09:56

All times are GMT -4. The time now is 18:15.