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

Doubts in pipe turbulent flow theoretical analysis calculation

Register Blogs Community New Posts Updated Threads Search

Like Tree2Likes
  • 1 Post By LuckyTran
  • 1 Post By LuckyTran

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 3, 2018, 16:41
Unhappy Doubts in pipe turbulent flow theoretical analysis calculation
  #1
New Member
 
Aakash
Join Date: Aug 2018
Posts: 3
Rep Power: 8
Ajithmahi is on a distinguished road
Hello,

I need to analysis the pipe routings by theoretically, I have done some major loss (Darcy Weisbach eq) and minor loss fittings calculation.

But I don't know the exact calculations becuase I am not an expert in fluid mechanics.

I have attached image please look at that, give me your golden suggestions

Please help me to move forward.
Attached Images
File Type: png Theoretical Analysis.PNG (19.0 KB, 24 views)
Ajithmahi is offline   Reply With Quote

Old   August 3, 2018, 16:50
Default
  #2
Senior Member
 
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,747
Rep Power: 66
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
You just write a system of equations in terms of the major and minor losses.

But your system is under-defined at the moment. You need to know the flow splits or the pressures at the outlets to solve this problem. E.g. where you have flow & pressure? at each outlet, you need to know one or the other for each.
Ajithmahi likes this.
LuckyTran is offline   Reply With Quote

Old   August 3, 2018, 17:58
Default
  #3
New Member
 
Aakash
Join Date: Aug 2018
Posts: 3
Rep Power: 8
Ajithmahi is on a distinguished road
Thankyou for quick response luckytran,

Actually i want to find that things.

For example how i am expecting :

inlet 60 lpm it has some static pressure and additionally we given 1 bar pressure at inlet.

it moves towards the outlet with some major and minor losses, so i have assumed to subtract the losses. eg. 1 bar pressure it will decrease to 0.4 bar due to friction and fittings.

and also we need to apply

pressure energy
Potential energy for lift to outlet 3.
Bernoulli's equation.
etc.

may we can assume in all outlet is atm pressure.

Thanks
Ajithmahi is offline   Reply With Quote

Old   August 5, 2018, 20:01
Default
  #4
Senior Member
 
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,747
Rep Power: 66
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
Quote:
Originally Posted by Ajithmahi View Post
may we can assume in all outlet is atm pressure.

Right... you need to know something more. Otherwise, knowing only the inlet conditions is not enough. Can you assume all the outlets are at atmospheric pressure? I don't know, you are the one specifying the problem.
LuckyTran is offline   Reply With Quote

Old   August 6, 2018, 06:01
Default
  #5
New Member
 
Aakash
Join Date: Aug 2018
Posts: 3
Rep Power: 8
Ajithmahi is on a distinguished road
Could you please briefly explain, What is the approach & what is the input required to solve this kind of problem?
Could you tell me some sample example problem?

That would be very useful to me.

Thanks in Advance.

Last edited by Ajithmahi; August 7, 2018 at 04:35.
Ajithmahi is offline   Reply With Quote

Old   August 8, 2018, 16:18
Default
  #6
Senior Member
 
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,747
Rep Power: 66
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
I've written it twice already. Repeatedly asking the same question won't make me change my answer...

You have three outlet pipes. You need to know the pressures at each outlet. Maybe they are all equal and all atmospheric, maybe they are different. They are something.

Or you need to know the flowsplits. I.e. does is it 1/3, 1/3, 1/3 or maybe 1/5, 2/5, 3/5, or whatever.
Ajithmahi likes this.
LuckyTran is offline   Reply With Quote

Reply

Tags
calculation, cfd - post, fluid mechanics, formulas, theoretical


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
3D pipe flow - Using UDF's to define fully developed turbulent flow on the inlet Taz-CFD CFD Freelancers 1 February 21, 2016 12:12
3D pipe flow - Using UDF's to define fully developed turbulent flow on the inlet Taz-CFD ANSYS 0 February 19, 2016 08:49
Erosion of turbulent flow in pipe claudy.daniel FLUENT 0 September 8, 2015 11:10
Roughness in turbulent pipe flow 1000sh Main CFD Forum 3 April 11, 2010 10:00
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 10:11


All times are GMT -4. The time now is 16:11.