laminar flow in circular pipe

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

 January 1, 2009, 12:57 laminar flow in circular pipe #1 MLA Guest   Posts: n/a Hey! I'm looking for a test case to verify my code. I used FVM(fortran code) to simulate a laminar flow in pipe can any one help or send me a paper? Thanks in advance

 January 1, 2009, 19:25 Re: laminar flow in circular pipe #2 otd Guest   Posts: n/a Hagen-Poiseuille flow through a pipe for flow downstream of the inlet section. The flow is independent of z there (at least until turbulence sets in). The axial velocity is parabolic, w(r, z), where r is the radial coordinate. Use mass converation to learn that the CL axial velocity is 1.5 x the average axial velocity. My old version of Schlichting (Boundary Layer Theory) has it all worked out. For the entrance region flow, find some data (friction factors?). Compare the CL axial velocity w(r = 0, z) from your calculation with the data.

 January 3, 2009, 12:41 Re: laminar flow in circular pipe #3 MLA Guest   Posts: n/a dear otd thanks for your message.but there is a little problem in parabolic velocity i.e. the coeficient is depend on pressure drop which is unknown befor solving the problem! as you know the inlet and outlet bc's are velocity inlet and prresure outlet .thanks again

 January 3, 2009, 23:06 Re: laminar flow in circular pipe #4 versi Guest   Posts: n/a The pressure drop may be given a-priori. Inlet BC: Pressure = given, u-component = extrapolated according to du/dx=0, v-component =0, Outlet BC: pressure =0.0, d(u,v)/dx=0

June 27, 2012, 09:53
#5
Senior Member

Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 128
Rep Power: 5
Quote:
 Originally Posted by MLA ;58387 Hey! I'm looking for a test case to verify my code. I used FVM(fortran code) to simulate a laminar flow in pipe can any one help or send me a paper? Thanks in advance
Hi, Did you find a paper? Could you please email me the paper, I am using FVM (fortran code) to simulate a laminar flow in pipe. Could you please answer my following questions:

Also, how I will calculate the inlet and outlet pressure? I have used parabolic velocity profile and my velocity and pressure graph looks correct.

Also, how I will calculate the Nusselt number? (Looking for a fortran code)

Goutam

July 1, 2012, 17:55
#6
Senior Member

Chris DeGroot
Join Date: Nov 2011
Posts: 387
Rep Power: 6
Quote:
 Originally Posted by Goutam Hi, Did you find a paper? Could you please email me the paper, I am using FVM (fortran code) to simulate a laminar flow in pipe. Could you please answer my following questions: Also, how I will calculate the inlet and outlet pressure? I have used parabolic velocity profile and my velocity and pressure graph looks correct. Also, how I will calculate the Nusselt number? (Looking for a fortran code) Thanks for your time. Goutam
Hi. You don't need a paper. Just check any basic fluid mechanics textbook and you will find a formula for dp/dx (or derive it quite easily). Since dp/dx is constant, the pressure profile is a line. Assuming you specified an outlet pressure you can find the correct pressure anywhere else.

July 2, 2012, 07:11
#7
Senior Member

Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 128
Rep Power: 5
Quote:
 Originally Posted by cdegroot Hi. You don't need a paper. Just check any basic fluid mechanics textbook and you will find a formula for dp/dx (or derive it quite easily). Since dp/dx is constant, the pressure profile is a line. Assuming you specified an outlet pressure you can find the correct pressure anywhere else.
Hi

For my case, I use water as fluid for laminar pipe flow problem. I found that flow is fully developed from inlet to outlet since I used parabolic velocity profile at the inlet. Also pressure is decreasing from inlet to outlet. Problem is my pressure drop profile is not linear and I calculated the friction factor which is not good at all. (Analytical result: f = 64/Re). But my velocity profile is fully correct. But when I use air as a fluid, then all my results were correct.

Thanks

 July 3, 2012, 13:06 #8 Senior Member   Goutam Saha Join Date: Dec 2011 Location: UK Posts: 128 Rep Power: 5 My problem is solved and I am now getting the correct pressure drop results. Only problem remains is the Nusselt number !!!!!!!!!

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post goodegg Main CFD Forum 12 January 22, 2013 12:47 manuel OpenFOAM Running, Solving & CFD 6 March 24, 2007 19:23 kevin FLUENT 7 June 8, 2006 01:19 Maria Phoenics 8 November 27, 2001 12:26 ram Main CFD Forum 5 June 17, 2000 21:31

All times are GMT -4. The time now is 02:32.