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January 1, 2009, 12:57 |
laminar flow in circular pipe
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#1 |
Guest
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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
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January 1, 2009, 19:25 |
Re: laminar flow in circular pipe
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#2 |
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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. |
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January 3, 2009, 12:41 |
Re: laminar flow in circular pipe
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#3 |
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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
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January 3, 2009, 23:06 |
Re: laminar flow in circular pipe
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#4 |
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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 |
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June 27, 2012, 10:53 |
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#5 | |
Senior Member
Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 131
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Quote:
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 |
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July 1, 2012, 18:55 |
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#6 | |
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Chris DeGroot
Join Date: Nov 2011
Location: Canada
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Quote:
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July 2, 2012, 08:11 |
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#7 | |
Senior Member
Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 131
Rep Power: 15 |
Quote:
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 |
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July 3, 2012, 14:06 |
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#8 |
Senior Member
Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 131
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My problem is solved and I am now getting the correct pressure drop results. Only problem remains is the Nusselt number !!!!!!!!!
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April 13, 2016, 12:19 |
flow through a channel
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#9 |
New Member
avr
Join Date: Apr 2016
Posts: 1
Rep Power: 0 |
hey goutam
i am doing exactly the same thing. any chance i could hav a look at your fortran code? thx |
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