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

Gas velocity

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 4, 2003, 05:23
Default Gas velocity
  #1
Newbie
Guest
 
Posts: n/a
I need to calculate a system where a gas is injected into a large space through a pipe. The gas pressure is higher than the ambient, what happens when the gas leaves the pipe, I would assume that the gas pressure is decreased to the ambient pressure and the density decrease and velocity increase. Is that correct and what is the correct way of modelling such a system.

I do not want to model the pipe system but just include the outlet of the pipe, but which velocity should then be used?

The velocity based on the density calculated from the real gas pressure or the velocity based on that the gas pressure is equal to the ambient pressure.

What happens if it is an incompressible fluid, i.e. water

Thanks in advance Newbie
  Reply With Quote

Old   April 7, 2003, 06:55
Default Re: Gas velocity
  #2
Christian
Guest
 
Posts: n/a
Q:Is that correct

A: Yes

Q:what is the correct way of modelling such a system

A:That depends on what you are looking for.

Q:but which velocity should then be used

A:That depends on diameter and pressure.

Q:The velocity based on the density calculated from the real gas pressure or the velocity based on that the gas pressure is equal to the ambient pressure

A: If you are looking for tha velocity of the fluid, you need to know the pressure difference between the gas pressure and the amb. pressure.

Q:What happens if it is an incompressible fluid, i.e. water

A: Happens to what ?

Try explaining your problem with more details, ie. what you are looking for ect.
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Problem with assigned inlet velocity profile as a boundary condition Ozgur_ FLUENT 5 August 25, 2015 05:58
variable gas density - constant velocity mauz Main CFD Forum 0 March 15, 2010 10:38
how to simulate velocity field of supersonic gas (400m/s) from a nozzle to a chamber CYMa OpenFOAM 3 December 15, 2009 22:31
Inlet Velocity in CFX aeroman CFX 12 August 6, 2009 19:42
Gas plume or flare simulation ahourri FLUENT 0 November 14, 2005 10:23


All times are GMT -4. The time now is 20:40.