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

Plug Flow

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 3, 2003, 11:40
Default Plug Flow
  #1
Franck
Guest
 
Posts: n/a
Hi!

I am just looking for some explanations about "plug flow". Anyone who could help me?

BR

Franck
  Reply With Quote

Old   September 3, 2003, 11:54
Default Re: Plug Flow
  #2
prasat
Guest
 
Posts: n/a
what do you want to know I can help
  Reply With Quote

Old   September 3, 2003, 11:58
Default Re: Plug Flow
  #3
Franck
Guest
 
Posts: n/a
What is a Plug Flow? Equations? Where does a Plug Flow appear? Thanks for helping!
  Reply With Quote

Old   September 4, 2003, 06:57
Default Re: Plug Flow
  #4
Helge
Guest
 
Posts: n/a
I recommend a book for two phase flow on this item. But to make it short.

Plug flow is a two phase flow pattern(liquid and gas) in a pipe. Large bubbles with arbitrary shape occur.

Assuming a liquid/gas cocurrent flow in a horizontal pipe with constant liquid flow rate you will observe the following when increasing the gas mass flow:

very low flow rates: small bubbles are transported by the liquid. The bubble shape is spherical.

low flow rates: stratified flow with a smooth or wavy interface between liquid and gas can be observed.

increasing flow rates: the wave amplitude increases until the waves reach the top wall of the pipe. Now you have plug flow. The bubbles are concentrated along the top side of the pipe and have arbitrary shape.

even larger flow rates: The bubbles connect to each other until you have a gaseous core and the liquid flows along the pipe wall. The gas entrains liquid droplets into the gas core.

You observe plug flow in inclined or vertical pipes too.

To determine what kind of flow you have in a pipe, a lot of flow pattern maps exist, where the flow pattern is marked according to dimensionless mass flow rates of liquid and gas.
  Reply With Quote

Reply

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
Flow meter Design CD adapco Group Marketing Siemens 3 June 21, 2011 09:33
Mass flow and U-Mom flow in CFX Zhihua Xie CFX 0 September 3, 2007 10:49
reversed flow at velocity inlet / mass flow inlet ib FLUENT 1 March 26, 2007 14:11
How to change from mass flow to volume flow rate stanley FLUENT 1 February 2, 2007 07:44
transform navier-stokes eq. to euler-eq. pxyz Main CFD Forum 37 July 7, 2006 09:42


All times are GMT -4. The time now is 05:05.