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

Molar or mass averaged velocity in Darcy's law

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 22, 2020, 05:57
Default Molar or mass averaged velocity in Darcy's law
  #1
New Member
 
Daniel
Join Date: Jun 2019
Posts: 4
Rep Power: 7
Dan96 is on a distinguished road
Hello there,


can anyone help me to figure out, which type of velocity is used in Darcys Law.


In literature some authors understand the Darcy-Velocity as a molar averaged velocity and some understand it as a mass averaged velocity. (The most of them use the mass averaged velocity but I wanna use the molar averaged velocity if possible because there are some advantages in my system.)



In the original fomulation of Henry Darcy there shouldn't be a difference between both velocities because he observed a one-component system (flow of pure water). In a multicomponent system there could theoretically be a discrepancy because molar and mass averaged velocities are no longer the same.



So based on the orignal Darcys law it should be possible to calculate either the molar or the mass averaged velocity from the pressure gradient. Is this thesis correct or does the derivation of Darcys law from Navier-Stokes Equations come to another result?


Best regards


Daniel
Dan96 is offline   Reply With Quote

Reply

Tags
average velocity, darcy, darcy's law, navier stokes

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
Wrong flow in ratating domain problem Sanyo CFX 17 August 15, 2015 06:20
Time averaged velocity in turbulent pipe flow tsero FLUENT 1 November 2, 2012 03:19
how to plot out circumferentially mass averaged axial velocity in a rotor? wildli FLUENT 0 July 17, 2010 15:54
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11
Darcy's Law flow into and out of a box Paul Missel Main CFD Forum 6 July 20, 2001 05:26


All times are GMT -4. The time now is 07:51.