CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

Efficient thermal conductivity for horizontal layer cooled both from top and bottom

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

LinkBack Thread Tools Search this Thread Display Modes
Old   March 1, 2014, 12:14
Default Efficient thermal conductivity for horizontal layer cooled both from top and bottom
New Member
Nikolay Vinnichenko
Join Date: Nov 2010
Posts: 14
Rep Power: 12
nickvinn is on a distinguished road
I'm trying to simulate cooling of horizontal water layer with heat fluxes specified at top and bottom with a simple engineering model of 1D thermal conduction equation. So, I need an empirical expression for efficient thermal conductivity coefficient. I suppose, it is different for the upper sublayer with unsteady stratification (temperature has maximum at some depth) and for the lower stably-stratified sublayer. I tried using molecular heat conductivity for the lower sublayer and the standard Nusselt-Rayleigh relation for two horizontal plates for the upper one, but the result was unsatisfactory. I guess, this is because there is penetrative convection in the lower sublayer, since the bound between the sublayers is fluid, not a wall. Has anybody encountered relations for efficient thermal conductivity or Nusselt number in such configuration?
nickvinn is offline   Reply With Quote


convection, nusselt

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
Averaged Value Profile From bottom to top in duct Hang Gi Lee CFX 0 February 5, 2007 08:06
errors Fahad Main CFD Forum 0 March 23, 2004 13:20

All times are GMT -4. The time now is 07:21.