# UDF at the wick/vapor interface

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

January 13, 2012, 02:40
UDF at the wick/vapor interface
#1
New Member

A.Brusly Solomon
Join Date: Mar 2009
Posts: 2
Rep Power: 0
hello

I am trying to solve a heat trasfer problem. In that,I wanted to apply the boundary condition at the wick/vapor interface(considerd as flat boundry) as given in the attachment in eqn (5).can anybody help me in this regard?

Attached Files
 unni.doc (66.0 KB, 22 views)

January 21, 2012, 08:22
#2
Senior Member

Join Date: Jun 2011
Posts: 125
Rep Power: 7
Quote:
 Originally Posted by brusly hello I am trying to solve a heat trasfer problem. In that,I wanted to apply the boundary condition at the wick/vapor interface(considerd as flat boundry) as given in the attachment in eqn (5).can anybody help me in this regard? Thanks in advance
Equation 5 appears to be wrong. The only transport process occurring at the interface will be:

Heat transfer from the air to the wick + enthalpy of vaporization = change in enthalpy of the wick

see the similar post here:

http://cape-forum.com/index.php/topic,7.0.html

That case, the wick is assumed to be spherical.

January 21, 2012, 10:51
#3
Senior Member

Real Name :)
Join Date: Jan 2010
Location: United States
Posts: 193
Rep Power: 8
Mali28,

How does equation 5 differ from the heat transfer process you've described in your equation?

ComputerGuy

FYI: This problem has been tackled (assume this question is a copy/paste out of the article). Have a look at "Transport in Flat Heat Pipes at High Heat Fluxes From Multiple Discrete Sources" by Vadakkan, Garimella, and Murthy. Journal of Heat Transfer, June 2004, Vol 126.

Quote:
 Originally Posted by mali28 Equation 5 appears to be wrong. The only transport process occurring at the interface will be: Heat transfer from the air to the wick + enthalpy of vaporization = change in enthalpy of the wick see the similar post here: http://cape-forum.com/index.php/topic,7.0.html That case, the wick is assumed to be spherical.

January 21, 2012, 12:07
#4
Senior Member

Join Date: Jun 2011
Posts: 125
Rep Power: 7
Quote:
 Originally Posted by ComputerGuy Mali28, How does equation 5 differ from the heat transfer process you've described in your equation? ComputerGuy FYI: This problem has been tackled (assume this question is a copy/paste out of the article). Have a look at "Transport in Flat Heat Pipes at High Heat Fluxes From Multiple Discrete Sources" by Vadakkan, Garimella, and Murthy. Journal of Heat Transfer, June 2004, Vol 126.

The first term in the equation is heat transfer by conduction. There is no conduction, the only heat transfer process from air to the wick is via convection process.

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post shankara.2 Fluent UDF and Scheme Programming 1 January 16, 2012 23:14 kim FLUENT 3 October 26, 2011 21:38 Qureshi FLUENT 1 December 2, 2009 01:27 Luc SEMINEL FLUENT 0 November 25, 2002 05:03 Luc SEMINEL Main CFD Forum 0 November 25, 2002 05:01

All times are GMT -4. The time now is 06:48.