# How to set slip velocity and temperature jump

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

 April 24, 2012, 23:40 How to set slip velocity and temperature jump #1 New Member   awu Join Date: Mar 2012 Posts: 4 Rep Power: 5 Hey friends: I am dealing with microchannel heat transfer in CFX，but i dont know how to set up slip velocity and temperature jump boundary condition . I choose finite slip wall，but i dont know how to set slip modal and wall velocity.I am new to CFX. Thanks for any possible help.

 April 25, 2012, 07:48 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,800 Rep Power: 85 In CFX you can only have no slip walls or specified shear stress. There is no finite slip built in. You will have to derive it yourself and impose it as an expression (hopefully as CEL) on either a no slip wall (with wall motion presumably) or a shear stress wall.

April 25, 2012, 21:19
slip velocity
#3
New Member

awu
Join Date: Mar 2012
Posts: 4
Rep Power: 5
Quote:
 Originally Posted by ghorrocks In CFX you can only have no slip walls or specified shear stress. There is no finite slip built in. You will have to derive it yourself and impose it as an expression (hopefully as CEL) on either a no slip wall (with wall motion presumably) or a shear stress wall.
Dear ghorrocks:

Thank you for your help. But I still don't fully understand. How can i use CEL to simulate velocity slip?What should i edit in CEL？That would be the best for you give me a example.
Best regard

awuunity
Like

 April 26, 2012, 06:04 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,800 Rep Power: 85 You have to know the mathematics of what you want to implement before you can implement anything. What is the mathematics of what you want to apply?

April 26, 2012, 08:05
#5
New Member

awu
Join Date: Mar 2012
Posts: 4
Rep Power: 5
Quote:
 Originally Posted by ghorrocks You have to know the mathematics of what you want to implement before you can implement anything. What is the mathematics of what you want to apply?
Dear ghorrocks:

Thank you for your help.I want to simulate water flows through tube and the tube's diameter is 0.01mm, length is 2mm. tube's outer surface temperature is 333.15K.The velocity of inlet set to 0.1m/s,temperature set to 293.15K.Set outlet static pressure to 0Pa.

Best regard

awuunity

 April 26, 2012, 18:39 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,800 Rep Power: 85 This is all routine stuff, the normal boundaries can handle this. Your first post mentioned a finite slip wall - do you really need this?

April 27, 2012, 22:06
3Q
#7
New Member

awu
Join Date: Mar 2012
Posts: 4
Rep Power: 5
Quote:
 Originally Posted by ghorrocks This is all routine stuff, the normal boundaries can handle this. Your first post mentioned a finite slip wall - do you really need this?
Dear ghorrocks:

I learned the help documentation of cfx，I think that maybe i should choose to finite slip wall，but i dont know how to set slip speed according to my model.
Best regard

awuunity

 April 29, 2012, 06:50 #8 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,800 Rep Power: 85 Do you even know what a finite slip wall is?

 Tags slip velocity

 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 Attesz CFX 7 January 5, 2013 04:32 yassepid OpenFOAM 1 June 10, 2012 23:46 dayashankar FLUENT 0 February 6, 2012 06:00 R P CFX 2 October 26, 2004 02:13 chong chee nan FLUENT 0 December 29, 2001 06:13

All times are GMT -4. The time now is 04:07.