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Heat transfer (disc cooling)

Question asked by Gintautas Nesvarbu on May 1, 2012
Latest reply on May 8, 2012 by David Maxham

Hi,

 

I hope that somebody will help me with my problem. I will try to explain as best as I can including pictures of attempt and description of the problem.

 

I'm trying to simulate brake cooling by using forced convection. The problem is that with my conditions it doesn't show the cooling process. A temperature of 800K stays the same no matter what I try. Air temperature stays the same as well. I know heat transfer coeficient of air passing by, but I don't know where to apply it, as it only lets me to apply for solids (whole part). I know the maximum temperature that brake disc is going to reach.

 

 

 

 

 

A complete desing looks like thatpicture.jpg

 

My attempt to solution (I'm using only the brake disc to find a method as this saves my time) and results needed:

 

Forced convection (cooling) in solids simulation problem:

  • Wall temperature (800K) and fluid temperature (293K) stays the same, even if cold (293K) air flow is passing through.

Results needed and conditions:

  • Temperature change in fluid, depending on solid temperature.
  • Temperature change in solid due to cooling effect of air.
  • No fans.
  • Solid (brake disc) is rotating.

 

1.jpg

Steps taken, setting up in wizard:

 

Heat conduction in solids                                                                                                                                                    

                                                                                                                                                     

                 

2.jpg                    

  Fluid - Air

 

3.jpg                    

 

Solid material – gray cast iron.                                                                                

4.jpg                                  

Initial solid temperature – 800K, Velocity in X direction 30m/s. Temperature 293.2K.

 

5.jpg

Further conditions: 

 

Boundary Condition – Real Wall temperature 800K.

6.jpg

 

Solid material – Grey cast iron.

 

7.jpg


Flow simulation type: External

 

 

THANK YOU all in advance.

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