Thermal-Solution-Design

Thermal design PPT document
这是我认为最经典的散热设计的文件,不下你会后悔的.
下了别忘留下一点评论或者建议.

thermal-design.pdf

Thermal Solution Design

Prepared by C. P. Cheng

Notebook Thermal Design Challenges
  Seeking for “Desktop” equivalent processor frequency and features.
  Shrinking form factor ( < 35mm is the common design goal).
  35 Watts Northwood in a 17.2 mm internal height.
  24.5 watts Banias in a 13 mm internal height.
  12 watts Banias LV in a 10.2 mm internal height.
  Ergonomics(small,low noise,cool to touch).
  More effective design cycles.
  To achieve long life and more reliable .

How the CPU Heat Dissipation Takes Place
Conduction─Exchange of kinetic energy between molecules.

Radiation   ─Heat is simply radiated away form the object through     
                         electromagnetic waves.

Convection ─Heat transfer is driven by movement of a heated or
                           cooled substance.
Forced Convection
Free Convection
                       
Dimensionless Numbers in Heat Transfer
Reynolds Number = inertia forces / viscous forces
Nusselt Number     = convection / conduction
   High value of this no. means the heat transfer is enhanced by
   convection.
Prandtl Number     =  momentum diffusivity/ thermal diffusivity
   if Pr > 1 means thermal profile develops more rapidly than velocity
   profile. For air Pr=0.72 at moderate temperatures.
Grashof Number    =  buoyancy forces / viscous forces
   In free convection the Grashof number plays the same role as
   the Reynolds number in force convection.
Rayleigh number  =  Grashof number * Prandtl number

     Nu = C *( Ra )**n

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感謝!!

关于风机和热管的, 非常不错. 谢谢

thanks very much.
略看了一下, 终于对"thanks very much"这一句话有了深刻的体会

不知道是关于哪方面的热设计？

下载，看楼主对自己的东西那么有信心，我下得爽，呵呵

这个有翻译的吗？

还没下完，下完了仔细看看！

先下来瞧瞧~

收下了!!