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Heat sink design help needed

Heat sink design help needed

Heat sink design help needed

I am designing two heat sinks one with fins and the other with Pin-fins that extrude from a rectangular base.  The base is approx 20"x4"x0.5"  lxwxthick respectively.  The heat sink is A356 cast Aluminum and can be ussumed to have uniform temperature.  I am attempting an analysis on the channels between fin/pin fins for each design.  The pin fins have 2d air flow through the pin-fins while the fins have only 1d natural flow through the fins.  There will be no forced convection just free.  My question is should I perform a free convection analysis on rectangular air channels between fin/pin-fins as internal flow or treat it as external flow.  Goal is to dissapate a given heat loss without increasing the surface temperature of microwave wave-guide the heat sink is fixed to.

Thank you for any help.
Phil Revell

RE: Heat sink design help needed

I think you have to look at the distance between the two fins.  If they are close enough, you'll have to use internal and external characteristics (depending on edge area).  I would base that on the boundary layer formed on each fin.  I'm assuming you are familiar with these types of calculations.  Good luck.

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