Natural Convection Heat Sink Analytical Model

[EngAP]

I need to learn how to create an analytical model of plate fin natural convection heat sinks to estimate the thermal resistance from component to air.

I have had no luck searching for papers, texts or online guides. I have found several online calculators but I would like to create my own analytical model.

If anyone knows of papers, texts or online guides that may help then I would be grateful for the information.

Thanks.

 

[IRstuff]

???

This sort of model is pretty much in every heat transfer text.

TTFN

FAQ731-376

 

[BPLBPL]

Refer textbook "Introduction to heat transfer" by Frank P.Incopera. Chapter-3: 1D, Steady state conduction

 

[Twoballcane]

Are you asking about from junction temp of chip thru heatsink to air?

Tobalcane
"If you avoid failure, you also avoid success."

 

[Transient1]

Any of the ASME heat transfer journals would have a lot of articles on that kind of stuff.

 

[EngAP]

Thanks for the replies.

IRstuff and bplwithu - I went through several heat transfer texts a while ago and don't remember seeing details about multi-finned heat sinks. I know there are models of natural convection over single vertical plates (as expected) but I am looking for something that brings together all the aspects of a multi-finned heat sink, including air flow effects.

Twoballcane - I need to analytically model the resistance from the back of the heat sink itself to the air.

Transient1 - I will take a look through the journals.

 

[IRstuff]

"Thermal Computations for Electronic Equipment" by Gordon Ellison.

However, I think that you'll find that a purely analytical model is unachievable; there's a reason people created numerical analysis and FEA.

TTFN

FAQ731-376

 

[EngAP]

Thanks IRStuff, however I believe that it is definitely possible to create an analytical model that gives a fair estimation of the result. I have seen several calculators that use analytical models and have seen a method with critical equations missing. I am using computational numerical analysis however an analytical model will provide results a lot faster.

 

[sreid]

Try R-Theta's R-Tools.

http://www.r-theta.com/rtools_front.html

 

[magicme]

this topic is well covered in textbooks...... see...

the textbook Heat and Mass Transfer, Yunus Cengel, Section 9-4 .... deals with exactly this topic, equations and an example.

the textbook Fundamentals of Heat and Mass Transfer, Incroprera and Dewitt, Section 9.7.1 .... equations and examples.

regards,

magicme


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