Flat Plate cooling

[SBBlue]

Here's the question;

You have a perfectly smooth, flat plate radiator. Air hits head on, and then obviously flows around the edges.

Given such factors as plate area, temperatures, and air velocity, what is the appropriate equation to describe the heat transfer?

I have partially gone through the Lienhard's excellent book, and could do the calculations if the air was flowing parallel to the plate for either laminar air flow or turbulent air flow. But unless I'm missing it, it doesn't have any thing about air flow normal to a flat plate.

The best I can figure out is that you could treat the flat plate like a large tube, and use the formulas for air flowing normal to a tube. That equation is something like:

Hm = 0.3 * Cp * (air mass flow) ** .4 / Diameter ** .67

(I may not be right on all the numbers, since I don't have the book I took them from in front of me.)

Anybody have any further insights?

 

[magicme]

See chapter 7 of "Fundamentals of Heat and Mass Transfer" by Incropera and Dewitt, which covers inpinging jets.

daveleo