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Originally Posted by NHRA 303
WOW. Thank you so much for the great reply's. That makes so much sense. Even in my original question "Thermodynamics". I guess i was looking for a fluid dynamic answer, to a thermodynamic question.
After reading the "Burns article". It just made sense. This pretty much says it all:
Typical 1010 carbon (mild) steel conducts 219% more heat per foot than do the types of stainless steel we use in header fabrication. By contrast, quite a bit more heat stays inside the stainless header tubes and does not get passed into the surrounding air. By not allowing the contraction of the cooling gases as they flow down the tubes, more exhaust velocity is retained which promotes better scavenging at the collector. This retention of velocity increases the overall header efficiency.
Thanks again everyone. I luv reading all of your posts to every subject.
Steve Tucholsky
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Steve,
You were actually looking for a Gas Dynamics response which happens to be related to Fluid Dynamics.
Here is a link to a good treatise regarding Gas Dynamics.
http://www3.nd.edu/~powers/ame.30332/notes.pdf