Quote:
Originally Posted by Reaper
yes they contract as they cool but the exhaust pulse slows down further down the exhaust stream and slows which has a greater effect. That's why I wrote "effectively" I was trying to make it easier to understand.
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I understood the use of 'effectively', just that the use of 'expands' is completely wrong. I don't think or mean to imply that your
understanding of this aspect of fluid dynamics is lacking. And disclaimer: I am no expert myself. I only think it was your
explanation that was incorrect.
As the decrease in exhaust gas velocity is, at least in part, due to its contraction, using the term "expands" in the explanation is counter-intuitive when introducing these concepts to someone unfamiliar.