Posted by Deutz Lover on November 25, 2016 at 10:59:38 from (174.218.9.166):
In Reply to: black body radiation posted by Geo-TH,In on November 24, 2016 at 06:28:02:
There is a lot of misunderstanding about black-body radiation.
This is really only effective at much higher temperatures than a tractor engine gets. Black bodies are more effective a heat absorbers than transmitters at normal temperatures. For instance a black painted car will get hotter than a white painted car. Convection fins are a lot better at removing heat than a black body for this purpose. Color does not matter as much on these as surface finish.
A very smooth polished surface is not as good at convection cooling as a rougher surface because air flowing over the fins does not contact the metal because of laminar air flow across polished surfaces. This is the reason intake manifolds are not supposed to be polished compared to the exhaust ports and manifolds on carbureted engines. In this case the purpose is to create turbulence to mix the fuel/air. The fins on air cooled motors should not be smoothly polished so that the heat can be transferred to fresh air at the metal/air interface which is not as efficient when the surface is smoothly polished.
A thin paint (.001") really does not impair heat flow that much.
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