does the convective heat transfer coefficient of air change at high altitude (due to lower density/pressure) if so how much and how does it translate with forced convection(adsbygoogle = window.adsbygoogle || []).push({});

http://www.engineeringtoolbox.com/convective-heat-transfer-d_430.html says

10.45 - v + 10 * sqrt v = q

but that doesnt work at high speed and thats not even for a different density of air

any equations would be useful

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# Convective heat transfer at altitude

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