Surface cooling - Rayleigh, Prandtl and Grashof numbers

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Roger44
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Hello,
I am trying to calculate the surface cooling rate from the sides of a round tin can using Rayleigh, Prandtl and Grashof numbers but I'm getting a ridiculously high result, and I'm hoping someone could run through my numbers to tell me where I'm going wrong.

Posting my question is going to take a bit of time, so could you let me know if you're willing to tackle this one.

Thanks
Roger
 
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OK, found it.
I took k of the metal instead of k of air.
Sorry