Surface cooling - Rayleigh, Prandtl and Grashof numbers

AI Thread Summary
The discussion revolves around calculating the surface cooling rate of a round tin can using Rayleigh, Prandtl, and Grashof numbers. The initial calculations yielded unexpectedly high results, prompting a request for assistance in identifying errors. The issue was later resolved when it was discovered that the thermal conductivity (k) of the metal was mistakenly used instead of that of air, which corrected the calculations.
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
 

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