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 PPPO May 12, 2013 03:18

local and average Nusselt number

Hi everyone

I have problem to obtain the local and average Nusselt number around square cylinder.
Temperature distribution around the cylinder is achieved.
I'm not sure about dimensionless temperature.
which length should be used as characteristic length
what should i do?

Thanks

 FMDenaro May 12, 2013 06:42

q= - k Grad T -> q L/k(Tr - T0) = - Grad* T*

Nu = |q|L/k(Tr - T0)

and L is the same characteristic lenght used for defining the non-dimensional form of the continuity, momentume and energy equations

 PPPO May 12, 2013 07:36

Quote:
 Originally Posted by FMDenaro (Post 426986) q= - k Grad T -> q L/k(Tr - T0) = - Grad* T* Nu = |q|L/k(Tr - T0) and L is the same characteristic lenght used for defining the non-dimensional form of the continuity, momentume and energy equations
Thanks dear Filippo

but temperature at solid surface of the cylinder is constant.

 FMDenaro May 12, 2013 07:51

Quote:
 Originally Posted by PPPO (Post 426995) Thanks dear Filippo but temperature at solid surface of the cylinder is constant.
but you have to consider the normal derivative of the temperature ...

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