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In case of natural convection in the annulus the Nusselt number becomes also dependant on the annulus geometry:


LaTeX Math Block
anchor1
alignmentleft
{\rm Nu} = \frac{2 \cdot \epsilon
_{app}}{\ln
(
r_
{
ci}/r_t)} LaTeX Math Block
anchor1
alignmentleft
{
\rm 
Nu} = \frac{2 \cdot \epsilon
Ra})}{\ln (r_{ci}/r_t)}


where

LaTeX Math Inline
body

--uriencoded--

\epsilon

_%7Bann%7D

Natural Convection Heat Transfer Multiplier

LaTeX Math Inline
body\rm Ra

Rayleigh number 


Forced Convection

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In Forced Fluid Convection the 
Nusselt number becomes dependant on Reynolds number 

LaTeX Math Inline
body\rm Re
 and Prandtl number 
LaTeX Math Inline
body\rm Pr
LaTeX Math Inline
body--uriencoded--\mbox%7BNu%7D = f (\mbox%7BRe%7D, \mbox%7BPr%7D)
.

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