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LaTeX Math Block
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{\rm Nu}_{ann} = \frac{2 \cdot \epsilon({\rm Ra})}{\ln (r_{ciout}/r_t{in})}


where

LaTeX Math Inline
body--uriencoded--\epsilon(%7B\rm Ra%7D)

Natural Convection Heat Transfer Multiplier

LaTeX Math Inline
body\rm Ra

Rayleigh number 

LaTeX Math Inline
body--uriencoded--r_%7Bout%7D

inner radius of outer pipe

LaTeX Math Inline
body--uriencoded--r_%7Bin%7D

outer radius of inner pipe


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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