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The ratio of convective to conductive heat transfer across (normal to) the boundary:


LaTeX Math Block
{\rm Nu} = \frac{\rm Convective \ heat  \ transfer}{\rm Conductive \ heat \ 
 transfer} = \frac{U}{\lambda / L} =\frac{U \cdot L}{\lambda }



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where 

LaTeX Math Inline
bodyU
 is the convective heat transfer coefficient of the flow, 
LaTeX Math Inline
bodyL
 is the characteristic length, 
LaTeX Math Inline
body\lambda
 is the thermal conductivity of the fluid.



See also

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Physics / Thermodynamics / Heat Transfer

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