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Dimensionless multiplier correcting the conductive Mathematical model of Heat Transfer Coefficient to account for the Natural Thermal Convection effects in the Annulus in the annulus without convection is given as:

LaTeX Math Block
anchorU
alignmentleft
U =  \cdot  \frac{ 2 \, \lambda}{d_{in} \cdot \ln ( \frac{d_{inout}}{/d_{outin}} )}

where

LaTeX Math Inline
body\lambda

_a

thermal conductivity of 
fluid
the annulus media

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

inner pipe 

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

outer pipe 

See also

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Physics / Thermodynamics / Heat Transfer /  Heat Transfer Coefficient (HTC) / Heat Transfer Coefficient (HTC) @model

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