OHTC of inside film and pipe wall

Overall heat transfer coefficient (OHTC) of the inside film and pipe wall.

Symbol

$U_{inwall}$

Unit

W/(K.m$^2$)

Formulae

$\frac{1}{\frac{D_{ref}}{D_{in} h_{in}}+\frac{D_{ref}}{D_{wall} U_{wall}}}$

Related

$D_{in}$

Inner diameter of pipe [m]

$D_{ref}$

Reference diameter for determination of OHTC [m]

$D_{wall}$

Outer diameter of steel pipe [m]

$h_{in}$

Heat transfer coefficient inside [W/(K.m$^2$)]

$U_{wall}$

OHTC of pipe wall [W/(K.m$^2$)]

Used in

$\mathrm{Bi}_p$

Biot number of the pipe