Compare to the equation in the Heat Transfer Module User’s Guide

heat theory section about Surface-to-Ambient Radiation.

See Also

D O M A I N S E L E C T I O N

Select the domains where you want to add an out-of-plane surface-to-ambient heat transfer contribution.

U P S I D E P A R A M E T E R S

The default Surface emissivity eu, a unitless number between 0 and 1, is taken From material. Select User defined to enter another value. An emissivity of 0 means that the surface emits no radiation at all while a emissivity of 1 means that it is a perfect blackbody.

Enter an Ambient temperature Tamb,u (SI unit: K). The default is 293.15 K.

D O W N S I D E P A R A M E T E R S

Follow the instructions for the Upside Parameters for the downside parameters ed and

Tamb,d.

Out-of-Plane Heat Flux

Select the Out-of-plane heat transfer check box on the Heat Transfer

1D

interface to add this feature to 1D and 2D models.

2D

The Out-of-Plane Heat Flux feature adds a heat flux q0,u as an upside heat flux and a heat flux q0,d as a downward heat flux to the right hand side of Equation 13-7 or Equation 13-8:

dsq0 u + dsq0 d

432 | C H A P T E R 1 3 : H E A T T R A N S F E R B R A N C H