External emissivity

  • 16 Views
  • Last Post 30 April 2020
sgvs posted this 28 April 2020

 Hello all, the emissivity value of a certain material I want to specify for my wall is 0.6. Is the external emissivity same. I am trying to model heat transfer to a vehicle with solar model enabled. The wall boundary condition for radiation has this external emissivity field. Kindly help

Order By: Standard | Newest | Votes
abenhadj posted this 28 April 2020

external emissivity is used to provide thermal boundary conditions and it a propriety of the external domain and not of the material of your domain.

Best regards, Amine

sgvs posted this 28 April 2020

Hello Amine, thanks for the reply. How do we calculate that value?

abenhadj posted this 28 April 2020

That is material and surface property of the body outside your domain.

Best regards, Amine

abenhadj posted this 28 April 2020

Use one assuming black body radiation outside.

Best regards, Amine

sgvs posted this 30 April 2020

Hello Amine, I am a bit confused. I want to model solar heat transfer to the body. What will be my external emissivity value at the wall. The default is 1. How do determine the input value for this factor

Close