[miyage218]

hi everybody, I want to ask a problem about radiation. I will compute a problem which includes radiation heat transfer effect. but I want to calculate view factor, sometimes calculetes correctly sometimes wrong. have you any experience about this? how can I calculate true value of view factor everytime? which factors do depends view factor? I am waiting your replies.

[macfly]

Hi,

Maybe you need to read some heat transfer book in order to understand the s2s model and the view factors. It's 100 times more efficient than asking on the forum. e.g. http://ca.wiley.com/WileyCDA/WileyTi...ilter=TEXTBOOK

[donQi]

See also :
chapter 13.3.7 of Fluent 6.3 Radiation Model Theory pag 995 (http://aerojet.engr.ucdavis.edu/flue...f-download.htm)
The surface-to-surface radiation model can be used to account for the radiation exchange
in an enclosure of gray-diffuse surfaces. The energy exchange between two surfaces de-
pends in part on their size, separation distance, and orientation. These parameters are
accounted for by a geometric function called a “view factor”.
[from Fundamentals of Heat and Mass Transfer Incropera chapter 13.1 pag812]
The view factor F_ij is defined as the function of the radiation leaving surface "i" that is intercepted by surface "j".

[lieyna]

Hi dear,

I tried to open the link but it cannot work. Could you please give the title of the book?

Thanks in advanced

Originally Posted by macfly

Hi,

Maybe you need to read some heat transfer book in order to understand the s2s model and the view factors. It's 100 times more efficient than asking on the forum. e.g. http://ca.wiley.com/WileyCDA/WileyTi...ilter=TEXTBOOK