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 June 12, 2013, 05:21 #2 Senior Member   Rami Ben-Zvi Join Date: Mar 2009 Posts: 148 Rep Power: 10 Although your query is specific to Fluent (and better be posted in the Fluent forum), the Eq. (31.4-21) you cite is the explanation: The intensity I integrated over the whole solid angle w results in W/m^2 as the units of the incident radiation, G.

 June 12, 2013, 09:46 #3 New Member   Join Date: Apr 2013 Posts: 8 Rep Power: 6 Thanks for your reply. I will try to move this discussion over to the appropriate forum as soon as I figure that out. Thanks. Back to the query. I am unsure of what Fluent considers intensity, I as. From my understanding of intensity; it is defined as power per steradian (solid angle) and doesn't change with distance from source/antenna. Therefore, it should have units of (W/sr) and after integrating with a range of solid angles, should result in simply (W). I am aware however, there is fragmentation in definitions of intensity in the world of "optics" so I looked up Wikipedia to gain a better understanding. http://en.wikipedia.org/wiki/Radiation_intensity http://en.wikipedia.org/wiki/Power_density http://en.wikipedia.org/wiki/Solid_angle According to Wikipedia, radiation intensity is the power density per solid angle. This confuses me even more because if so, the units will be (W/m^3) * (m^2) = (W/m??) I know I am not an expert in this topic so please be patient with me Thanks for any help and feedback.

 June 16, 2013, 04:51 #4 Senior Member   Rami Ben-Zvi Join Date: Mar 2009 Posts: 148 Rep Power: 10 The intensity, I, is defined (see e.g., Modest or Siegel and Howell or Sparrow books) as the power per area normal to rays per steradian, and its units are therefore W / (m^2 * sr).

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