# Solidworks Flow Simulation 2011: Thermal Modeling of light sources

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 April 5, 2012, 11:56 Solidworks Flow Simulation 2011: Thermal Modeling of light sources #1 New Member   Eric Szumiesz Join Date: Apr 2012 Posts: 2 Rep Power: 0 Hello, I am a Mechanical engineer and a trying to use solidworks to model the thermal output and effects of light sources. Things that need to be considered: 1. Radiation from the light source 2. Spectral output of light source 3. Effects on objects and environment temperature. 4. Light source in a reflector to create a collimated beam. (point the light in a desired direction) I have been attempting this for some time now however I am not satisfied with my results. Rather than showing what I have done I was wondering if anyone else has tried to do this also. Maybe give me some steps to how you were able to achieve this task. Any help would be greatly appreciated. Thank you.

 May 17, 2012, 16:51 #3 New Member   Eric Szumiesz Join Date: Apr 2012 Posts: 2 Rep Power: 0 Boris, Thank you for the reply. I have modeled using your suggestions and feel I am getting good results. Question about using the diffusive radiation source. I model the filament and apply the spectrum to the surface like you had suggested. Then I am prompted to enter the power for this. For example I modeled a 300[W] light source that only transmitted 36.75[W] of flux. What value should I be putting in this field? I am also modeling a reflector using symmetry as a radiation surface, seems to work well. Is that correct? Thanks again, Eric

 May 22, 2012, 10:23 #4 Senior Member   Boris Marovic Join Date: Jul 2009 Posts: 504 Rep Power: 16 Hi Eric, Are you sure it only has 36,75W flux? That would be just 8% radiation? I would rather use the constant temperature on the filament accoring to it's surface temperature which is usually pretty close to the light temperature for most incandescent bulbs and then use a equation definition for the radiation power with 300W-(heat transfer rate goal on filament surface)=(radiated power over spectrum that is defined) This should give the most accurate results. For the reflector I would use a user defined radiation source where you can define what percentage is specular or diffusive reflection and define the absorbtion on this surface. With the symmetry surface everything is specular and there is no absorption at all which is not quite as in reality. Boris

 December 22, 2016, 09:48 #5 New Member   Ethan Kellough Join Date: Dec 2016 Posts: 1 Rep Power: 0 Hi Boris, I have found your advice on this thread very helpful. However, I am trying to model a fluorescent lamp undergoing forced convection. For me, the constant surface temperature condition does not work as you described it because the lamp should become cooler as flow increases (that is the point of the forced convection). Do you have any pointers for modelling fluorescent lamps? Thanks! Ethan

 Tags light, optics, radiation, simulation, solidworks

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