[NunoM]

Hi,

I am currently trying to simulate the thermal map on a spot light that will be to put in the floor.

I am having doubts when using radiation and how to define in the 3D model the metal halide lamp.
My lamp is 70W. Does any one know how to define this kind of lamps in Solidworks flow simulation? I have the 3D model of it too. I need to know how to define the gases and temperatures and radiations.
About the floor, does any one have done a similiar case? what is the wall defined in this case?

Thank you very much for your help, I did not know this site, just amazing!

Regards,

Nuno | Mechanical Engineer | Portugal

[Boris_M]

Hi Nuno,

Lighting applications with bulbs are pretty similar to each other. It mostly varies due to the different light source types.
In your case since there is no filament but an arc, I would still model it like a solid rod instead of the arc where you can apply the BC. Typically the efficiency of such lamps is 24% and pressures and temperatures inside the arc tube are around 5-50 bar and 1k-3k°C.
I would suggest you try to find some information on more accurate data in the datasheet from the bulb and if there is nothing in there you could try to set a 76% of the 70W as a heat source on the rod with white body walls on that rod and then a radiation source with 24% of the 70W as radiation source on the rod. Try to find at least the pressure of the bulb as that influences the temperature and convection of the bulb partially a lot.
For the ground you should be ok with a fixed outer wall temperature as the ground is a very large capacity for the heat.

For more information on how to setup a project similar to that, have a look at the tutorial with the flood light.

Boris

[NunoM]

Thank you very much Boris. I really appreaciate your help.

I am trying to define the lamp and I will reply to check if I am doing it right. Also, has the first glass (the arc tube) is made of quartz it will absorv some radiation.

I will further send what I have done.

Regards,

Nuno

[NunoM]

Hi again Boris,

I have attach a document in DOCX where I have done some printscreen and ask question. You can check my Lamp 3D model, check if it is ok. The lamp will be fitted in a spot light already designed.

- Should I consider a Spectrum band? If yes, what band?
- Which kind of wall should I define to simulate the floor?

On the arc tube, I have set:
- Set a Volume Source as 70W*0,76%
- Set a Radiation Source – Difuse, 70*0,24% and them select all the faces of arc tube and set as whitebody on the radiation surfaces.

The arc tube is made of quartz, meaning that absorb some radiation. Is it important?

- Which material should I consider to the arc tube as a solidbody?
- Which material should I consider to the outer bulb?

I really appreciate your help. Many thanks in advanced.

Regards,

Nuno