Hi, i need help regarding simulating a bulb or a flourescent light radiation in a space or room using flow simulation, does anyone know how could this be done correctly? i just got to make sure that what im really doing is right, thanks to anyone who can help me..
Hi,
Never done such analysis, but could you provide what you've done so far ? so we can check if this is seems good or if there are changes to make.
Hi thanks for the response, actually I just need to know what is the more suitable to use when dealing with LED bulbs, incandescent bulb and flourescent bulb, I just want to know if Heat sources or Radiation sources is the one to use, because i am not sure if I will use Radiation source or Heat source for Bulbs, thanks..
So, between those two, I would choose Radiation Sources, considering you want to know the radiation effects on a surface ?
Maybe before going to the real problem, you could do a test (with a very simple geometry, like two parallel planes) to know what's the difference-s (if there is/are) in terms of radiation flux on the surface you want, if you have a Heat Source, or a Radiation Source, both will produce radiations - I don't know actually what will be the differences in terms of radiation, cause it's probably depending on how Flow treats the sources...
Hope it helps a bit.
Hi, probably you are right, maybe I should go to Radiation sources since i am after the radiation effects on surfaces not the heat, cause what I am really aftee is the effects of a UV-C led lights, its a small disinfection box with small UV-C led lights, so i dont think it would produce that much of heat, its like a 2x2mm led light size only, so I think i rather go to Radiation Sources, thanks man.
Conjugate heat transfer is any combo of conduction, convection and radiation. Convection is on by default. Conduction you turn as you do with radiation. If you don't want convection but you want the other two you need to remove the fluid (vacuum). If you want radiative heat transfer you turn it on.
I would imagine you are after the dose on a surface so you can't do that without radiation. Flow sim will not give you dose but you can get the flux and then calc the time required to get the dose.
Hi Bill thanks for the response, actually i am planning on calculating the radiation flux on a small UVC disinfection box nowadays, and also I am planning on analyzing the flux of radiation of UVC to the surface using a small wand UVC, I mean the LED light are very small something like 1x1mm or 2x2mm I think, and for the heat issue I dont think I will mostly consider that in my case since the UVC leds are very small and does not heat that much, I am really after on the irradiance flux on the surfaces being disinfected. I just want to know if I am going in the right direction, and by the way thanks again Bill.
Hi Bill, I have this question, I am just confused how I am getting radiant flux in the back of a solid part in which UVC light is on the opposite side, I mean I believe light cannot pass on a solid part, I will show you some photos so you can understand what I am saying, that is a Wand UVC disinfection LED lights, the LED's are inside the solid part, and it is disinfecting a smart phone, I just dont get it why I am having a reading of Flux in the backside of the solid (on picture #3), I dont believe light can pass or bounce at the backside of the Wand UVC since the LED's are inside the solid, I dont know if this is a heat or something, what I am really trying to get is the irradiance flux of UVC light on the surfaces of the smart phone so that I can compute for the Dose needed based on the Flux reading, I just dont get it why light can still bounce at the backside of the UVC Wand. Thank you Bill, any ideas is a big help to me.
Well, if the thing is getting warm and the surface is a radiating surface it will emit or absorb. If the LED's are getting warm then they conduct through the material (assuming its conducting) and when the energy hits the back side surface it radiates to ambient. You can select the surface and make it non radiating. You can make the wand an insulator and it won't participate. The positive numbers are emitting and the negative numbers are absorbing by the looks of it. Hope that helps.
Hi Bill thanks for the response that was a big help, at least now I understand why it happened that way.
Actually I just want to know how far the light from UVC wand can travel, so that I will know if it is hitting the hands when you are holding it while disinfecting. Thanks.
So, between those two, I would choose Radiation Sources, considering you want to know the radiation effects on a surface ?
Maybe before going to the real problem, you could do a test (with a very simple geometry, like two parallel planes) to know what's the difference-s (if there is/are) in terms of radiation flux on the surface you want, if you have a Heat Source, or a Radiation Source, both will produce radiations - I don't know actually what will be the differences in terms of radiation, cause it's probably depending on how Flow treats the sources...
Hope it helps a bit.