Heat transfer between I beam and environment
Heat transfer between I beam and environment
(OP)
Hi, I've got a question about heat transfer. I'm doing thermal-structural analysis in Patran and I'm not sure what boundary conditions I should use in thermal analysis.
I want to analyze displacements in I beam in different ambient temperature. Should I define convection or radiation in this situation (or maybe both)? And if both types of heat transfer occurs is it too big simplification to assume that radiation would not be analyzed. I would prefer not to use radiation becouse I've got a problem with defining proper view factors.
I want to analyze displacements in I beam in different ambient temperature. Should I define convection or radiation in this situation (or maybe both)? And if both types of heat transfer occurs is it too big simplification to assume that radiation would not be analyzed. I would prefer not to use radiation becouse I've got a problem with defining proper view factors.





RE: Heat transfer between I beam and environment
Otherwise I usually take 10 W/sqm/degC over the whole exposed surface (in still air, the double in windy environment): this value includes the radiation contribution (about 50% of the total).
prex
http://www.xcalcs.com : Online engineering calculations
http://www.megamag.it : Magnetic brakes and launchers for fun rides
http://www.levitans.com : Air bearing pads
RE: Heat transfer between I beam and environment
RE: Heat transfer between I beam and environment
One can have radiation with little convection and conduction and of course the other permutations and combinations.
With the heat source are you interested in steady and/or transient conditions? For the beam are you interested in thermal induced deflections and/or stresses? If the temperatures are high enough then you can get into the material property dependency and even perhaps the load dependency issues.
If this is an I beam in a open building with varying ambients then as suggested you can probably just assume the beam is at the ambient. On the other hand if the beam is supporting a piece of high precision equipment in a high temperature radiation chamber then a more sophisticated approach might be warranted.
Have Fun!
James A. Pike
www.xl4sim.com
www.erieztechnologies.com
RE: Heat transfer between I beam and environment
RE: Heat transfer between I beam and environment
RE: Heat transfer between I beam and environment
RE: Heat transfer between I beam and environment
RE: Heat transfer between I beam and environment
RE: Heat transfer between I beam and environment
RE: Heat transfer between I beam and environment