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thermal convection and conduction

thread727-26737

thermal convection and conduction

thermal convection and conduction

(OP)
my task is create a temperature profile of a clylindrical glass lens that is heated thru convection along its circumfernce.  it loses heat via convection and radiation on its planar surfaces.  
i would like to know if i have to model the air that surrounds the lens.  if i simply apply a convection load to the surface, how does ansys know that the lens is surrounded with air?  does it matter?  thanks!!
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