Hello,
  I have an assembly which consists of a resistor placed on a base and held
together with screws (a crude description of the actual setup). My setup is
placed in an oven. If all these materials and geometries are different (I
cannot assume the geometry to be just a horizontal flat plate or vertical
plate etc) how do I calculate the convection coefficient?
  I want to perform a thermal analysis on this setup and convection coeff is a
required parameter.

Thanks in advance.
Lakshminarayan