[Jim Sims]

More data please. If one does things correctly (or incorrectly) one could match the heat transfer rate at the surface of the sun (forced convection boiling heat transfer). What are you trying to do? Make a component that can operate at a certain temperature or make a heat shield to protect other parts? The amount of heat transfered depends on the temperature difference across the sheet. The temperatures on the two sides of the sheet depend on the conditions on the two sides: fluid flow, thermal radiation to and from other colder and hotter surfaces, physical contact, etc. Cheers, Jim