On Wed, Dec 5, 2012 at 2:07 PM, Jed Rothwell <[email protected]> wrote:
People often use powder these days, which has a surface area slightly > astronomical. I have no idea how you would compute that! Perhaps some > method similar to dropping a little oil on water to estimate Avogodro's > constant. > For the purpose of comparison, you might be able to use some kind of boundary for flux, rather than work with the actual surface area of the active material. For example, for a sphere of radius 10 cm around the device, such-and-such average power has been measured to evolve during XP. Then the shrink the sphere down so that it just contains the active region, and use the surface area of the sphere for the calculation. Change the shape to be a rectangular prism if that would provide a better fit. Eric
