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Unformatted text preview: vaporization temperature, energy is absorbed by the metal as it changes from solid to vapor. There are a number of mathematical questions associated with this problem. The one we address is to determine how rapidly the hole is formed for a given value of the power per unit area of irradiating beam. This is a heat conduction problem with a phase change (solid to gas), and a moving boundary. There are several calculations to be done. One involves calculating the time for the boundary x = 0 to heat to the vaporization temperature. Another calculation justifies that it is reasonable to neglect heat flow in the x and y directions....
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 Fall '08
 Bell
 Math

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