Sharp Interface Formulation
Phase field
•  Sharp interface limit:
•  McFadden & Wheeler (1996)
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•                     is a natural extension of the Cahn-Hoffman          of sharp interface theory
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•  Cahn & Hoffman      (1972, 1974)
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•       is normal to the         -plot:
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•  Isothermal equilibrium shape given by
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•  Corners form when         -plot is concave;