Influence of Enthalpy Changes on the Temperature Dependency of the Viscosity of Pure Liquid Metals

摘要

The temperature dependency of the viscosity of molten pure metals has been thermodynamically discussed as a function of the liquid–state enthalpy. The following equation has been derived:where η and H are the viscosity (mPa·s) and liquid–state enthalpy (J/mol) at a given temperature T (K), η _(0) and H_(0) are the viscosity (mPa·s) and liquid–state enthalpy (J/mol) at the melting point or at any other temperature T_(0) (K), higher than the melting point, C is a proportionality constant with a value of 0.986 (mPa·s), K is the constant coefficient, which is 1/4 (-) for pure metals, and R is the gas constant (J/mol/K). It has been found that the temperature dependency of various pure metals can be predicted using this equation.