Abstract
The viscosity-density relation, (η/ρ)⅓=a+b/T due to Mitra is applicable to normal liquids over wide ranges of temperature, and obtainable accuracy is comparable to that of Andrade's well-known equation connecting the quantities. Liquid metals, however, show anomalous viscosity on approaching the freezing point. Deviation from Andrade's equation in such liquids has been explained by McLaughlin and Ubbelohde as due to the formation of clusters on the approach of the freezing point. It is shown here that a similar analysis is possible starting from Mitra's relation as well. Deviations from Mitra's relation and the prefreezing phenomenon in the viscosity of molten aluminum are examined in terms of the McLaughlin—Ubbelohde theory. Starting from the Mitra relation, cluster parameters for aluminum are evaluated for the first time.
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