溶融NaOHの表面張力およびマランゴニ対流挙動

概要

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We measured the surface tension of molten NaOH by means of the maximum bubble pressure method, and investigated the thermal Marangoni convection behavior in a small liquid bridge of molten NaOH confined between two platinum disks. The measured temperature coefficient of surface tension (=∂σ/∂T) is positive at lower temperature range (T<721K) and negative at higher temperature range (T>721K). But these values are much smaller than those reported previously by T. Nakamura et. al.. Numerical simulations were conducted to reproduce the visualized flow pattern in a small molten NaOH bridge using the measured surface tension. The numerical results were in good agreement with the experimental ones under various thermal conditions, and revealed that the different multi-roll cell flow patterns are formed depending upon the heating conditions of platinum disks.
九州大学の論文
1996-11-12