THERMAL CONVECTION DURING HORIZONTAL SOLIDIFICATION OF PURE METALS AND ALLOYS.
TORONTO UNIV (ONTARIO)
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Temperature fluctuations have been observed by sensitive thermocouples placed in intimate contact with the liquid during the horizontal and unidirectional solidification of pure metals and alloys. These fluctuations are caused by the presence of thermal convection in the liquid as the result of a temperature gradient. The amount of thermal convection is shown to be a function of the temperature gradient in the liquid, the rate of solidification, the height of the solidliquid interface, the angle of deviation of the interface from the vertical plane, and the fluid parameters of the liquid metal. The presence of thermal convection during the horizontal growth of alloy crystals may affect the steady-state solute distribution in the liquid to cause macroscopic segregation. Author