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Title: Studies on solidification of metals with two dimensional heat flow
Author: Krishnamurthy, Kannurpatti Venkatadry
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1969
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Theoretical and practical investigations have been carried out on the problem of solidification with two-dimensional heat flow in the edge region of a billet. In the practical investigation, solidification of lead at zero-superheat has been studied by a thermal analysis method using automated data processing. The experimental solidification unit consisted of a simulated square billet edge, heat being extracted from the two sides by forced convection to a specially designed multi-air jet system. Different designs of this jet system allow the heat transfer coefficient to be distributed uniformly over the cooled surface, or in a predetermined manner. The magnitude and distribution of the heat transfer coefficients between the base of the solidification unit and the air jet system were determined by a mass transfer analogue method, involving the evaporation of naphthalene. mean values of the heat transfer coefficients were also determined in a series of steady state heat transfer experiments. The solidification experiments have been performed using different mean values of the heat transfer coefficient. The effect of a step change in the heat transfer coefficient on the progress of solidification in the billet edge has also been investigated. In the theoretical part of the investigation, Hills' integral profile solutions for uni-directional solidification of metals has been extended to include the effect of the edge by treating this two dimensional problem as a pseudo one dimensional problem. Experimentally measured positions of the solidification front have been shown to agree with the predictions of this theory when the heat transfer coefficient is uniformly distributed over the cooled surfaces.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available