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Title: Heat transfer in metals solidifying with linear heat flow
Author: Moore, Michael Richard
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1967
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The solidification of lead and tin has been studied under conditions of one dimensional heat flow with heat removed by convection with a constant heat transfer coefficient, Values of the heat transfer coefficient in the range 20-40 (Btu/ft2hr°F) have been used. These values were independently measured using steady state heat transfer and mass transfer analogue techniques, which gave results in fair (+ 10%) agreement. The position of the solidification front was independently measured using thermal analysis and dip stick techniques, which gave results in good agreement. At zero superheat the solidification of both lead and tin was studied. The effects of different values of the heat transfer coefficient and of a step change in its value during solidification were investigated. The experimental results are in good agreement with a theoretical solution developed in this work and with the two published theoretical solutions of this problem. These solutions were all developed by the use of the integral profile method. At positive superheat only the solidification of lead was studied. The two conditions used in the liquid metal were a completely still liquid and a liquid agitated with sufficient vigour to ensure the absence of temperature gradients. In both cases the effects of different values of the heat transfer coefficient and the amount of superheat were investigated. With a vigorously agitated liquid all the superheat was removed before the start of solidification which occurred as in the zero superheat case. The experimental results are in good agreement with the integral profile solutions developed for the case of zero superheat providing a displaced zero is used to account for the removal of superheat. With a still liquid superheat is removed during solidification which therefore occurs differently to the zero superheat case. Existing integral profile solutions cannot meaningfully be applied to this case.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available