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An approximate theory is presented for solidification in a finite,initially overheated slab in which one wall isinsulated and the other is subject to an instantaneous temperature drop below the freezing point.The simpleexpressions for the position of the phase change front as a function of time are derived.The results are com-pared with experimental data,numerical and approximate solutions as well as exact solution presented in otherliterature,and good agreement is attained.It is shown that the approximate method proposed herein is alsovalid for phase change problems with large Stefan numbers and different boundary conditions.
An approximate theory is presented for solidification in a finite, initially overheated slab in which one wall isinsulated and the other is subject to an instantaneous temperature drop below the freezing point. Simpleexpressions for the position of the phase change front as a function of time are derived.The results are com-pared with experimental data, numerical and approximate solutions as well as exact solution presented in other literatures, and good agreement is attained. It is shown as the approximate method proposed herein is also valid for phase change problems with large Stefan numbers and different boundary conditions.