Local solidification time

Where, Ds is the diffusion coefficient of solute in the solid phase in ernes, solidification time in seconds, and Ajis the secondary dendrite arm spacing in cm. Local solidification time (in seconds) is defined as follows ... 

A theoretical estimate of the temperature course at the inner wall surfaces of a 200 1 extraction vessel (solution via Laplace transformation) is shown in Figure 10. The recognisable deviations from the experimentally-measured course are attributed both to the decrease in heat transfer with time and to the lack of consideration of the enthalpy of solidification which is released during the formation of dry ice. It has also proved necessary to record the local temperatures which differ greatly during pressure release. 

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