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Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 332 / 2 / b / iv

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2019 iii Paper 332 2 b
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iv
Impose the eutectic temperature at ζ=0 in the large-concentration thermal profile of a pulled mush:
−1=−Ωθ∞​​(erΩH−1).
(1)
Therefore
κVh​=H=rΩ1​log(1+θ∞​Ω​),Ω=1+rCS​.​
(2)
The thickness is proportional to thermal diffusivity divided by pulling speed. Latent-heat release modifies the exponential decay rate through Ω, while the far-liquid temperature fixes how far the profile can remain below the liquidus.

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