Abstract
The stability of a specific forced convection cooled conductor is analysed with two dynamic models of different complexity. We compare the dynamic analysis with static criteria. First we introduce a dynamic model of the conductor where the coolant is modelled as a constant temperature bath. A constant heat transfer coefficient is assumed. We found a critical energy that is not a function of the disturbed length for small sizes, and is proportional to the disturbed length for larger sizes. To introduce transient effects in the helium flow we solved a two dimensional flow and thermal model of the coolant. We present some characteristics of the transient behaviour. Critical energy appears to increase from 4 mJ to 15 mJ when transient effects are considered.
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