The increasing use of numerical methods for thermal exchangers dimensioning led to the development of several computing models able to cope with two-phase flow (with or without phase shift). Regarding the pure vapour condensation in a stratified two-phase flow, different relations are used to obtain the average heat transfer coefficients as well as among those measured. Also there is a noticeable difference between the two set of coefficients, theoretical and measured. This study has an important role to insure a constant liquid level in the column for hydrogen isotope separation. The thermodynamics is modelled based on Beattie-^sBridgman relation. The proposed models are addressed to high performance installations, especially to those from nuclear energetic field.
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