An Analytical Approach of Bubble Departure by Sliding in Vertical Flow Boiling
Résumé
Bubble departure by sliding is a quasi-systematically observed phenomenon in vertical flow boiling. The prediction of the diameter at which bubble sliding begins is required if one wishes to properly model the wall boiling phenomenon, which is a primal goal in the nuclear industry. An approach based on recent expressions for the force balance such as drag and added mass is proposed. The dimensionless analysis provides a way to determine dominant forces triggering departure in experimental measurements at low and high pressures. While added mass seems to be the stronger detaching force at atmospheric pressure, drag appears to be the dominant one when pressure increases. Predictions of departure diameter through a critical radius in the dimensionless force balance shows a reasonable trend with experimental data while having a reduced number of arbitrary choices in the modeling compared to other existing approaches. The proposed work will be applied to the lift-off phenomenon and could be enriched with more experimental measurements as well as finer modeling of the bubble growth by accounting for liquid subcooling and liquid temperature field.
| Origine | Fichiers produits par l'(les) auteur(s) |
|---|---|
| Licence |