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A new method for describing transport processes in one-component two-phase flows based on an explicit modelling of the specific interfacial area (interfacial area concentration) and its evolution in time and space is presented. A balance equation for the specific interfacial area is derived taking into account source terms and convective changes of this quantity. Source terms are formulated for disperse two-phase flow (gas/vapour bubbles or droplets). They are in general associated with bubble/droplet coalescence or breakup, variation of local void fraction due to pressure change and local evaporation or condensation processes while the convective terms arise from the moment of the disperse phase relative to the mixture. The new model has been implemented within the JRC Ispra code for inhomogeneous two-phase flow. Predicted results for a fast blowdown transient and a transient bubble column experiment as well are presented. The model is shown to describe satisfactorily experimental findings taken for comparison.

Additional information

Authors: BLAHAK A, JRC Ispra (IT)
Bibliographic Reference: EUR 17719 DE (1997) pp. 124, FS, free of charge
Availability: Available from the Public Relations and Publications Unit, JRC Ispra, I-21020 Ispra (IT), Fax: +39-332-785818
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