Abstract
The two-phase flow of air/water has been investigated in two `complex' geometries: a vertical pipe with contraction and a line/riser system with a bend. Pressure recordings and optical fiber measurements have been analyzed using Auto-Regressive modeling. This type of modeling describes the data as a linear combination of previous data. It is discussed how the transition from one flow regime to an other is influenced by the flow obstructions. The Auto-Regressive modeling provides a quantitative measure of the similarity between two flow realizations. It is found that identification of flow regimes based on this measure coincides with visual observation. With the Auto-Regressive technique the width of the transition could also be quantified. Furthermore it is shown, that the upward bend stabilizes the slug flow in the vertical part downstream of the bend: the transition towards churn flow is postponed.
| Original language | English |
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| Pages (from-to) | 323-333 |
| Number of pages | 11 |
| Journal | American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD |
| Volume | 361-5 |
| Publication status | Published - 1998 |
| Externally published | Yes |
| Event | Proceedings of the 1998 ASME International Mechanical Engineering Congress and Exposition - Anaheim, CA, USA Duration: 15 Nov 1998 → 20 Nov 1998 |