Axial development of annular, churn and slug flows in a long vertical tube

Document Type

Article

Publication Date

12-1-2013

Abstract

Experimental data are presented on the axial development of gas-liquid flows in a 42-m long, 0.048-m ID tube system. Different transitional models for slug, churn and annular flow regimes were compared with visual observations and showed reasonable agreement for locations L/D=560 and 820. The behavior of liquid holdup and frequency of flow structures (large waves, disturbance waves) were also analyzed for three different axial positions (L/D=102, 521 and 815), over a range of pressure between 1.4 and 5.2bar, liquid mass fluxes ranging from 17 to 319kg/m2-s and dimensionless gas velocities from 0.05 to 1.6. The liquid holdup showed significant axial variation at all monitoring locations for higher liquid mass fluxes, while it appeared that a kind of developed flow was reached at L/D=521 for lower liquid mass fluxes. The flow structure frequency did not exhibit significant axial variation for dimensionless gas velocities (Wallis parameter) between 0.2 and 1.6. © 2013 Elsevier Ltd.

Publication Source (Journal or Book title)

International Journal of Multiphase Flow

First Page

38

Last Page

48

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