Multiphase Science and Technology A Quarterly

ISSN for PRINT: 0276-1459

For Online Access

Best Paper Award Selection - Editorial Board Site

2004, Volume16

Issue 4

111 pages

DOI: 10.1615/MultScienTechn.v16.i4

Issue price - $140.00

Amos Ullmann
Department of Fluid Mechanics, School of Mechanical Engineering, Tel-Aviv University, Tel-Aviv 6997, Israel

Neima Brauner
School of Engineering, Tel-Aviv University, Tel-Aviv, Israel

The exact solution for laminar core-annular flow (CAF) in inclined pipes is used to derive new closure relations for the wall and interfacial shear stresses. These are incorporated in a two-fluid model for CAF. With these closure relations, the two-fluid model yields the exact solution for the hold-up and pressure drop in case of laminar horizontal or inclined CAF. It is shown that multiple solutions can be obtained in upward or downward inclined systems. The multiple solution regions are identified in terms of the controlling dimensionless parameters. The predictions of the two-fluid model for laminar and turbulent CAFs are tested against experimental data available from the literature for oil-water systems. The good comparison suggests the two-fluid model as convenient tool for evaluating the pressure drop and holdup in CAF.

DOI: 10.1615/MultScienTechn.v16.i4.50 Download article, 355-387 pages

Article price - $45.00

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