The Effect of Slightly Upward and Downward Inclined Pipes on the Stability of Gas-Oil Two-Phase Flow

Peyman Sabzi; Saheb Noroozi

doi:10.22146/ajche.49712

The Effect of Slightly Upward and Downward Inclined Pipes on the Stability of Gas-Oil Two-Phase Flow

https://doi.org/10.22146/ajche.49712

Peyman Sabzi^(1*), Saheb Noroozi⁽²⁾

(1)
(2)
(*) Corresponding Author

Abstract

Pipeline inclination has an important effect on the stability of two-phase flow and flow assurance in the pipeline. This inclination may be intentional; it may be inevitable in pipeline installation; or it may be due to an error in pipeline installation. In this situation, even the slight inclination of the pipe plays an important role in the growth or elimination of the instability of the two-phase flow. In this study using a code designed for the analysis of pipelines’ two-phase flow, the stability of the two-phase flow for Kerosene oil flow along with methane gas has been compared in downward inclined pipes, upward inclined pipes, and horizontal pipes. Using the mentioned computer code, it has been proved that the pipe’s upward inclination results in the increase of two-phase flow instability, while the pipe’s downward inclination is helpful in two-phase flow stability. In order to model two-phase flow in the pipe, two-fluid model has been used. This model considers each phase separately and the equations of mass conservation and momentum are written for each phase. The momentum exchange between the two phases and between each phase and the pipe wall has been considered. Conservation equations have been solved using SIMPLE algorithm in a numerical form with finite volume method.

Keywords: Pipes, Two-Phase Flow, Inclined Stability, Two-Fluid Model

Keywords

Pipes, Two-Phase Flow, Inclined Stability, Two-Fluid Model

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References

1. Andreussi, P., & Persen, L. (1987). Stratified gas-liquid flow in downwardly inclined pipes.
International journal of multiphase flow, 13(4), 565-575.
2. Ansari, M. R. (1998). Dynamical behavior of slug initiation generated by short waves in two-phase air-water stratified flow. ASME HEAT TRANSFER DIV PUBL HTD, 361, 289-296.
3. Barnea, D., Shoham, O., Taitel, Y., & Dukler, A. (1980). Flow pattern transition for gas-liquid flow in horizontal and inclined pipes. Comparison of experimental data with theory. International journal of multiphase flow, 6(3), 217-225.

4. Barnea, D., & Taitel, Y. (1994). Interfacial and structural stability of separated flow. International journal of multiphase flow, 20, 387-414.
5. Bruce Stewart, H., & Wendroff, B. (1984). Two-phase flow: models and methods. Journal of Computational Physics, 56(3), 363-409.
6. De Henau, V., & Raithby, G. (1995). A transient two-fluid model for the simulation of slug flow in pipelines—I. Theory. International journal of multiphase flow, 21(3), 335-349.

7. Dukler, A., & Fabre, J. (1994). GAS- LIQUID SLUG FLOW. Multiphase science and technology, 8(1-4).

8. Grolman, E., Commandeur, N. C., de Baat, E. C., & Fortuin, J. M. (1996). Wavy‐to‐slug flow transition in slightly inclined gas–liquid pipe flow. AIChE journal, 42(4), 901-909.
9. Hand, N. P. (1991). Gas liquid co-current flow in a horizontal pipe. Queen's University of Belfast.
10. Issa, R., & Kempf, M. (2003). Simulation of slug flow in horizontal and nearly horizontal pipes with the two-fluid model. International journal of multiphase flow, 29(1), 69-95.
11. Lockhart, R., & Martinelli, R. (1949). Proposed correlation of data for isothermal two-phase, two-component flow in pipes. Chem. Eng. Prog, 45(1), 39-48.
12. Stanislav, J., Kokal, S., & Nicholson, M. (1986). Intermittent gas-liquid flow in
upward inclined pipes. International journal of multiphase flow, 12(3), 325-335.

13. Taitel, Y., & Dukler, A. (1976). A model for predicting flow regime transitions in horizontal and near horizontal gas‐ liquid flow. AIChE journal, 22(1), 47-55.

14. Woodburn, P., & Issa, R. (1998). Well- posedness of one-dimensional transient, two fluid models of two-phase flows. Paper presented at the 3rd International Symposium on Mulitphase Flow, ASME Fluids Engineering Division Summer Meeting, Washington, USA.

15. Z Fan, Z., & Hanratty, T. (1993). Pressure profiles for slugs in horizontal pipelines. International journal of multiphase flow, 19(3), 421-437.

DOI: https://doi.org/10.22146/ajche.49712