Transition of Gas-Liquid Stratified Flow in Oil Transport Pipes

D. Lakehal, M. Labois, D. Caviezel, B. Belhouachi

Abstract


 Large-Scale Simulation results of the transition of a gas-liquid stratified flow to slug flow regime in circular 3D oil transport pipes under turbulent flow conditions expressed. Free surface flow in the pipe is treated using the Level Set method. Turbulence is approached via the LES and VLES methodologies extended to interfacial two-phase flows. It is shown that only with the Level Set method the flow transition can be accurately predicted, better than with the two-fluid phase-average model. The transition from stratified to slug flow is found to be subsequent to the merging of the secondary wave modes created by the action of gas shear (short waves) with the first wave mode (high amplitude long wave). The model is capable of predicting global flow features like the onset of slugging and slug speed. In the second test case, the model predicts different kinds of slugs, the so-called operating slugs formed upstream that fill entirely the pipe with water slugs of length scales of the order of 2-4 D, and lower size (1-1.5 D) disturbance slugs, featuring lower hold-up (0.8-0.9). The model predicts well the frequency of slugs. The simulations revealed important parameter effects on the results, such as two-dimensionality, pipe length, and water holdup.

 


Keywords


Stratified flow, Two-phase flow, Level-set method

Full Text:

PDF

References


Collins R, Moraes DE, Davidson JF, Harrison D (1978), The motion of a large gas bubble rising through liquid flowing in a tube. J. Fluid Mech. 89(3):497-514.

Hewitt GF (1982), Handbook of multiphase systems. Ed. G. Hestroni, Hemisphere /McGraw-Hill.

Labois M, Lakehal D (2011), Very-large eddy simulation (V-LES) of the flow across a tube bundle. Nucl. Eng. Design 241:2075-2085.

Lakehal D (2010), LEIS for the prediction of urbulent multifluid flows for thermal hydraulics applications. Nucl. Eng. Design 240:2096-2106.

Lakehal D (2008), Large-scale simulation of stratified gas-liquid flow transition and slug in oil pipes. 6th Int. Conf. CFD in Oil & Gas, Metallurgical & Process Industries, SINTEF/NTNU, Trondheim NORWAY.

Lakehal D, Meier M, Fulgosi M (2002), ITM for the prediction of interfacial dynamics and mass transfer in multiphase flows. Int. J. Heat & Fluid Flow 23:242-255.

Lin PY, Hanratty TJ (1986), Prediction of the initiation of slugs with linear stability theory. IJMF 12:79-98.

Liovic P, Lakehal D (2007), Interface-turbulence interactions in large-scale bubbling processes. Int. J. Heat & Fluid Flow 28:127-144.

Martin CS, Brown R, Brown J (2005), Condensationinduced hydraulic shock laboratory study. Final Report, (ASHRAE).

Sussman M, Smereka P, Osher S (1994), A level set approach for incompressible two-phase flow. JCP 114:146-158.

Taitel Y, Dukler AE (1976), A model for flow regime transitions in horizontal and near horizontal gasliquid flow. AlChE J 22:47-55.

TransAT User Manual. ASCOMP GmbH, 2010. www.ascomp.ch/transat.

Ujang PM (2003), Studies of slug initiation and development in two-phase gas-liquid pipeline flow. PhD Thesis, University of London, London, UK.

Valluri P, Spelt PDM, Lawrence CJ, Hewitt GF (2008), Numerical simulation of the onset of slug initiation in laminar horizontal channel flow. IJMF 34:206-225.




DOI: http://dx.doi.org/10.24200/tjer.vol8iss2pp49-58

Refbacks

  • There are currently no refbacks.




Copyright (c) 2017 D. Lakehal, M. Labois, D. Caviezel, B. Belhouachi

Creative Commons License
This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.

TJER 2017-CC BY-ND

This journal and its content is licensed under a Attribution-NoDerivatives 4.0 International.

Flag Counter