Artículos de revistas
Simple Model For Pressure Drop In Horizontal Core Annular Flow
Registro en:
Revista Brasileira De Ciencias Mecanicas/journal Of The Brazilian Society Of Mechanical Sciences. Braz Soc Mech Sci, Rio De Janeiro, Brazil, v. 21, n. 2, p. 233 - 244, 1999.
1007386
2-s2.0-0033329589
Autor
Bannwart A.C.
Institución
Resumen
Based upon experimental data for heavy oil-water flow inside steel (26.7 mm ID) and cemented (23.9 mm ID) horizontal tubes, a very simple model for pressure drop in the core annular flow pattern was developed. The experiments were run at room temperature and the fluids used were a fuel oil (μ = 2.7 Pa.s, ρ = 989 kg/m3) and tap water, both drawn from a separator tank. First, it is shown that for both tubes the so-called 'perfect core annular flow' approach (shortly PCAF) poorly correlates the data. This is due to the waviness of the interface and turbulence in the annulus flow. These effects are taken into account in the model proposed in this paper and justify the assumption of no-slip, which was earlier concluded by the author from wavespeed measurements for the same flow (Bannwart, 1998). As a result, a very simple correlation model for the pressure gradient is derived. The model was adjusted to fit the data and generalized to other tube sizes and fluids. Different correlations for oleophilic and oleophobic pipe walls are provided. Calculations using the correlation for oleophobic pipe behavior are in very good agreement with data from another source. 21 2 233 244 Arney, M.S., Bai, R., Guevara, E., Joseph, D.D., Liu, K., Friction factor and holdup studies for lubricated pipelining-I: Experiments and correlations (1993) Int. J. Multiphase Flow, 19, pp. 1061-1076 Arney, M.S., Ribeiro, G.S., Guevara, E., Bai, R., Joseph, D.D., Cement-lined pipes for water lubricated transport of heavy oil (1996) Int. J. Multiphase Flow, 22, pp. 207-221 Bannwart, A.C., Wavespeed and volumetric fraction in core annular flow (1998) Int. J. Multiphase Flow, 24, pp. 961-974 Bobok, E., Magyari, D., Udvardi, G., Heavy oil transport through lubricated pipeline (1996) Proceedings of the 1996 SPE European Petroleum Conference, 1, pp. 239-244. , Milan, Italy, paper SPE 36841 Charles, M.E., Govier, G.W., Hodgson, G.W., The horizontal pipeline flow of equal density oil-water mixtures (1961) Can. J. Chem. Eng., 39, pp. 27-36 Oliemans, R.V.A., (1986) The Lubricating-film Model for Core-annular Flow, , Ph.D. Thesis, Delft University, The Netherlands Oliemans, R.V.A., Ooms, G., Wu, H.L., Duijvestijn, A., Core-annular oil/water flow: The turbulent-lubricating-film model and measurements in a 5 cm pipe loop (1987) Int. J. Multiphase Flow, 13, pp. 23-31 Ooms, G., Segal, A., Van Der Wees, A.J., Meerhoff, R., Oliemans, R.V.A., A theoretical model for core-annular flow of a very viscous oil core and a water annulus through a horizontal pipe (1984) Int. J. Multiphase Flow, 10, pp. 41-60 Ribeiro, G.S., (1994) Topics in the Transport and Rheology of Heavy Crude Oils, , Ph.D. Dissertation, University of Minnesota, Minneapolis Russel, T.W.F., Charles, M.E., The effect of the less viscous liquid in the laminar flow of two immiscible liquids (1959) Can. J. Chem. Eng., 37, pp. 18-24