Experimental Study of the Two-Phase Flow Patterns of Air-Water Mixture at Vertical Bend Inlet and Outlet
Air-water two-phase flow in pipes introduces a noticeable challenge due to the complexity of the fluids. Thus, to estimate the best design and reasonable financing cost of the transportation pipelines where the bends are presenting a part of their accessories, the investigators should have been able to estimate the flow regime occurring at different directions. An experiment was carried out by using a 90o bend fixed with two pipes where the flow was upstream from a vertical to a horizontal pipe which were representing the bend inlet and outlet respectively. Two wire-mesh sensors were used for obtaining the data of the void fractions (α) at water superficial velocities (Usl) which changed from 0.052 to 0.419m/s, and air superficial velocities (Usg) from 0.05 to 4.7m/s. Furthermore, the characterization of flow regimes of the air-water flow at both bend inlet and outlet were competed accurately by using void fraction analysis of the time series, Power Spectral Density (PSD), tomographic images observed by the sensor program, and the Probability Density Function (PDF) method. The flow regimes of vertical flow lines at the bend inlet were observed as bubbly, cap-bubble, slug, and churn flow, whereas the flow regimes of the horizontal flow line at the bend outlet were characterized as having stratified, stratified wavy, bubbly, plug, slug, wavy annular, and semi-annular flow due to the gravity and bend effects.
Keywords:flow pattern in vertical pipes, flow pattern in horizontal pipes, air-water flow, wire mesh sensor (WMS), two-phase flow at bends
C. T. Crowe, Multiphase Flow Handbook, CRC Press, 2005 DOI: https://doi.org/10.1201/9781420040470
M. J. Da Silva, Impedance Sensors for Fast Multiphase Flow Measurement and Imaging, PhD Thesis, Technische Universität Dresden, 2008
G. C. Gardner, P. H. Neller, “Phase distributions in flow of an air-water mixture round bends and past obstructions at the wall of a 76‐mm bore tube”, Proceedings of the Institution of Mechanical Engineers, Vol. 184, No. 33, pp. 93-101, 1969 DOI: https://doi.org/10.1243/PIME_CONF_1969_184_084_02
S. Kim, J. H. Park, G. Kojasoy, J. M. Kelly, “Local interfacial structures in horizontal bubbly flow with 90-degree bend”, 14th International Conference on Nuclear Engineering, July 17-20, 2006 DOI: https://doi.org/10.1115/ICONE14-89221
J. D. Talley, S. Kim, T. Guo, G. Kojasoy, “Geometric effects of 45-deg elbow in horizontal air-water bubbly flow”, Nuclear Technology, Vol. 167, No. 1, pp. 2–12, 2009 DOI: https://doi.org/10.13182/NT167-2
Y. Liu, M. Shuichiro, H. Takashi, I. Mamoru, M. Hideyuki, K. Yoshiyuki, K. Koichi, “Experimental study of internal two-phase flow induced fluctuating force on a 90° elbow”, Chemical Engineering Science, Vol. 76, No. 2012, pp. 173–187, 2012 DOI: https://doi.org/10.1016/j.ces.2012.06.002
F. Saidj, R. Kibboua, A. Azzi, N. Ababou, B. J. Azzopardi, “Experimental investigation of air-water two-phase flow through vertical 90° bend”, Experimental Thermal and Fluid Science, Vol. 57, pp. 226–234, 2014 DOI: https://doi.org/10.1016/j.expthermflusci.2014.04.020
L. A. Abdulkareem, Tomographic Investigation of Gas-Oil Flow in Inclined Risers, PhD Thesis, University of Nottingham, 2011
M. De Salve, G. Monni, B. Panella, “Horizontal air-water flow analysis with wire mesh sensor”, in: 6th European Thermal Sciences Conference (Eurotherm 2012), IOP Publishing, 2012 DOI: https://doi.org/10.1088/1742-6596/395/1/012179
A. E. Dukler, M. G. Hubbard, “A Model for gas-liquid slug flow in horizontal and near horizontal tubes”, Industrial & Engineering Chemistry Fundamentals, Vol. 14, No. 4, pp. 337–347, 1975 DOI: https://doi.org/10.1021/i160056a011
W. Liu, C. Tan, F. Dong, “Local characteristic of horizontal air-water two-phase flow by wire-mesh sensor”, Transactions of the Institute of Measurement and Control, Vol. 40, No. 3, pp. 746-761, 2016 DOI: https://doi.org/10.1177/0142331216665689
H. F. Velasco Pena, O. M. H. Rodriguez, “Applications of wire-mesh sensors in multiphase flows”, Flow Measurement and Instrumentation, Vol. 45, pp. 255–273, 2015 DOI: https://doi.org/10.1016/j.flowmeasinst.2015.06.024
H. M. Prasser, A. Bottger, J. Zschau, “A new electrode-mesh tomography for gas-liquid flows”, Flow Measurement and Instrumentation, Vol. 9, No. 2, pp. 111–119, 1998 DOI: https://doi.org/10.1016/S0955-5986(98)00015-6
I. D. Johnson, Method and Apparatus for Measuring Water in Crude Oil, United States Patent 4644263, 1987
D. J. Nicklin, J. O. Wilkes, J. F. Davidson, “Two-phase flow in vertical tubes”, Proceedings of the Institution of Mechanical Engineers, Vol. 40, No. 1, pp. 61–68, 1962
How to Cite
MetricsAbstract Views: 534
PDF Downloads: 249 Wire mesh sensor Downloads: 0 pipes structure Downloads: 0 pipes structure Downloads: 0 Untitled Downloads: 0
Authors who publish with this journal agree to the following terms:
- Authors retain the copyright and grant the journal the right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) after its publication in ETASR with an acknowledgement of its initial publication in this journal.