Investigation in Gas-Oil Two-Phase Flow using a Differential Pressure Transducer and Wire Mesh Sensor in Vertical Pipes

  • Veyan A. Musa Department of Mechanical Engineering, University of Zakho, Kurdistan Region of Iraq
  • Raid A. Mahmood School of Mechanical and Electrical Engineering, University of Southern Queensland, Australia
  • Sherwan M. Simo Department of Petroleum Engineering, University of Zakho, Kurdistan Region of Iraq, Iraq
  • Abbas Kh. Ibrahim Department of Petroleum Engineering, University of Zakho, Kurdistan Region of Iraq, Iraq
  • Lokman A. Abdulkareem Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
Keywords: Wire-mesh sensor, Pressure drops in pipes, Two-phase flow pattern, Differential Pressure transducers (DPT)


The current study is performed to identify the flow regimes of oil-gas two-phase flow experimentally in a vertical pipe has an internal diameter of 6.7 cm. It also aims to provide more details about the possibility of using Differential Pressure Transducers (DPT) for indicating flow patterns. A flow development of oil and gas has been investigated in a vertical pipe of 6 m in length and operated at atmospheric pressure. A series of experiments have been run to cover a range of inlet oil superficial velocities from 0.262 to 0.419 m/s, and inlet gas superficial velocities from 0.05 to 4.7 m/s. Wire Mesh Sensors (WMS) have been used to collect the obtained void fraction values of the flow. The Differential Pressure Transducer (DPT) is utilized to measure the pressure drop values of a one-meter along the pipe. The flow patterns are classified according to the analysis of void fractions, pressure gradients regarding time series, tomographic images, probability density functions of the void fractions, and pressure gradients. A bubbly flow is observed at low superficial velocities of gas and liquid, slug flow is observed at the lower flow rate of liquid and moderate flow rates of gas, while the churn flow pattern is recognized at the higher rates of liquid and gas. Also, the result has revealed the possibility of using Differential Pressure Transducers (DPT) to classify the gas-oil flow patterns in vertical pipes.


Download data is not yet available.


Omar R., Hewakandamby B., Azzi A., and Azzopardi B. Fluid Structure Behaviour in Gas-oil Two-phase Flow in a Moderately Large Diameter Vertical Pipe. Chemical Engineering Science, 2018; 187: 377–390. DOI:

Ahmed S. K. B., Aliyu M. A., Baba Y. D., Abdulkadir M. Abdulhadi R. O., Lao L. and Yeung H. Comparative Analysis of Riser Base and Flowline Gas Injection on Vertical Gas-Liquid Two-Phase Flow. Energies, 2022; 15(19). DOI:

Zahedi R. and Babaee Rad A. Numerical and Experimental Simulation of Gas-liquid Two-phase Flow in 90-degree Elbow. Alexandria Engineering Journal, 2021; 61(3): 2536-2550. DOI:

Zou S., Guo L., and Yao T. Upstream-Flow-Based Mechanisms for Global Flow Regime Transition of Gas/Liquid Two-Phase Flow in Pipeline-Riser Systems. Chemical Engineering Science, 2021; 240: 116542. DOI:

Mahmood RA, Saleh K, Musa VA, Massoud E, Sharifian-Barforoush A, Abdulkareem LA. Two-Phase Flow Development of R134a in a Horizontal Pipe: Computational Investigation. International Journal of Heat and Technology. 2021; 39(5): 1532–40. DOI:

Nugroho, S. and Hidayatulloh A.A., Performance Analysis of The Effect on Insertion Guide Vanes For Rectangular Elbow 900 Cross Section. EMITTER International Journal of Engineering Technology, 2016; 4(2): 358-370. DOI:

Liu Z. Liao R., Luo W., Ribeiro J. X. F., and Su Y. Friction Pressure Drop Model of Gas-Liquid Two-Phase Flow in an Inclined Pipe with High Gas and Liquid Velocities. AIP Advances, 2019; 9(8). DOI:

Wallis G. B. One Dimensional Two Phase Flow. USA: McGraw-Hill Book Company; 1969.

Lin Z, Liu X, Lao L, Liu H. Prediction of Two-Phase Flow Patterns in Upward Inclined Pipes Via Deep Learning. Energy. 2020;210: 118541. DOI:

Dang Z., Wang G., and Ishii M. Two-phase interfacial structure of bubbly-to-slug transition flows in a 12.7 mm ID vertical tube. International Journal of Heat and Mass Transfer, 2021; 165: 120556. DOI:

Prasser HM, Böttger A, Zschau J. A new Electrode-Mesh Tomograph for Gas-Liquid Flows. Flow Measurement and Instrumentation. 1998; 9(2): 111–9. DOI:

Wiedemann P., Döß A., Schleicher E., and Hampel U. Fuzzy flow pattern identification in horizontal air-water two-phase flow based on wire-mesh sensor data. International Journal of Multiphase Flow, 2019; 117: 153–162. DOI:

Vieira RE, Parsi M, McLaury BS, Shirazi SA, Torres CF, Schleicher E, et al. Experimental characterization of vertical downward two-phase annular flows using Wire-Mesh Sensor. Chemical Engineering Science [Internet]. 2015; 134:324–39. DOI:

Hernandez-Alvarado F., Kleinbart S., Kalaga D. V., Banerjee S., Joshi J. B., and Kawaji M. Comparison of void fraction measurements using different techniques in two-phase flow bubble column reactors. International Journal of Multiphase Flow, 2018; 102: 119–129. DOI:

Velasco Peña HF, Rodriguez OMH. Applications of wire-mesh sensors in multiphase flows. Flow Measurement and Instrumentation, 2015; 45: 255–73. DOI:

Chalgeri V. S. and Jeong J. H. Flow regime identification and classification based on void fraction and differential pressure of vertical two-phase flow in rectangular channel. International Journal of Heat and Mass Transfer, 2019; 132: 802–816. DOI:

Musa VA, Mahmood RA, Khalifa SMN, Ali OM, Abdulkareem LA. Flow Patterns of Oil-Gas and Pressure Gradients in Near-Horizontal Flow Pipeline : Experimental Investigation Using Differential Pressure Transducers. 2021; 39(2): 621–8. DOI:

Musa VA, Abdulkareem LA, Ali OM. Experimental Study of the Two-Phase Flow Patterns of Air-Water Mixture at Vertical Bend Inlet and Outlet. Engineering, Technology & Applied Science Research. 2019; 9(5): 4649–53. DOI:

Abdulkareem LA, Musa VA, Mahmood RA, Hasso EA. Experimental Investigation of Two-Phase Flow Patterns in a Vertical to Horizontal Bend Pipe Using Wire-Mesh Sensor. Revista de Chimie. 2021; 71(12): 18–33. DOI:

Abdulkadir M, Jatto DG, Abdulkareem LA, Zhao D. Pressure drop, void fraction and flow pattern of vertical air–silicone oil flows using differential pressure transducer and advanced instrumentation. Chemical Engineering Research and Design, 2020; 159(2012): 262–77. DOI:

Adaze E., Badr H. M., and Al-Sarkhi A. CFD modeling of two-phase annular flow toward the onset of liquid film reversal in a vertical pipe. Journal of Petroleum Science and Engineering, 2019; 175: 755–774. DOI:

Yang Z., Dang Z., Yang X., Ishii M., and Shan J. Downward two phase flow experiment and general flow regime transition criteria for various pipe sizes. International Journal of Heat and Mass Transfer, 2018; 125: 179–189. DOI:

Qiao S., Mena D., and Kim S. Inlet effects on vertical-downward air–water two-phase flow. Nuclear Engineering and Design, 2017; 312: 375–388. DOI:

Abdulkareem LA. Tomographic investigation of gas-oil flow in inclined risers. PhD thesis, University of Nottingham; 2011.

Coleman, H. W., and Glenn S. W. Experimentation, validation, and uncertainty analysis for engineers. John Wiley & Sons, 2018. DOI:

Hameed, A.I., L.A. Abdulkareem, and R.A. Mahmood, Experimental Comparison Between Wire Mesh and Electrical Capacitance Tomography Sensors to Predict a Two-Phase Flow Behaviour and Patterns in Inclined Pipe. 2021. DOI:

Mahmood R. A., Saleh K., Musa V. A., Massoud E., and Al-lwayzy S. H. CFD Simulations and Experimental Observation for Air-Water Two-phase Flow in a Vertical Pipe. Gongcheng Kexue yu Jishu. 2022; 54(06): 2363–2375.

Azzi A., Bouyahiaoui H., Berrouk A. S., Hunt A., and Lowndes I. S. Investigation of fluidized bed behaviour using electrical capacitance tomography. Canadian Journal of Chemical Engineering, 2020; 98(8): 1835–1848. DOI:

How to Cite
Musa, V. A., Mahmood, R. A., Simo, S. M., Ibrahim, A. K., & Abdulkareem, L. A. (2022). Investigation in Gas-Oil Two-Phase Flow using a Differential Pressure Transducer and Wire Mesh Sensor in Vertical Pipes. EMITTER International Journal of Engineering Technology, 10(2), 262-278.