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Advanced Imaging & Measurement for Multiphase Flows

Case 1. Two-phase mass flow measurement

A new method of two-phase mass flow measurement was reported, which were obtained from a high performance dual-plane electrical impedance tomography (EIT) system assisted by a commercial electromagnetic flowmeter and a differential pressure transmitter to obtain the velocity of the continuous phase, i.e. the water phase, and to provide an average mixture density as a reference for the volume fraction measurement with EIT, respectively (Figure 1). In the study, the uncertainty of the disperse phase distributions was evidently matched with a theoretical model (Figure 2, 3).

Figure 1:The construction of the new two-phase mass flowmeter [1].

 

Figure 2: Typical tomographic concentration profiles in the bubble flow were proved with a theoretical model (Malnes, D., Institutt for Atomenergi, Kjeller Research Establishment, Kjeller, Norway, May 1966.) [1].

 

(a)	(b)
Figure 3: Air local concentration profiles under different water flow rates (left: Qa = 5 SLPM, right: 10 SLPM) [1].

Author Information: Mi Wang, Institute of Particle Science and Engineering, School of Process, Environmental and Materials Engineering, Email: m.wang@leeds.ac.uk

References:
1. Li, H., Wang, M., Wu, Y. and Lucas, G. (2009) “Volume flow rate measurement in vertical oil-in-water pipe flow using electrical impedance tomography and a local probe”, MultScienTechn, 21(i1-2.70), 81-93.
2. Issa, M., Li, H., Schlaberg, H.I., Wang, M. and Williams, R.A. (2009) “Velocity measurements of multi-phase unsteady flow in oscillatory baffled reactor using electrical resistance tomography”, in Proceedings of 3rd International Workshop on Process Tomography (IWPT-3), Tokyo, Japan.
3. Ramskill, N.P. and Wang, M. (2010) “Measurement and Recognition of Gas-Liquid Multiphase Horizontal Flow Regimes using Electrical Resistance Tomography”, in Proceedings of 6th World Congress on Industrial Process Tomography, Beijing.