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Combining electrical resistance tomography (ERT) with the cross-correlation flow measurement technique can provide more information on the flow than usual. A dual-plane ERT system for use on laboratory-and plant-scale process equipment has been developed on the basis of this idea. This paper focuses on the design of it. The principle of measurement of the local gas velocity distribution in a bubbly gas/liquid pipe flow based on pixel-pixel cross correlation of two plane images is described. Methods to improve the real-time performance of the system are also discussed in detail. Initial experimental results illustrate the feasibility of the method presented here.

Identification of two-phase flow regimes is required in many industrial processes; however, it is difficult to perform this objectively. This paper introduces the TERT-II prototype developed in Tianjin University and the process by which we applied it to identify flow regimes of air/water and oil/water flows in horizontal, inclined and vertical pipes. The corresponding software package of this system was developed under the Windows 95/98 platform. It included data acquisition, data processing, image reconstruction and identification of flow regimes. The air/water and oil/water experiments were carried out with different experimental set-ups.It is shown that identification of flow regimes and estimates of some parameters of two-phase flow are possible through image reconstruction, data analysis and processing, and a set of criteria is specially presented to identify flow regimes in horizontal pipes.