Evaluation of electrical resistance tomography with voltage excitation compared with electrical capacitance tomography

Ruican Wang, Marco Rodriguez Frias, Haigang Wang, Wuqiang Yang, Jiamin Ye

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    Abstract

    Normally, a gas–solids flow should be non-conductive. With the increase in moisture content in a gas–solids flow, the non-conductive flow may become low-conductive. For the measurement of low-conductive materials, i.e. particles with high moisture content, in the pharmaceutical industry, both electrical capacitance tomography (ECT) and traditional electrical resistance tomography driven by current (ERTc) generate poor images. An ERT driven by voltage (ERTv) may be suitable for the measurement of materials with low-conductivity. In this research, ERTv is used for the measurement of a wet gas–solids flow with different moisture content and different flow patterns, as well as a gas–liquid flow with different flow patterns. In the meantime, ECT is also used for the same flow conditions for comparison. The measurement results of ERTv and ECT are evaluated by the correlation coefficient. The results show that ERTv is good for measurement of a gas–solids flow with high moisture content and a gas–liquid flow when the conductivity of the continuous phase is low or moderate, while ECT is suitable for the measurement of a dry gas–solids flow.
    Original languageEnglish
    Article number125401
    Number of pages10
    JournalMeasurement Science and Technology
    Volume29
    Issue number12
    Early online date17 Oct 2018
    DOIs
    Publication statusPublished - 16 Nov 2018

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