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Capacitance electrode systems for the measurement of the volumetric concentration of two-phase flows have inherently non-uniform sensitivity distributions over the pipe cross section and therefore have different responses to different flow regimes (e.g. core, annular and stratified flows). In processes with varying flow regimes, this can lead to significant measurement errors. An electrode system which has a uniform sensitivity distribution and consequently a response independent of flow regime is therefore desirable. The system performance parameters of surface electrode systems used with stray-immune measurement transducers have been characterised quantitatively using a two-dimensional finite-element model. The electrode system design parameters have also been identified and their effects on system performance parameters have been investigated. As a result, optimum electrode designs are proposed, with responses to different flow regimes having a minimum deviation from linearity.

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Articles you may be interested inTomographic imaging system for measuring impurity line emission in a field-reversed configurationa) Rev. Sci. Instrum. 83, 10E503 (2012); 10.1063/1.4729670Tomographic image analysis in representative measurements of soil density AIP Conf.UMIST is one of the establishments where process tomography techniques were first developed. This paper introduces the development of capacitance tomographic imaging systems at UMIST for oil pipeline measurements. The principles of electrical capacitance tomography (ECT) are briefly presented and two ECT systems based on charge/discharge capacitance measuring circuits are described. These systems, a PC-based &electrode system and a Transputer-based 12-electrode system, have been used to visualise oil pipelines. Future developments of ECT technology are discussed, including a low-cost PC-based ECT system, a twin-plane ECT system which can measure the velocity profile of a pipeline flow, a multi-frequency ECT system using ac capacitance measuring circuits and an ECT system with a rotating parallel excitation field. 0 2995 American Institute of Physics.4326

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