Abstract
This paper presents the feasibility study of dynamic flow measurements using the concept of a rotatable electrical capacitance tomography (ECT) sensor. The experiment considered horizontal flow in a pneumatic conveying flow loop in the case of dense phase flow. Slugs and settled layers were imaged and a comparison was made between no rotation or rotation of the sensor for two image reconstruction schemas: linear back projection (LBP) and non-linear iterative back projection. Data were evaluated both qualitatively and quantitatively by estimating the solids concentration level for different hue levels.
Highlights
Electrical capacitance tomography (ECT) has proven to be a very suitable technique for flow control applications such as flow rate, flow regime, and real-time material distribution and concentration estimation [1,2,3,4,5]
This paper presented the first results that deal with the use of a rotatable ECT sensor in dynamic mode during horizontal pneumatic conveying
The use of a rotatable sensor with 12 electrodes and 3 rotation steps achieves relatively satisfying results in terms of better surface delineation and solids concentration for the settled layer, despite the problems related to acquisition speed and noise
Summary
Electrical capacitance tomography (ECT) has proven to be a very suitable technique for flow control applications such as flow rate, flow regime, and real-time material distribution and concentration estimation [1,2,3,4,5]. The increased number of electrodes in the sensor is one key issue to reduce the ill-posedness that the technique faces. Increasing the number of capacitance electrodes while keeping the capacitance range into a measurable range implies that the shorter electrode dimension in the radial direction is compensated by increasing their length (in the axial direction). This leads to a larger averaging zone, which in most applications, is not acceptable. Increasing the number of electrodes implies a more complicated and expensive acquisition unit, which somehow goes against one of the main advantages of the technique: its relatively low price. New strategies have been thought of to increase the number of measurements
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