Powder Technology, Vol.364, 310-320, 2020
Particle volume flow rate measurement by combination of dual electrical capacitance tomography sensor and plug flow shape model
Particle volume flow rate <(Q)over dot>(PLUG) in plug flow through a cross section of horizontal pipe has been accurately measured by a combination of dual electrical capacitance tomography sensor and plug flow shape model (dECT-PFSM). The plug flow shape model divides the trapezoidal shape of the plug flow into three flow regions which are Tip, Filling, and Tail regions. The plug flow volume V-PLUG is estimated by velocity and length which are measured in each region by the normalized permittivity signal changes obtained from the dECT images under the plug flow in the trapezoidal shape. The path time difference of the plug flow Delta t(PLUG) is also measured. The total volume flow rate of the plug flow is subsequently obtained from the sum of the plug flow volume of the three regions divided by Delta t(PLUG). Consequently, the volume flow rate of the plug flow obtained by dECT-PFSM Q(ECT), PFSM is compared with that of high-speed camera (HSC) as reference and conventional cross-correlation (CC) method. The absolute error E-abs of the proposed method is less than that of the CC method. The dECT-PFSM method is, therefore an affordable noninvasive technique for accurate determination of the volume flow rate of the plug flow. (C) 2020 Elsevier B.V. All rights reserved.