Capacitance sensor for hold-up measurement in high-viscous-oil/conductive-water core-annular flows

Liquid holdup measurement with double helix capacitance sensor in horizontal oil–water two-phase flow pipes

“…For the DO/W and DO/W&W flows, due to the electrical losses which resulted from the contact of conductive water and pipe [15,30,35], the sensitivity of the double helix capacitance sensor is much lower. For the DW/O flow, the capacitance sensor shows better sensitivity and linearity, which is accordance with the previous work of other scholars, and leads to wide applications of the capacitance sensor when the nonconductive phase is the only one in contact with pipe [13].…”

“…Similarly, for the ST flow, the continuous oil phase at the upper part of the pipe leads to negligible electrical losses [35]. There exists a good linear relationship between sensor response and oil holdup, and the double helix capacitance sensor shows great performance in the sensitivity.…”

“…To address this issue, Jaworek et al [36] have used an 80 MHz oscillator to overcome the conductive effect of water, but the high working frequency entails problem related to the measurement circuit. It has been shown that large axial length of electrode [35] and large range edge guarding electrode [24] can greatly reduce the current losses.…”

Experimental and Numerical study for Multi-Phases flow Measurement by Microwave Cavity

“…The literature survey shows many researchers working on different methods and using different techniques such as Z.Y. Wang et al (2010) [2], Domenico Strazza et al (2011) [ 3], Ajmal Shah et al (2013) [4], Chao Tan et al (2013) [5], Marco Joseda Silva and Uwe Hampel (2013) [6], Yu.P. Filippov et al (2014) [7], El Abd (2014) [8], Zhao An et al (2014) [9], Chao Tan et al (2014) [10].…”

Differential C4D sensor for conductive and non-conductive fluidic channel

“…Capacitive sensor structures as the contactless mechanism are often used to measure the phase flow detection such as air-water-oil (Quoc et al 2015;Demori et al 2010;Strazza et al 2011). However, the sensor sensitivity of the capacitive configuration is low in case of high conductivity liquid due to the much small resistance value of the conductive fluidic channel in comparison with the sensor capacitance (Strazza et al 2011). Jaworek et al presents a high frequency capacitance sensor to solve the conductive effects of water using an 80 MHz oscillator.…”