Void Fraction Measurement and Signal Analysis from Multiple-Electrode Impedance Sensors

Rocha, M S F da; Simões-Moreira, José R.

doi:10.1080/01457630802186015

Cited by 50 publications

(26 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The microwave technology [ 3 , 4 , 5 , 6 ] also performs well in water conductivity measurement and water holdup measurement, which usually requires a relatively complex measurement system. The electrical methods, which mainly include the conductance method [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ] and capacitance method [ 17 , 18 , 19 ], have been widely applied in multiphase flow measurement since they have the advantages of high reliability, fast response, and relative simplicity of operation. For the water continuous multiphase flow, the conductance method is superior to the capacitance method.…”

Section: Introductionmentioning

confidence: 99%

Salinity Independent Flow Measurement of Vertical Upward Gas-Liquid Flows in a Small Pipe Using Conductance Method

Wang

Jin

Zhai

et al. 2020

Sensors

View full text Add to dashboard Cite

Flow measurement in gas-liquid two-phase flow is always a challenging work, because of the non-uniform phase distribution, severe slippage effect between phases, and different flow structures. Furthermore, the variation of salinity changes the water conductivity, which brings more difficulties to multiphase flow measurement. In this study, a methodology for flow measurement using the conductance method in gas-liquid two-phase flow with salinity change is proposed. The methodology includes the suitable conductivity detection method, the strategy of using combined sensors, and the measurement models of flow parameters. A suitable conductivity detection method that can guarantee that the sensor output is linearly proportional to the conductivity is proposed. This conductivity detection method can ensure that the sensors have a high and constant resolution in the conductivity variation caused by water holdup under the conditions of water conductivity change. Afterward, a combined sensor system consisting of a water holdup sensor, velocity sensor, and water conductivity sensor is designed and experimentally evaluated in gas-water two-phase flow in a 20 mm inner diameter pipe. Considering the non-uniform phase distribution, severe slippage effect between phases, different flow structures, and the variation of salinity, a new water holdup measurement model and flow velocity measurement models are established to achieve salinity independent water holdup measurement and flow velocity measurement for the first time.

show abstract

Section: Introductionmentioning

confidence: 99%

Salinity Independent Flow Measurement of Vertical Upward Gas-Liquid Flows in a Small Pipe Using Conductance Method

Wang

Jin

Zhai

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…The conductance sensor is sensitive to the changes in fluid field and has high measurement accuracy. Moreover, multiple-electrode conductance sensors such as four-sector conductance sensors [1,2], and rotating electrical field conductance sensors [3,4,5] showed great advantages in flow parameter measurement, as they obtained flow information from multiple channels. The plug-in conductance sensor is a cross-correlation flowmeter with two ring-shape conductance sensors embedded on the center body based on cross-correlation method [6,7,8,9], which is valid for mixture velocity measurement with high measurement accuracy.…”

Section: Introductionmentioning

confidence: 99%

A Differential Pressure Sensor Coupled with Conductance Sensors to Evaluate Pressure Drop Prediction Models of Gas-Water Two-Phase Flow in a Vertical Small Pipe

Deng¹,

Jin²,

Yang³

et al. 2019

Sensors

View full text Add to dashboard Cite

In the process of production logging to evaluate fluid flow inside pipe, logging tools that force all flow to pass through a small measuring pipe are commonly utilized for measuring mixture density. For these logging tools, studying the fluid flow phenomenon inside the small diameter pipe and improving the prediction accuracy of pressure drop are beneficial to accurately measure mixture density. In this paper, a pressure drop prediction system is designed based on a combination of an eight-electrode rotating electric field conductance sensor (REFCS), plug-in cross-correlation conductance sensor, and differential pressure sensor. This combination overcomes the limitation of the existing pressure drop prediction model that the inlet flow velocity needs to be known. An experiment is conducted in a flow loop facility with 20 mm inner diameter small pipe. The responses of the combination sensors are collected. The REFCS is used to identify flow pattern and measure water holdup. During which five flow patterns are identified by recurrence plot method, i.e., slug flow, bubble flow, churn flow, bubble-slug transitional flow, and slug-churn transitional flow. The mixture velocity of two-phase flow is determined by the plug-in conductance sensor. The differential pressure sensor provides a differential pressure fluctuation signal. Five models of prediction of pressure drop are evaluated. The mixture friction factor of gas-water two-phase flow is obtained by a fitting method based on the measured parameters and flow pattern identification using the optimal model. Then, the pressure drop can be predicted according to the measurement results of a conductance sensor and fitting relationship. The results of pressure drop prediction show that the model proposed by Ansari et al. presents a higher accuracy compared with the other four differential pressure models with the absolute average percentage deviation (AAPD) of less than 2.632%. Moreover, the accuracy of pressure drop prediction of the Zhang et al. model is improved by using the mixture friction factor.

show abstract

“…It has the advantages of high speed, high safety, and low cost and has been successfully applied in many industrial processes, including two-phase flow. By utilizing multiple electrodes installed at the periphery of the target pipeline, the void fraction of gas-liquid two-phase flow can be obtained and bubble length can be calculated with a cross-correlation method [10].…”

Section: Introductionmentioning

confidence: 99%

Reconstructing the Phase Distribution Within an Annular Channel by Electrical Resistance Tomography

Tan

Ren

2015

Heat Transfer Engineering

View full text Add to dashboard Cite

Phase distribution within an annular channel is desired to know in cooling systems. Electrical resistance tomography (ERT)is a promising technique to achieve this task in a noninvasive and visualized manner. However, high nonlinearity and ill condition of ERT restrict its spatial resolution. The internal structure that forms the annular channel with the pipe wall makes the image reconstruction of phase distribution different from the circular cross section that ERT usually applied to. In this paper, a hybrid solver coupling the finite-element method and boundary-element method is proposed to solve the forward problem more efficiently. This algorithm is based on an elaborately designed finite-element forward solution, which speeds up the image reconstruction by eliminating the unknowns inside the known internal structure using boundary element method. The Levenberg-Marquardt (L-M) method is used to achieve a fast convergence and a high numerical accuracy and then to reconstruct the phase distribution within the annular channel. The linear and nonlinear forms of the L-M methods are compared in the cases of changing the internal structure conductivity, in order to understand the influence of the internal structure.

show abstract

Void Fraction Measurement and Signal Analysis from Multiple-Electrode Impedance Sensors

Cited by 50 publications

References 21 publications

Salinity Independent Flow Measurement of Vertical Upward Gas-Liquid Flows in a Small Pipe Using Conductance Method

Salinity Independent Flow Measurement of Vertical Upward Gas-Liquid Flows in a Small Pipe Using Conductance Method

A Differential Pressure Sensor Coupled with Conductance Sensors to Evaluate Pressure Drop Prediction Models of Gas-Water Two-Phase Flow in a Vertical Small Pipe

Reconstructing the Phase Distribution Within an Annular Channel by Electrical Resistance Tomography

Contact Info

Product

Resources

About