scholarly journals Inverse Normalization Method for Cross-Sectional Imaging and Velocimetry of Two-Phase Flows Based on Electrical Capacitance Tomography

2018 ◽  
Vol 2 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Shah Chowdhury ◽  
Qussai M. Marashdeh ◽  
Fernando L. Teixeira
Keyword(s):  
Normalization Method ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Two Phase Flows ◽  
Two Phase ◽  
Cross Sectional ◽  
Cross Sectional Imaging ◽  
Sectional Imaging ◽  
Capacitance Tomography

Visualisation of Two-Phase Gas-Liquid Pipe Flows Using Electrical Capacitance Tomography

Volume 1 ◽  
2004 ◽  
Author(s):  
Andy Hunt ◽  
John Pendleton ◽  
Yves Ladam
Keyword(s):  
Velocity Distribution ◽  
Virtual Instrument ◽  
Gamma Ray ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Flow Loop ◽  
Two Phase ◽  
Cross Sectional ◽  
Measure Concentration ◽  
Capacitance Tomography

Electrical Capacitance Tomography (ECT) has been used over a number of years to measure concentration distribution, and more recently velocity distribution, in two-phase flows. ECT is non-intrusive, and the reconstruction of the concentration and velocity distribution can be undertaken in real time and over an arbitrary number of zones in the flow cross-section. In this paper the concept of a ‘virtual instrument’ is introduced where zones of the image can be structured for comparison with other measurements. Numerical agreement with gamma-ray density measurements is shown to be excellent in slug and stratified flows. We present a series of measurements undertaken in complex oil/gas slug flows in a large flow loop. We present a variety of 2-D cross-sectional images, time series velocity and concentration graphs and 3-D contour plots. The good temporal and spatial resolution of ECT throws an extensive new light on these otherwise difficult to measure dynamic flow structures. In particular with bubbly-slug structures known as ‘ghosts’ ECT shows clearly that they are in fact bubbly waves which have extended ‘wings’ up and around the pipe.

ECT Visualization of Two Phase Flows

Volume 1 ◽  
2004 ◽  
Author(s):  
S. Liu ◽  
H. Wang ◽  
F. Jiang ◽  
R. Yan ◽  
X. Dong ◽  
...  
Keyword(s):  
Image Reconstruction ◽  
New Technology ◽  
Rapid Development ◽  
Data Interpretation ◽  
Electrical Capacitance Tomography ◽  
3D Image ◽  
Electrical Capacitance ◽  
Two Phase Flows ◽  
Two Phase ◽  
Capacitance Tomography

Electrical capacitance tomography (ECT) has been under rapid development in recent years. However, as a relatively new technology, ECT is far from mature and its applications are rather appliance-dependent, i.e. the sensor design, calibration, and data interpretation etc., depend on the understanding of the specific situations for ECT measurement. The authors have experimented several sensing strategies and developed algorithms for 3D image presentation and online iterative image reconstruction, and applied ECT to the measurement of several typical cases of two phase flows, which is reported in this paper.

Visualisation of gas–oil two-phase flows in pressurised pipes using electrical capacitance tomography

2005 ◽  
Vol 16 (2-3) ◽  
pp. 129-134 ◽  
Author(s):  
J.C. Gamio ◽  
J. Castro ◽  
L. Rivera ◽  
J. Alamilla ◽  
F. Garcia-Nocetti ◽  
...  
Keyword(s):  
Electrical Capacitance Tomography ◽  
Gas Oil ◽  
Electrical Capacitance ◽  
Two Phase Flows ◽  
Two Phase ◽  
Capacitance Tomography

Image Fusion of ECT/ERT for Oil-Gas-Water Three-Phase Flow

2011 ◽  
Vol 3 (2) ◽  
pp. 29-34 ◽  
Author(s):  
Lifeng Zhang
Keyword(s):  
Image Fusion ◽  
Electrical Capacitance Tomography ◽  
Phase Flow ◽  
Electrical Capacitance ◽  
Cross Sectional ◽  
Three Phase ◽  
Three Phase Flow ◽  
Capacitance Tomography ◽  
Oil Gas ◽  
Image Fusion Method

The tomographic imaging of process parameters for oil-gas-water three-phase flow can be obtained through different sensing modalities, such as electrical resistance tomography (ERT) and electrical capacitance tomography (ECT), both of which are sensitive to specific properties of the objects to be imaged. However, it is hard to discriminate oil, gas and water phases merely from reconstructed images of ERT or ECT. In this paper, the feasibility of image fusion based on ERT and ECT reconstructed images was investigated for oil-gas-water three-phase flow. Two cases were discussed and pixel-based image fusion method was presented. Simulation results showed that the cross-sectional reconstruction images of oil-gas-water three-phase flow can be obtained using the presented methods.

Electrical Capacitance Tomography Based Sorting Technique for Wasted Plastics

2015 ◽  
Author(s):  
Yusuke Hirose ◽  
Kazuaki Hata ◽  
Sapkota Achyut ◽  
Masahiro Takei
Keyword(s):  
Temperature Distribution ◽  
Relative Permittivity ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Time Step ◽  
Cross Sectional ◽  
Sorting Technique ◽  
The Many ◽  
Capacitance Tomography ◽  
Temperature Equation

This study has launched a concept to measure real time two-dimensional temperature distribution non-invasively by a combination of electrical capacitance tomography (ECT) technique and a permittivity-temperature equation for plastic pellets. The concept has two steps which are the relative permittivity calculation from the measured capacitance among the many electrodes by ECT technique, and the temperature distribution calculation from the relative permittivity distribution by permittivity-temperature equation. ECT sensor with 12-electrode is designed to measure and visualize the cross sectional temperature distribution during polymethyl methacrylate (PMMA) pellets cooling process. The images of the normalized relative permittivity distribution are successfully reconstructed at every time step during the process. The images indicate that the normalized relative permittivity of PMMA pellets is decreased as the temperature is decreased.

scholarly journals Electrical Capacitance Tomography (ECT) Electrode Size Simulation Study for Cultured Cell

2021 ◽  
Vol 2071 (1) ◽  
pp. 012052
Author(s):  
N A Zulkiflli ◽  
M D Shahrulnizahani ◽  
X F Hor ◽  
F A Phang ◽  
M F Rahmat ◽  
...  
Keyword(s):  
Finite Element ◽  
Cultured Cells ◽  
Electrical Capacitance Tomography ◽  
Finite Element Models ◽  
Capacitive Sensing ◽  
Electrical Capacitance ◽  
Cross Sectional ◽  
Electrode Size ◽  
Cell Monitoring ◽  
Capacitance Tomography

Abstract Cell sensing and monitoring using capacitive sensors are widely used in cell monitoring because of the flexible and uncomplicated design and fabrication. Previous work from many different fields of applications has integrated capacitive sensing technique with tomography to produce cross-sectional images of the internal dielectric distribution. This paper carried an investigation on the capabilities of four 16-channel sensor electrodes with different electrode sizes to detect the change in the dielectric distribution of the cultured cells. All three 16-channel sensor electrodes are designed and simulate on COMSOL 6.3a Multiphysics. The pre-processing results obtained from three finite element models (FEM) of ECT sensor configurations in detecting the cell phantom shows that bigger electrodes size are more sensitive to permittivity distribution.

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