Electrical Capacitance Tomography Multiphase Flow Surface Area Estimation
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Solution Overview
Problem
Existing methods struggle to accurately monitor and control the surface areas between phases and between phases and the tube wall in multiphase flows, which are crucial for understanding heat transfer and pressure drop, as these characteristics are difficult to directly measure.
Innovation Solution
A method using electrical capacitance tomography (ECT) to analyze tomogram data and calculate hypothetical surface areas between materials and between materials and the tube wall, allowing for estimation of interfacial areas and other parameters like heat transfer characteristics and pressure drops, enabling control of the flow to prevent catastrophic failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical capacitance tomography is used to monitor multiphase flow, then liquid fraction can be calculated, but other important characteristics like surface areas of interfaces cannot be directly measured
Solution Approach 1:
The patent creates a hypothetical surface that copies the actual interface between phases and between phase and wall. By constructing this virtual surface from tomogram data points, the system can estimate surface areas without directly measuring them, thus resolving the measurement difficulty while maintaining accuracy
Solution Approach 2:
The patent introduces hypothetical surface area as an intermediary parameter that bridges the gap between easily measurable tomogram data and the difficult-to-measure actual surface areas. This intermediary allows indirect estimation of surface areas through calculations based on the hypothetical surface constructed from available data
2Reliability
If surface areas are directly monitored, then accurate heat transfer and pressure drop data can be obtained, but the monitoring process becomes extremely difficult or impossible
Solution Approach 1:
The patent replaces complex physical measurement systems with a computational approach. Instead of using complex hardware to directly measure surface areas, the system uses electrical capacitance tomography combined with mathematical algorithms to calculate hypothetical surface areas, significantly reducing device complexity while maintaining reliability
Solution Approach 2:
The patent changes the measurement parameter from direct surface area measurement to hypothetical surface area calculation. By transforming the problem from measuring a difficult physical quantity to calculating a derived parameter from easier-to-obtain data, the system achieves reliable monitoring without complex devices
3Productivity
If hypothetical physical characteristics are calculated from tomogram data, then surface areas can be estimated quickly and reliably, but the characteristics do not truly exist physically
Solution Approach 1:
The hypothetical surface serves as a computational copy of the actual physical interface. While it doesn't physically exist, it accurately represents the geometric properties of the real interface, allowing quick calculations that maintain physical meaningfulness and accuracy for engineering applications
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a reliable and quick estimation of surface areas and other parameters, enabling effective control of multiphase flows, improving heat transfer performance and preventing pressure drops and oscillations.
Implementation Method 1
capacitance of the material in the sensor volume is measured, and a tomogram is produced
Implementation Method 2
electrical capacitance tomography, which produces a two-dimensional tomogram representing the permittivity of the material being sensed
Data Source
AI summary
An estimate of interfacial areas between the liquid and gas, liquid and wall, and gas and wall in two phase flow is determined using a standard 2D sensor in a fashion to infer 3D information about the liquid/vapor profile when the sensor length is much longer than the diameter. Cross-sectional flow areas for the gas and liquid are also estimated as a function of the axial dimension of the sensor, and the centroid of the mass in the sensor element can also be estimated. An electric capacitance tomography (ECT) system creates tomograms of the flow inside a sensor, and estimates of 3D physical area information are produced from the tomograms.