Textured Sensor Head for Repeatable Insertion Magnetic Meters
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Insertion flow meters suffer from poor repeatability and linearity due to their design, which limits their accuracy compared to in-line meters, as they can only measure a point on the velocity profile, leading to inaccuracies in fluid flow measurement.
Innovation Solution
A magnetic insertion meter with a textured front surface, featuring abrasives or dimples, is used to alter the fluid boundary layer and stabilize the separation point, improving measurement consistency and accuracy by manipulating the fluid flow over the sensor head tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If insertion meters are used instead of in-line meters, then installation complexity is reduced and system shutdown is avoided, but measurement accuracy deteriorates due to poor repeatability and linearity
Solution Approach 1:
The patent applies local quality by texturing only the front surface of the sensor head tube while leaving the rest of the tube smooth. This localized texturing modifies the boundary layer specifically at the measurement point to improve repeatability and linearity, without affecting other parts of the meter. The textured surface creates consistent flow patterns at the critical measurement location while maintaining the modular insertion design.
Solution Approach 2:
The patent changes the surface roughness parameter of the sensor head tube by adding texture in the form of dimples, grooves, or abrasive coatings. This parameter change modifies the boundary layer characteristics and flow separation behavior, thereby improving the repeatability and linearity of measurements while preserving the insertion meter's ease of installation.
2Device complexity
If insertion meters measure only a point on the velocity profile, then device complexity is reduced, but measurement precision deteriorates due to inability to directly measure average velocity
Solution Approach 1:
The patent positions the textured surface specifically at the front of the sensor head tube where the measurement point is located. This localized modification creates a more representative flow condition at the single measurement point, allowing it to better reflect the average velocity profile without requiring multiple measurement points or complex sensor arrays.
Solution Approach 2:
The patent replaces the need for multiple measurement points (mechanical complexity) with a single optimized measurement point featuring textured surface modification. The texturing compensates for the limitation of single-point measurement by creating more consistent and representative flow conditions, thereby achieving better accuracy without increasing device complexity.
3Adaptability or versatility
If the velocity profile shape changes with flow, pressure, and temperature, then adaptability to various operating conditions is improved, but repeatability deteriorates because the relationship between point measurement and average velocity becomes unpredictable
Solution Approach 1:
The patent modifies the boundary layer parameters through surface texturing, which stabilizes the flow separation point and creates more consistent flow patterns. This parameter change makes the relationship between point velocity and average velocity more predictable across varying flow, pressure, and temperature conditions, thereby improving repeatability while maintaining adaptability.
Solution Approach 2:
The textured surface is applied in advance to the sensor head tube to pre-condition the flow before it reaches the measurement point. This preliminary action of texturing the surface creates a more stable and predictable boundary layer that compensates for variations in operating conditions, ensuring consistent measurement relationships across different flow, pressure, and temperature scenarios.
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
The textured surface enhances the repeatability and linearity of the insertion meter, achieving an accuracy of +/-3% or better, simplifying calibration and improving performance across various operating conditions and fluid types.
Implementation Method 1
a textured front surface is adapted to alter the boundary layer of a fluid flowing over the sensor head tube
Implementation Method 2
a textured front surface is adapted to move the separation point of a fluid flowing over the sensor head tube
Implementation Method 3
a field coil configured to emit an alternating magnetic field when energized with an alternating current
Data Source
AI summary
A magnetic insertion meter is disclosed herein. Disclosed insertion meters include in some examples, a sensor head tube cylinder having a textured front surface and at least two electrodes. Disclosed insertion meters include a textured front surface adapted to move the separation point of a fluid flowing over the sensor head tube towards the upstream surface as compared to the same sensor head tube without the textured front surface. Methods of measuring flow are also disclosed herein using example magnetic insertion meters.