Indicator Particles for Measuring Fluid State at Inaccessible Points
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Solution Overview
Problem
Existing methods for determining the state variables of a fluid flow, such as velocity, temperature, and pressure, are limited in their ability to measure these variables at inaccessible locations within fluid-carrying devices.
Innovation Solution
The use of indicator particles designed to irreversibly change their properties in response to specific state variables, such as normal or shear stress, through shape deformation or material alteration, allowing for the determination of actual values and ranges at points upstream of the measurement point using optical or imaging techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If indicator particles are used to determine state variables at inaccessible locations, then measurement capability is improved, but device complexity increases due to particle introduction and detection systems
Solution Approach 1:
Indicator particles serve as intermediaries between the fluid flow and the detection system. These particles are introduced into the fluid, carry state variable information through their irreversible property changes, and can be detected downstream without requiring direct access to the measurement location. This mediator approach enables measurement at inaccessible locations while managing system complexity through standardized particle designs.
Solution Approach 2:
The patent replaces complex mechanical sensing systems with indicator particles that passively carry information through their physical or chemical property changes. Instead of installing sophisticated sensors in difficult-to-reach areas, the system uses particles that naturally respond to state variables and can be detected using optical or imaging techniques, substituting mechanical measurement infrastructure with a more flexible particle-based approach.
2Reliability
If irreversible property changes are used for state variable detection, then measurement reliability is improved, but particle distinguishability deteriorates over time
Solution Approach 1:
Particles are pre-marked with identifiable features (such as fluorescent markers, reflective coatings, or unique size distributions) before introduction into the fluid. This preliminary marking ensures that even after irreversible property changes occur in response to state variables, the particles remain distinguishable from one another and from background elements, allowing reliable tracking and detection throughout their journey.
Solution Approach 2:
The indicator particles utilize color changes or optical property changes as their indicator property that responds to state variables. These optical changes are reversible or occur in a controlled manner, allowing the particles to maintain their distinguishability while still providing reliable state variable information. The color or optical signature serves as both the identification marker and the state variable indicator.
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
Enables non-intrusive measurement of fluid state variables at inaccessible points by detecting the irreversible changes in indicator particles, providing accurate insights into fluid behavior within fluid-carrying devices.
Implementation Method 1
the particle shell is designed and configured to irreversibly change the indicator property in the form of its shape and/or to tear when the normal stress deviates from the reference pressure by a specific pressure difference
Implementation Method 2
the particle shell is designed and configured to irreversibly change the indicator property in the form of its shape and/or to tear when the shear stress deviates from a reference stress
Implementation Method 3
the indicator particle is designed and configured for an irreversible change in an indicator property of the indicator particle as a unique function of the actual value after a certain period of time has elapsed following its introduction into the fluid
Implementation Method 4
the base body is covered by a protective covering so that the base body or the sensor material is only exposed to the fluid after the certain period of time following its introduction into the fluid has elapsed
Data Source
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AI summary
The invention relates to a method for determining an actual value and/or an actual value range of at least one state variable of a fluid in a fluid flow by means of at least one indicator particle (9) introduced into the fluid. In addition, it is proposed that the at least one indicator particle (9) is designed and provided for an irreversible property change of an indicator property of the indicator particle (9) in the case of a certain indicator value of the at least one state variable in the fluid flow and/or as a clear function of the actual value when a certain time period has elapsed after the indicator particle (9) has been introduced into the fluid, wherein the indicator particle (9) is detected at a detection point, the indicator property of the indicator particle (9) is evaluated and the actual value and/or the actual value range of the state variable is inferred from the indicator property downstream of the detection point. The invention also relates to a method for operating a fluid-guiding device (7), an indicator particle (9) and a device (7) for determining the actual value and/or actual value range of the at least one state variable.