Gel-Based Flow Meter for Low Density Aerodynamic Measurement
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Solution Overview
Problem
Current flow meters for aerodynamics measurements, such as those used in wind tunnel experiments, face limitations in measuring low flow densities and require complex fabrication processes, high-cost MEMS technology, and are often restricted to specific fluid types and temperature ranges, with existing sensors offering limited spatial resolution and stability issues due to water content fluctuations in hydrogel-based materials like pectin gels.
Innovation Solution
A flow meter design incorporating a heater layer, thermally insulated and accessible thermometer layers made of gel or polymer materials, particularly using pectin cross-linked by calcium ions, which generates a thermal gradient to calculate convective heat-transfer coefficients, enabling accurate flow rate measurement with high spatial resolution and flexibility, even at low flow densities and varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hydrogel-based materials like pectin gels are used for temperature sensing, then flexibility and adaptability to curved surfaces are improved, but stability deteriorates due to water content fluctuations
Solution Approach 1:
The patent uses composite materials by combining pectin gel with calcium ions to form a cross-linked structure. This composite approach maintains the flexibility and adaptability of hydrogel-based materials while improving stability through the cross-linked network that reduces water content fluctuations. The calcium ion cross-linking creates a more stable molecular structure that preserves the beneficial properties of pectin gel without its instability drawbacks.
2Measurement precision
If MEMS technology is used for flow measurement, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces complex MEMS (microelectromechanical systems) technology with a simpler thermal convection-based measurement system. Instead of using sophisticated mechanical and electrical components, the invention uses temperature-sensitive gel materials and thermal convection principles to measure flow rate, significantly reducing device complexity and manufacturing costs while maintaining measurement precision.
Solution Approach 2:
The patent changes the measurement approach by using temperature parameter changes in gel materials rather than complex mechanical parameters. By monitoring temperature variations and thermal convection effects in the gel, the system achieves precise flow measurement without requiring complex MEMS structures, thereby simplifying the device while maintaining accuracy.
3Measurement precision
If existing flow meters are used, then they can measure flow rate, but spatial resolution is limited
Solution Approach 1:
The patent applies segmentation by using an array of temperature-sensitive gel elements distributed across the measurement surface. Each gel element acts as an independent temperature sensor, creating multiple measurement points that provide high spatial resolution. This segmented approach allows the system to capture detailed flow distribution patterns across the entire surface, significantly improving spatial resolution compared to conventional single-point or limited-point measurement systems.
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 solution provides accurate and flexible flow rate measurements with high spatial resolution, overcoming limitations of existing sensors by using pectin-based temperature-sensitive materials that maintain stability and responsiveness across a range of temperatures, suitable for diverse fluid environments and curved surfaces.
Implementation Method 1
the at least one heater layer is configured to generate a constant heat flux through the at least one first thermometer layer, the at least one thermal insulator layer, and the at least one second thermometer layer, thus generating a thermal gradient within the at least one thermal insulator
Implementation Method 2
the at least one first thermometer layer is thermally insulated from an environment surrounding the sensor
Implementation Method 3
generating a thermal gradient within the at least one thermal insulator... to calculate convective heat-transfer coefficients
Data Source
AI summary
A sensor includes a heater, a thermal insulator between two thermometer layers, the heater generating a thermal gradient within the thermal insulator. The thermometers give an indirect measurement of fluid flow around the sensor, based on their temperature readings. The thermometers are flexible layers including gels.