Ultrasonic Flowmeter Logarithmic Reynolds Correction
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Solution Overview
Problem
Current ultrasonic flow meters face challenges in accurately measuring fluid flow, particularly in capturing the flow velocity and volume of fluids with varying Reynolds numbers, due to limitations in propagation time measurements and correction coefficients.
Innovation Solution
The proposed ultrasonic flow meter employs a dual-transducer system with a logarithmic correction function that performs broken-line approximation of the relationship between the logarithm of the Reynolds number and the correction coefficient, allowing for accurate flow velocity computation and correction, even in laminar and turbulent flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ultrasonic flow meters use standard correction coefficients for flow velocity measurement, then the device structure remains simple, but measurement precision deteriorates when measuring fluids with varying Reynolds numbers
Solution Approach 1:
The patent changes the parameter representation from linear Reynolds number to logarithmic Reynolds number, and applies broken-line approximation to create a piecewise correction function. This transforms the continuous correction coefficient into discrete segments based on logarithmic Reynolds number ranges, improving measurement precision across varying flow conditions while managing complexity through parameter transformation.
2Measurement precision
If the flow meter uses detailed correction functions for different Reynolds numbers, then measurement precision improves, but memory requirements increase
Solution Approach 1:
By transforming the correction function to use logarithmic Reynolds number as the independent variable and applying broken-line approximation, the patent reduces the memory storage requirements. The piecewise linear function in logarithmic space requires fewer storage points than a continuous or high-resolution function in linear space, thus reducing memory requirements while maintaining precision.
3Adaptability or versatility
If the ultrasonic flow meter uses a single correction coefficient for all flow conditions, then device complexity remains low, but adaptability deteriorates when measuring different fluid types and flow regimes
Solution Approach 1:
The patent enhances adaptability by introducing logarithmic Reynolds number as a transformation parameter and using broken-line approximation to create a piecewise correction function. This allows the system to adapt to different fluid types and flow regimes (laminar, transitional, turbulent) by selecting appropriate correction coefficients from different segments of the logarithmic scale, significantly improving measurement range without requiring completely separate systems for each flow regime.
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 solution enables precise measurement of fluid flow by reducing memory requirements and improving accuracy across a wide range of Reynolds numbers, enhancing the flow meter's range-ability and reliability.
Implementation Method 1
a first ultrasonic transducer for making incident a first ultrasonic signal against a pipe through which a fluid flows; a second ultrasonic transducer, disposed in a position capable of receiving the first ultrasonic signal, for making incident a second ultrasonic signal against the pipe
Implementation Method 2
computing the flow velocity of the fluid within the pipe based on a first time period during which the first ultrasonic signal passes through the pipe and arrives at the second ultrasonic transducer and on a second time period during which the second ultrasonic signal passes through the pipe and arrives at the first ultrasonic transducer
Data Source
AI summary
An ultrasonic flow meter that includes a first ultrasonic transducer for making incident a first ultrasonic signal against a pipe through which a fluid flows; a second ultrasonic transducer, disposed in a position capable of receiving the first ultrasonic signal, for making incident a second ultrasonic signal against pipe; a flow velocity computation component for computing the flow velocity of the fluid within pipe based on a first time period during which the first ultrasonic signal arrives at the second ultrasonic transducer and on a second time period during which the second ultrasonic signal arrives at the first ultrasonic transducer; a logarithmic correction function saving component for saving a logarithmic correction function; and a logarithmic correction component for correction the flow velocity by using the correction coefficient that corresponds to the Reynolds number of the fluid.