Flowmeter Mount With Turbulence Conditioning for Low-Flow Accuracy
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Solution Overview
Problem
Existing flow measurement devices, particularly clamp-on flow measuring devices, suffer from inaccuracies at low flow velocities and volumes due to laminar flow profiles, which affect the precision of measurement variables.
Innovation Solution
A device with a flow-influencing element integrated into the flow path, designed to transition fluid flow from laminar to turbulent, ensuring a turbulent flow profile in the measurement region, thereby improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If clamp-on flow measuring devices are used without flow-influencing elements, then the device structure remains simple and easy to install, but measurement accuracy deteriorates at low flow velocities due to laminar flow profiles
Solution Approach 1:
The flow-influencing element is installed upstream of the measurement region to preliminarily modify the flow profile before measurement. This preliminary action ensures that by the time fluid reaches the measurement region, it has a turbulent flow profile with more uniform velocity distribution, thereby improving measurement accuracy without complicating the measurement mechanism itself.
Solution Approach 2:
The flow-influencing element acts as an intermediary component between the fluid source and the measurement region. It mediates the flow characteristics by creating turbulence and uniformizing velocity distribution, allowing accurate measurements without requiring complex measurement device modifications.
2Length of moving object
If the measurement region is placed close to the inlet connection, then the device length is reduced, but measurement accuracy deteriorates due to non-uniform flow profile development
Solution Approach 1:
The flow-influencing element performs preliminary flow conditioning at a specific distance upstream from the measurement region. This allows the measurement region to be positioned relatively close to the inlet while still achieving turbulent flow conditions with uniform velocity distribution, thus maintaining both compact device length and measurement accuracy.
Solution Approach 2:
The flow-influencing element changes the flow parameters (velocity distribution, turbulence intensity) at a controlled distance upstream. This parameter modification enables accurate measurements at shorter device lengths by ensuring that the flow reaches the desired turbulent state before entering the measurement region.
3Adaptability or versatility
If flow-influencing elements are added to create turbulent flow, then measurement accuracy improves across a wider bandwidth of flow velocities, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The flow-influencing element is designed to change flow parameters (create turbulence) across a wide range of flow velocities and viscosities. By optimizing the geometry and positioning of the flow-influencing element, the device achieves adaptability to various flow conditions without requiring multiple different components, thus improving versatility while managing manufacturing complexity.
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 device enhances measurement accuracy by maintaining a turbulent flow profile across a wide range of flow velocities and viscosities, reducing signal noise and improving linearity in flow measurements.
Implementation Method 1
the flow-influencing element is designed such that the fluid flowing into the device via the first connection, said fluid flowing into the device with a substantially laminar flow, has a substantially turbulent flow in the measurement region
Data Source
AI summary
A device for arranging on a fluid-conducting line and for attaching a flowmeter, in particular an ultrasonic flowmeter, for detecting a measurement variable of the fluid conducted by the line has a first and a second connection, and a measurement region arranged between the first connection and the second connection. The first connection, the measurement region, and the second connection define a flow path for the fluid through the device, and a flow-influencing element arranged in and/or on the flow path is configured to cause fluid flowing into the device via the first connection with a substantially laminar flow to have a substantially turbulent flow in the measurement region.