Sensor Tube Flow-Modifying Element Reduces Vortex Shedding
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Solution Overview
Problem
Existing sensor tubes in fluid processing systems experience flow-induced vibrations due to coherent vortex shedding, leading to mechanical stress, reduced service life, and signal noise, which are not effectively addressed by increasing the strength of the tubes.
Innovation Solution
A sensor tube with a flow-modifying element shaped to reduce coherent vortex shedding by altering the boundary layer flow and controlling vortex detachment, disrupting periodic shedding and modifying the energy and frequency spectra of vortices in the wake field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the strength of the sensor tube is increased to reduce flow-induced vibrations, then the tube can withstand mechanical stress better, but the device size and weight increase, cost increases, and sensitivity decreases
Solution Approach 1:
The invention converts the harmful coherent vortex shedding into incoherent vortex shedding by introducing a flow-modifying element. This element disrupts the periodic vortex formation that causes strong vibrations, transforming the harmful periodic flow pattern into a beneficial random flow pattern that exerts less mechanical stress on the tube, allowing thinner walls and smaller device size
Solution Approach 2:
A flow-modifying element is introduced as an intermediary component between the process flow and the sensor tube. This element acts as a mediator that alters the flow characteristics upstream of the tube, reducing the coherent vortex shedding before it can interact with the tube structure, thereby protecting the tube without requiring increased tube strength or thickness
2Duration of action of stationary object
If the sensor tube is made stronger to withstand vibrations, then service life improves, but response time increases and sensitivity decreases
Solution Approach 1:
By converting coherent vortex shedding into incoherent vortex shedding, the invention reduces the amplitude and duration of vibrational forces acting on the tube. This allows the use of thinner-walled tubes that have faster thermal and mechanical response times while still achieving adequate service life through reduced vibration-induced fatigue and stress
3Ease of manufacture
If traditional sensor tube designs are used, then manufacturing is simple, but flow-induced vibrations cause mechanical stress and reduce service life
Solution Approach 1:
The flow-modifying element serves as an intermediary that can be integrated into existing sensor tube designs. It may be manufactured as a separate component attached to the tube or as an integrated feature of the tube itself, maintaining manufacturing simplicity while dramatically improving reliability by reducing flow-induced vibrations and mechanical stress
Solution Approach 2:
The flow-modifying element can be implemented as a series of discrete features (such as multiple ridges, grooves, or protrusions) distributed along the tube surface. This segmented approach allows the element to effectively disrupt vortex formation while maintaining ease of manufacture through standard machining or molding processes
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 approach reduces flow-induced vibrations, increasing the service life and reliability of sensor tubes, while also improving signal quality and allowing for more flexible design without increasing weight or size, and reducing costs.
Implementation Method 1
Flow-induced vibrations typically arise as a result of vortex shedding and other turbulent wake field effects, which generate periodically alternating forces on the sensor tube
Implementation Method 2
the flow-modifying element is shaped to reduce coherent vortex shedding by altering the boundary layer flow and controlling vortex detachment
Implementation Method 3
These forces cause the tube to oscillate back and forth or vibrate, increasing mechanical stress and reducing service life for both the sensor tube and its associated sensor
Data Source
AI summary
A device comprises a sensor tube for placement in a process flow and a flow-modifying element. The flow-modifying element is formed on the sensor tube, in order to reduce flow-induced vibrations by reducing coherent vortex shedding in the process flow.