Flow Conditioner Toroidal Vortex for Measuring Tube Accuracy
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Solution Overview
Problem
Conventional measuring systems for process lines face challenges in achieving accurate measurement of flow variables like mass flow, density, and viscosity, especially in large caliber lines with slow-flowing media, due to disturbances in the flow profile caused by differences in flow cross-sections between the process line and the measuring tube, leading to reduced measurement accuracy.
Innovation Solution
A measuring system with a flow conditioner that generates a stationary toroidal vortex in the inlet area, using sharp circular inner edges and guide surfaces to create a 'virtual' nozzle effect, which accelerates the flow and stabilizes the profile, reducing disturbances and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measuring tube has a smaller flow cross-section than the process line, then the flow velocity increases and measurement accuracy improves, but flow disturbances occur at the transition area reducing measurement reliability
Solution Approach 1:
The flow conditioner is installed upstream of the measuring tube to preliminarily condition the flow before it enters the measurement area. The flow conditioner includes flow straightening elements and a transition piece that pre-adjust the flow profile, reducing disturbances before they reach the measuring tube and ensuring stable flow conditions for accurate measurement.
Solution Approach 2:
The flow conditioner acts as an intermediary component between the process line and the measuring tube. It mediates the transition by gradually changing the flow cross-section and straightening the flow profile, preventing direct abrupt transitions that would cause harmful flow disturbances and measurement errors.
2Reliability
If a flow conditioner is installed to reduce flow disturbances, then measurement reliability improves, but the device complexity and installation space requirements increase
Solution Approach 1:
The flow conditioner is divided into functional segments: a transition piece for gradual cross-section change and separate flow straightening elements. This segmentation allows each component to perform its specific function efficiently while keeping the overall design manageable and maintainable.
Solution Approach 2:
The transition piece features curved, rounded surfaces instead of sharp edges to guide flow smoothly from the larger process line cross-section to the smaller measuring tube cross-section. These curved surfaces reduce flow separation and turbulence, improving measurement reliability without requiring excessively complex geometries.
3Measurement precision
If the flow cross-section difference between process line and measuring tube is large, then flow acceleration is sufficient for accurate measurement, but flow profile disturbances increase reducing measurement quality
Solution Approach 1:
The flow conditioner preliminarily accelerates and straightens the flow before it enters the measuring tube, ensuring that even with large cross-section differences, the flow profile remains stable and undisturbed in the measurement area, maintaining high measurement quality.
Solution Approach 2:
The flow conditioner mediates the large cross-section transition by providing a gradual, controlled reduction in flow area with flow straightening elements that prevent turbulence and profile distortion, allowing sufficient flow acceleration without harmful disturbances.
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 system effectively transforms the flow into a favorable Reynolds number range, providing accurate and reproducible measurements despite disturbances upstream, and is suitable for both liquid and gaseous media, even with large differences in flow cross-sections between the process line and measuring tube.
Implementation Method 1
A measuring system with a flow conditioner that generates a stationary toroidal vortex in the inlet area
Data Source
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AI summary
The measuring system is inserted into the course of a process line and is used to record at least one measurement variable of a medium flowing in the process line. For this purpose, it comprises a measuring sensor having a measuring tube, which is used to guide medium to be measured, and having a sensor arrangement which has at least one sensor element, which primarily reacts to the measurement variable to be recorded, and uses the at least one sensor element to provide at least one measurement signal which is influenced by the measurement variable. The measuring system also comprises measuring electronics which communicate with the measuring sensor and use the at least one measurement signal to at least occasionally generate at least one measured value which instantaneously represents the measurement variable. In the measuring system according to the invention, the measuring tube has a smaller flow cross section than an intake segment of the process line that is connected to the measuring system on the inlet side. The measuring system therefore also comprises a flow conditioner which is arranged on the inlet side of the measuring tube, mediates between the latter and the intake segment of the process line and has a lumen which tapers towards the measuring tube and through which the medium flows during operation. The flow conditioner has at least two inner edges which are arranged upstream of the outlet end of said flow conditioner, project into the lumen of the flow conditioner