Perforated Flow Conditioner with Varying Hole Diameters
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional flow straighteners often require long inlet lengths to achieve a fully developed and axially symmetrical flow profile, and can suffer from turbulence due to pipe transitions and internal wall features, which complicates the formation of a stable flow profile.
Innovation Solution
A flow straightener design featuring a perforated plate with a central hole and concentric circular paths of varying hole diameters, where the majority of holes on central paths have larger diameters for rapid mixing, and the holes are arranged to ensure symmetry and optimal flow distribution, reducing micro-turbulence and enhancing the formation of a developed flow profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flow straighteners are used, then flow profile formation is achieved, but long inlet lengths are required and turbulence occurs
Solution Approach 1:
The patent applies local quality by varying the hole diameters in different radial zones of the perforated plate. The central region has larger hole diameters to enhance mixing and disrupt turbulent structures, while outer regions have smaller diameters for flow straightening. This spatial variation in hole size optimizes flow profile formation without requiring long inlet lengths.
Solution Approach 2:
The flow straightener is segmented into multiple concentric circular paths with different hole diameter characteristics. This segmentation allows different regions to perform specialized functions: central paths with larger holes for turbulence control and mixing, outer paths with smaller holes for flow conditioning, thereby achieving effective flow profile formation in a compact design.
2Ease of manufacture
If uniform hole diameters are used throughout the plate, then manufacturing is simplified, but flow mixing and profile development are less effective
Solution Approach 1:
The patent implements local quality by specifying different hole diameters for different radial positions on the perforated plate. The central circular paths have larger hole diameters to promote rapid mixing and flow redistribution, while outer circular paths have smaller diameters for flow straightening. This non-uniform distribution accelerates flow profile development while remaining manufacturable through standardized drilling processes for each zone.
3Productivity
If larger hole diameters are used in central paths, then rapid mixing is achieved, but hole diameter variations increase manufacturing complexity
Solution Approach 1:
The patent applies local quality by creating distinct zones with different hole diameter characteristics. The central region (inner circular paths) features larger hole diameters to generate rapid mixing and disrupt adverse pressure gradients, while outer regions have smaller diameters for flow conditioning. This zoned approach optimizes mixing efficiency while maintaining reasonable manufacturing complexity through systematic hole pattern repetition within each zone.
Solution Approach 2:
The perforated plate is segmented into multiple concentric circular paths, each with characteristic hole diameters. This segmentation into functional zones (central mixing region with larger holes, outer conditioning region with smaller holes) enables the system to achieve rapid mixing where needed while keeping overall device complexity manageable through modular hole pattern design.
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 design achieves a rapid formation of a fully developed and axially symmetrical flow profile with reduced micro-turbulence, allowing for efficient flow optimization and improved performance in flow meters, particularly suitable for laminar, transient, and turbulent flows.
Implementation Method 1
The large hole diameter on one or more central circular paths achieves rapid mixing to the final mass flow distribution in the center of the flow profile
Data Source
Figure 1
AI summary
A flow conditioner comprising a perforated disk that has a central hole and four or more concentric circular paths which are arranged radially in relation to the central hole and on which holes are located, is characterized in that the majority of holes on a central circular path have a greater hole diameter than the majority of holes on the innermost circular path and the majority of holes on the outermost circular path.