Double Wall Flow Shifter Baffles for Static Mixer Streaking
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Solution Overview
Problem
Static mixers face the challenge of streaking phenomenon, where unmixed fluid streaks form along the interior surfaces, leading to inefficiencies and increased backpressure due to the use of flow inversion baffles, which disrupt mixing layers and require longer mixer lengths to achieve desired mixing effects.
Innovation Solution
The introduction of a flow shifter baffle with a double divider wall element and occluding walls that divides the fluid flow into central and peripheral portions, shifting the peripheral portions to the outer periphery while maintaining the orientation of the central flow, effectively doubling the number of flow layers without significant disruption or backpressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flow inversion baffles are used to address the streaking phenomenon, then mixing effectiveness is improved, but backpressure increases and mixing layers are disrupted
Solution Approach 1:
The baffle is segmented into a double divider wall configuration with multiple occluding walls that create distinct flow paths. This segmentation divides the fluid stream into multiple layers that are redistributed without requiring complex flow inversion, thereby reducing backpressure while maintaining mixing effectiveness.
Solution Approach 2:
Instead of using flow inversion baffles that reverse flow direction and disrupt mixing layers, the invention uses a double divider wall baffle that redirects flow in a more gradual manner. This inverted approach maintains layer integrity while still addressing streaking by redistributing flow patterns.
2Reliability
If flow inversion baffles are used to address the streaking phenomenon, then mixing effectiveness is improved, but mixer length increases
Solution Approach 1:
The double divider wall creates multiple flow channels and layers within a compact baffle structure. This segmentation allows the mixer to achieve thorough mixing in a shorter length by creating more mixing interfaces per unit length compared to traditional single-baffle designs.
Solution Approach 2:
The double divider wall configuration adds dimensional complexity to the flow pattern by creating three-dimensional flow redistribution. This multi-dimensional flow manipulation enhances mixing efficiency within a compact mixer length, eliminating the need for longer mixer configurations.
3Length of moving object
If traditional mixing baffles are used, then mixer length is reduced, but streaking phenomenon occurs
Solution Approach 1:
The double divider wall segments the flow into multiple distinct layers with occluding walls positioned to prevent streak formation. This segmentation ensures that fluid streams are thoroughly intermixed without allowing unmixed streaks to persist, even in a compact mixer length.
Solution Approach 2:
The occluding walls are strategically positioned at specific locations where streaking is most likely to occur. This local quality enhancement targets the problematic areas without requiring a complete redesign of the entire mixer, maintaining compact length while eliminating streaking.
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 enhances mixing performance by minimizing streaks of unmixed fluid and reducing backpressure, allowing for more efficient mixing with fewer elements and shorter mixer lengths, while maintaining the orientation of flow layers for further mixing.
Implementation Method 1
The double divider wall element extends across the entire transverse flow cross-section and is configured to divide the fluid flow into a central flow portion and first and second peripheral flow portions
Implementation Method 2
The plurality of occluding walls are coupled to the double divider wall element and are positioned to force movement of the first and second peripheral flow portions
Implementation Method 3
The flow shifter baffle improves the mixing of separate components by producing a greater number of layers with less disruption of the layers
Data Source
AI summary
A flow shifter baffle for mixing a fluid flow having at least two components, a static mixer, and method of mixing are described. The flow shifter baffle includes a double divider wall element adjacent to a leading edge and a plurality of occluding walls coupled to the double divider wall element. The double divider wall element includes first and second generally parallel walls which extend across the entire transverse flow cross-section. The double divider wall element is configured to divide the fluid flow into a central flow portion and first and second peripheral flow portions. This division of the fluid flow using the double divider wall element and the plurality of occluding walls improves the mixing of separate components by producing a greater number of layers with less jumbling of the layers, when a layered composition of multiple components is delivered into the flow shifter baffle.