Coaxial Compact Static Mixer with Segmented Channels
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Solution Overview
Problem
Existing static mixers face limitations in scaling up media throughput without increasing pressure loss or adding complexity, particularly in mini and micro scales, where precise flow distribution and mixing efficiency are critical.
Innovation Solution
A static mixer design featuring a coaxial arrangement of mixing stages with azimuthally segmented annular channels that undergo radial offset and widening, ensuring balanced mass transfer and reduced pressure drop, allowing for scalable throughput without additional pressure loss elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pipe cross section is decreased to increase mixing fineness, then the mixing precision is improved, but the media throughput is reduced
Solution Approach 1:
The mixer divides the flow into multiple parallel partial channels (segmentation of the flow path) while maintaining a compact overall structure. This allows the mixer to process larger volumes of media through parallel pathways rather than requiring a single large channel, thus increasing throughput while maintaining fine mixing capability through the segmented structure.
Solution Approach 2:
The patent employs a three-dimensional coaxial arrangement of mixing stages with radial and axial components. By utilizing multiple spatial dimensions (radial offset between stages, axial progression), the mixer achieves intensive mixing in a compact volume, allowing fine mixing without requiring large pipe cross-sections, thereby maintaining high throughput capability.
2Productivity
If the number of parallel flow divisions is increased to improve mixing efficiency, then the mixing speed is improved, but the pressure loss increases
Solution Approach 1:
Multiple partial channels are merged back together in each mixing stage to form a single outlet channel. This merging process allows the mixer to benefit from the intensive mixing that occurs in parallel channels while recovering pressure by consolidating the flows, thus reducing overall pressure loss compared to maintaining permanently divided channels.
Solution Approach 2:
The mixer employs periodic alternation between division (splitting into partial channels) and recombination (merging back together) across successive mixing stages. This periodic structure enables intensive mixing during the division phases while allowing pressure recovery during the recombination phases, thus achieving high mixing efficiency without sustained high pressure loss.
3Manufacturing precision
If the mixing section length is increased to improve mixing quality, then the mixing homogeneity is improved, but the device complexity and space requirement increase
Solution Approach 1:
The mixing stages are arranged in a nested coaxial configuration where multiple mixing sections are integrated within each other along the axial direction. Each stage contains radial offset channels that are nested within the overall cylindrical structure, allowing intensive mixing to occur in a compact axial space, thus achieving high mixing homogeneity without excessive length or structural complexity.
Solution Approach 2:
The mixer employs curved radial channels and coaxial cylindrical geometry throughout its structure. These curved pathways guide the fluid through multiple mixing stages in a compact spiral-like progression, achieving intensive mixing in a short axial distance while maintaining structurally simple, manufacturable curved surfaces rather than complex angular transitions.
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 design achieves efficient mixing and heat exchange across a wide flow range with minimal pressure loss and reduced susceptibility to blockages, enabling higher media throughputs while maintaining mixing quality and heat exchange efficiency.
Implementation Method 1
induce turbulent and laminar crossflows (turbulence/advection), which bring about repeated dividing, shearing and/or folding of the flow
Implementation Method 2
induce turbulent and laminar crossflows (turbulence/advection), which bring about repeated dividing, shearing and/or folding of the flow
Implementation Method 3
The intensive crossmixing (rapid fluid exchange between wall and core regions), the compact flow cross section and a large surface-volume ratio of the mixing section mean that static mixers also often offer much more favorable conditions for the heat exchange of the mixture with the mixing walls
Data Source
AI summary
Scalable compact static mixer comprising a rotationally symmetrical cascaded mixing structure.