Segmented Mixer Duct Vortex Generation for Short Mixing Lengths
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Solution Overview
Problem
Existing static mixers often fail to provide sufficient mixing performance under conditions of short available mixing length or limited pressure head, which can lead to inadequate homogenization of reactive additives, posing safety and quality issues.
Innovation Solution
A mixer duct design featuring segments inclined relative to the duct axis with leading edges perpendicular to the fluid flow, generating large-scale vortices for enhanced mixing, and optional features like side inlets, deflection shields, splash plates, and additive injection tubes to ensure efficient homogenization of additives within the fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional static mixers are used, then mixing performance is adequate provided enough mixing length and pressure head are available, but mixing performance becomes insufficient under stringent conditions of short available length or limited pressure head
Solution Approach 1:
The mixer duct is divided into multiple segments (at least two segments) arranged in series, where each segment contains mixing elements that create vortices. This segmentation allows the mixing function to be distributed across multiple smaller units rather than requiring one long mixing section, enabling effective mixing in shorter distances.
Solution Approach 2:
The mixing elements are oriented at angles relative to the duct axis rather than being parallel to the flow direction. This angular orientation creates three-dimensional vortex flows that enhance mixing efficiency within a compact length, utilizing spatial arrangement to amplify mixing performance without increasing axial length.
2Productivity
If conventional static mixers are used, then mixing is effective with sufficient pressure head, but mixing performance becomes inadequate when pressure head is limited
Solution Approach 1:
The mixing process is divided into multiple stages across sequential segments, where each segment contributes to the overall mixing. This distribution reduces the pressure requirement for each individual mixing stage while achieving comprehensive mixing performance, eliminating the need for high pressure head to drive effective mixing.
Solution Approach 2:
The alternating arrangement of mixing elements creates periodic vortex generation throughout the duct. This periodic creation of rotational flow patterns ensures continuous mixing action that does not rely on high pressure differentials, maintaining effective mixing under limited pressure head conditions through repeated cycles of flow manipulation.
3Manufacturing precision
If additive is added to fluid, then homogenization is required for proper reaction stoichiometry, but rapid homogenization is critical for reactive additives to avoid safety or quality issues
Solution Approach 1:
The mixing elements are positioned to create intense vortex flows immediately upon fluid entry into the mixing section. This preliminary generation of turbulent mixing action ensures that additives are rapidly dispersed and homogenized from the moment of injection, preventing safety issues with reactive additives before they can cause quality problems.
Solution Approach 2:
The angular orientation of mixing elements and the geometry of the duct are designed to maximize vortex intensity and turbulence levels. By optimizing these physical parameters, the system achieves rapid homogenization of additives through enhanced turbulent diffusion, reducing homogenization time while maintaining precise concentration distribution for reactive substances.
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 effective mixing and homogenization of additives even under stringent conditions, ensuring proper reaction stoichiometry before fluid enters a subsequent reactor, while being more compact and efficient in material usage.
Implementation Method 1
Each segment produces a vortex. The effect of the substantially perpendicular leading free edge of the segment is that the fluid is subsequently deflected by the segment leading to an increased under-pressure along the downstream side of the segment and an increased over-pressure along the upstream side of the segment and contributing to the development of large-scale vortexes in the fluid.
Implementation Method 2
Static mixers are of interest for all industries concerned with mixing and dispersing, gas liquid contacting, or turbulent mixing applications.
Data Source
Figure 1(a)~1(b)
Figure 2~3
Figure 4(a)~4(b)
AI summary
A mixing duct (1) for mixing of a turbulent flow having an inlet (10) and an outlet (15), containing at least one static mixer element (50) which comprises at least two at least substantially coplanar plate-like segments (70) and (70'), wherein a substantially longitudinal gap (80) is formed between the segments (70) and (70'), wherein each segment (70) and (70') is attached to the duct wall (5) and comprises at least two free edges (72) and (72'), wherein one free edge (72) is the leading edge (74) and the other free edge (72') is adjacent to the longitudinal gap (80), and wherein the at least two segments (70) and (70') are inclined relative to the duct axis (2) so that the leading edge (74) is oriented up-stream in the duct (1) and substantially perpendicular to the direction of a main fluid flow (30).