Multi-layered Micro-channel Mixer for Efficient Fluid Mixing
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Solution Overview
Problem
Current micro-channel mixers face challenges in achieving efficient mixing of fluids with a wide range of operating conditions, high mass transfer coefficients, low energy consumption, and minimal pressure drop, especially for miscible and immiscible fluids, due to limitations in design and manufacturing complexity.
Innovation Solution
A multi-layered micro-channel mixer with a specific geometrical configuration, including inlet fluid reservoirs, distribution channels, an impinging stream mixing chamber, and baffles, which distributes fluid flow into multiple branching streams, induces vortex and secondary flows to enhance mixing, and reduces pressure drop through optimized angles and channel dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If passive micro-channel mixer with complex geometrical configuration is used to enhance mixing efficiency, then mixing efficiency is improved, but device complexity increases
Solution Approach 1:
The mixer channels are segmented into multiple layers with distinct functions (inlet layer, mixing layer, outlet layer), where each layer contains specific structural elements (distribution channels, mixing channels, baffles). This segmentation allows complex mixing functions to be achieved through modular layer arrangements rather than overly complex single-structure designs, resolving the contradiction between mixing efficiency and device complexity.
Solution Approach 2:
The invention transitions from traditional two-dimensional planar mixers to three-dimensional multi-layered structures. By stacking multiple functional layers vertically and utilizing z-directional fluid flow paths, the mixer achieves enhanced mixing efficiency through increased contact area and flow path length without proportionally increasing planar footprint or structural complexity.
2Productivity
If active micro-channel mixer with external force is used to intensify mixing, then mixing efficiency is improved, but use of energy increases
Solution Approach 1:
The mixer utilizes the kinetic energy and flow characteristics of the fluids themselves to generate mixing effects. Through carefully designed channel geometries, bifurcations, and baffles, the system converts fluid flow energy into chaotic advection and secondary flows, achieving intense mixing without external power input. The structure serves itself by using the working fluid's own energy for the mixing process.
Solution Approach 2:
The invention replaces active mechanical mixing systems (agitation devices, pumps with mixing elements) with passive geometrical structures. The mixing function is achieved through carefully designed channel shapes, bifurcations, and baffles that generate chaotic flow patterns and enhance mass transfer through molecular diffusion and advection, eliminating the need for external mechanical energy input.
3Productivity
If multi-stage fluid distribution channel network is used to distribute flow, then mixing efficiency is improved, but device complexity increases
Solution Approach 1:
The fluid distribution function is segmented across multiple stages, where each stage contains bifurcations that split flow into additional channels. This staged segmentation allows systematic flow distribution throughout the mixer structure, achieving uniform flow allocation without requiring an overly complex single-stage distribution network.
Solution Approach 2:
The multi-stage distribution channel network employs a nested hierarchical structure where smaller channels are embedded within larger channel systems. Each bifurcation stage nests within the previous stage's channel framework, creating a compact, space-efficient distribution network that achieves comprehensive flow coverage without excessive structural complexity.
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 rapid and highly-efficient mixing across a wide range of flow rates with low energy consumption and minimal pressure drop, improving mass transfer coefficients and mixing efficiency compared to existing technologies.
Implementation Method 1
Since the Reynolds number of the fluid flow in the micro-channel is small, it generally falls into laminar flow regime. Hence, the mixing of reactants in the micro-channel is mainly realized by molecular diffusion.
Implementation Method 2
inducing vortex and secondary flows to enhance mixing
Implementation Method 3
generate flow disturbances, secondary eddies and chaotic convection to improve the degree of mixing and mixing efficiency
Data Source
AI summary
A multi-layered micro-channel mixer includes a base plate and a cover plate. Two inlet fluid reservoirs, two inlet channels, two groups of fluid distribution channel networks, two groups of process fluid channels, an impinging stream mixing chamber, a fluid mixing intensification channel and an outlet buffer reservoir are provided on the base plate. Two fluids are fed into the two inlet fluid reservoirs, respectively. The fluids then flow into the process fluid channels via the inlet channels and the multi-stage fluid distribution channel networks, respectively. Then the two fluid streams ejected from the opposing process fluid channels impinges upon each other in the impinging stream mixing chamber. The mixed fluid is subjected to vortex or secondary flow generated by the baffles or the internals in the impinging stream mixing chamber and fluid mixing intensification channel, and finally the mixed fluid is discharged through the outlet buffer reservoir.