Microreactor Mixer Elements with Pillar Obstacles for Pressure Drop
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Solution Overview
Problem
Existing micro reactor systems face challenges in achieving efficient mixing at low pressure drop, particularly in small-scale, multiphase fluidic applications, where typical designs require significant precision, are costly, and often ineffective for gas-liquid systems, leading to increased pressure drop and reduced mixing efficiency.
Innovation Solution
A mixer design with an injection zone and series of mixer elements featuring chambers with obstacles, such as pillars, to reduce inner dimensions and create tortuous flow paths, enhancing mixing efficiency while minimizing pressure drop, suitable for miscible and immiscible liquids, gases, and solids, with adjustable dimensions and geometries to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mixing methods are used in micro-reactor systems, then mixing efficiency is improved, but pressure drop increases significantly
Solution Approach 1:
The invention transitions from two-dimensional channel mixing to three-dimensional flow patterns by introducing vertical obstacles (pillars) that extend into the channel height. This creates complex 3D flow paths including upward and downward flow regions, enhancing mixing efficiency without proportionally increasing pressure drop through the optimized spatial arrangement of obstacles
Solution Approach 2:
The invention optimizes multiple geometric parameters including obstacle height (extending 20-80% into the channel), channel width, channel height, and obstacle spacing to achieve the desired balance between mixing efficiency and pressure drop. The systematic variation of these parameters allows tuning of flow patterns while controlling pressure losses
2Reliability
If mixer dimensions are reduced to improve mixing efficiency, then mixing performance increases, but manufacturing precision requirements increase
Solution Approach 1:
The mixer is divided into multiple identical repeating elements, each containing channels with obstacles. This modular segmentation allows for standardized manufacturing of individual elements that can be replicated, reducing the cumulative precision requirements compared to designing a completely unique complex structure
Solution Approach 2:
By utilizing the vertical dimension with obstacles extending into the channel height, the invention achieves enhanced mixing without reducing the horizontal channel dimensions. This maintains larger, more easily manufactured channel widths and heights while still achieving efficient mixing through the third dimension
3Reliability
If complex mixer structures are used to enhance mixing, then mixing efficiency improves, but device complexity increases
Solution Approach 1:
The complex mixing function is achieved through simple repeating units rather than a single complex structure. Each unit contains basic channels with obstacles, and the overall mixing performance emerges from the series arrangement of these identical simple elements, reducing design and manufacturing complexity
Solution Approach 2:
The invention creates dynamic flow patterns including upward flow, downward flow, and recirculation zones through the simple presence of obstacles in the channels. These dynamic flow features enhance mixing efficiency without requiring complex mechanical moving parts or sophisticated structural designs
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 efficient mixing with reduced pressure drop and increased mixing efficiency by creating localized flow turbulence and reducing diffusion lengths, suitable for a wide range of fluid systems, including those with solids, while maintaining robustness and flexibility in design.
Implementation Method 1
Each one of the mixer elements includes a channel segment, a chamber disposed at ends of the channel segment and each chamber further includes at least one obstacle... designed with a chamber at the end in which an obstacle such as a pillar is placed to reduce the typical inner dimension and an optional restriction in the channel segment
Implementation Method 2
The design achieves efficient mixing with reduced pressure drop and increased mixing efficiency by creating localized flow turbulence and reducing diffusion lengths
Implementation Method 3
In micro-fluidic systems, typical dimensions are below 1 mm and make the mixing and/or the agitation a first order issue... reaction processes are largely diffusion limited... reducing diffusion lengths
Data Source
AI summary
A class of designs is provided for a mixer in micro reactors where the design principle includes at least one injection zone in a continuous flow path where at least two fluids achieve initial upstream contact and an effective mixing zone (i.e. adequate flow of fluids and optimal pressure drop) containing a series of mixer elements in the path. Each mixer element is preferably designed with a chamber at each end in which an obstacle is placed (thereby reducing the typical inner dimension of the chamber) and with optional restrictions in the channel segments. The obstacles are preferably cylindrical pillars but can have any geometry within a range of dimensions and may be in series or parallel along the flow path to provide the desired flow-rate, mixing and pressure-drop. The injection zone may have two or more interfaces and may include one or more cores to control fluids before mixing.