Planar Micro-channel Reactor Mixing Design
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Solution Overview
Problem
Micro-channel reactors face challenges with channel clogging due to deposition of reaction products during particle synthesis, leading to reduced mixing efficiency and stability, especially when dealing with solid reaction products like nanoparticles.
Innovation Solution
A novel micro-channel reactor design featuring a planar structure with introduction channels, a stem channel, and branch channels that diverge and join in specific angles and directions to minimize stagnation and clogging, allowing for continuous channel depth changes and uniform fluid flow, preventing abrupt channel changes that cause deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional stacked type micro-channel reactor is used, then mixing efficiency is improved through laminar flow alternation, but channel clogging occurs due to deposition of reaction products
Solution Approach 1:
The channel is divided into multiple segments including introduction channels, a mixing channel with multiple joining parts, and discharge channels. This segmentation allows fluids to be mixed through repeated divergence and joining while maintaining continuous flow paths that prevent stagnation and deposition at any single location.
Solution Approach 2:
The reactor transitions from vertical stacking to horizontal planar configuration. The upper and lower plates are arranged horizontally with channels extending in the horizontal direction, allowing fluids to diverge and join in alternating directions (upward/downward, then leftward/rightward) within the same plane, eliminating abrupt channel changes.
2Speed
If micro-channel structure is used, then mixing speed is increased through reduced diffusion distance, but channel clogging occurs due to micro structure vulnerability
Solution Approach 1:
The channel configuration dynamically changes direction rather than maintaining fixed vertical segments. Fluids flow horizontally, then diverge upward/downward, join again, and diverge leftward/rightward. This dynamic directional change prevents stagnation while maintaining the benefits of micro-channel mixing speed.
3Productivity
If abrupt channel changes are present, then mixing efficiency is improved through channel divergence and joining, but deposition occurs at channel stagnation points
Solution Approach 1:
Instead of having channels abruptly appear and disappear in the vertical direction, the design inverts the approach by having channels continuously change direction in the horizontal plane. The upper and lower plates flow horizontally and join alternately, eliminating stagnation points where deposition would occur.
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 enhances mixing efficiency and stability by minimizing fluid stagnation and clogging, resulting in higher yields of nanoparticles without reactor clogging, improving the synthesis process for particle formation reactions.
Implementation Method 1
The fluids supplied into the respective channels join each other in a state of laminar flow at a channel intersection part
Implementation Method 2
the distance by which the fluids are diffused is reduced. As a result, the speed by which the fluids are mixed is increased
Data Source
AI summary
Disclosed herein is a micro-channel reactor formed by placing a planar upper plate and a planar lower plate, each having a channel formed therein, such that the upper plate and the lower plate face each other, wherein the channel includes one or more introduction channels, into which different fluids are introduced respectively, a mixing channel, along which the fluids introduced into the introduction channels flow in a state in which the fluids join each other, and a discharge channel, from which the fluids joining in the mixing channel are discharged, the mixing channel includes a stem channel extending from the introduction channels to the discharge channel and one or more branch channels that diverge from the stem channel and are then interrupted, and, when the fluids are mixed through repetitive diverging and joining, the fluids diverge in upward and downward directions and then join each other in leftward and rightward directions.