Flow Reactor Thermal Cross-Talk Mitigation
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Solution Overview
Problem
Continuous flow micro-/milli-reactors face thermal cross-talk issues due to high thermal conductivity materials, leading to nonhomogeneous products and unwanted side reactions, as heat from hot spots is diffused to other areas within the reactor, potentially causing hazardous conditions.
Innovation Solution
The design incorporates open thermal fluid channels on the surface of reactor plates, which reduce thermal conductivity between process fluid passage segments and allow thermal fluid to carry away heat, minimizing thermal cross-talk by positioning these channels between adjacent process fluid segments and using materials with high thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high thermal conductivity materials (such as silicon carbide) are used for the reactor plates, then heat transfer efficiency is improved, but thermal cross-talk occurs between adjacent process fluid passage segments
Solution Approach 1:
The plate surface is segmented into distinct regions: process fluid passage segments and open thermal fluid channels. This segmentation allows the thermal fluid channels to act as isolated heat dissipation zones between process segments, preventing thermal cross-talk while maintaining overall heat transfer efficiency through the high thermal conductivity material.
Solution Approach 2:
Different regions of the plate are given different local qualities: process fluid passage segments are designed for chemical reaction with controlled thermal exposure, while open thermal fluid channels are designed for active heat dissipation. This local differentiation allows adjacent segments to be thermally isolated despite the high thermal conductivity of the base material.
2Productivity
If process fluid passage segments are positioned adjacent to each other to maximize passage length and volume, then reactor capacity is improved, but thermal cross-talk between segments increases
Solution Approach 1:
Open thermal fluid channels are introduced as intermediary elements between adjacent process fluid passage segments. These channels serve as thermal mediators that actively remove heat from the regions between process segments, preventing thermal cross-talk while allowing the process segments to be positioned adjacently for maximum reactor capacity.
3Object-affected harmful factors
If open thermal fluid channels are positioned between adjacent process fluid passage segments, then thermal cross-talk is reduced, but device complexity increases
Solution Approach 1:
The thermal fluid channels are merged into the same plate structure that contains the process fluid passages. Both sets of channels are formed within the same high thermal conductivity plate, combining thermal management and process containment functions into a single integrated component, thereby reducing overall device complexity despite the additional thermal control features.
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 effectively reduces thermal cross-talk, maintaining reaction homogeneity, preventing unwanted side products, and enhancing heat exchange, thus ensuring safer and more efficient chemical processing without the need for exotic materials or complex fabrication.
Implementation Method 1
thermal fluid to carry away heat, minimizing thermal cross-talk
Implementation Method 2
Some ceramic materials also have relatively high thermal conductivity, as high as some metals, which can be an advantage where high heat transfer rates are needed in the reactor
Data Source
AI summary
A flow reactor has a module (12) that comprises at least first (20), second (30), and third (40) parallel plates stacked temporarily or permanently together and defining a first thermal fluid layer (25) between the first (20) and second plates (30) and a process fluid layer (35) between the second (30) and third plates (40), the process fluid layer (35) comprising a process fluid passage (32) having two or more U-bends and three or more successive process fluid passage segments joined by respective U-bends, the first thermal fluid layer (25) comprising at least two open thermal fluid channels (26) in the second plate (30), the at least two open channels (26) positioned, when viewed in a plan view of the module (12), between respective adjacent process fluid passage segments.