Flow Reactor Mixing via Varying Cross-Sectional Obstacles
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Solution Overview
Problem
Existing flow reactors face challenges in achieving optimal mixing performance while minimizing pressure drop, which is crucial for process intensification in chemical engineering, as they often require larger equipment sizes and higher energy consumption.
Innovation Solution
The flow reactor design features a module with a process fluid passage having a continually varying cross-sectional shape and multiple obstacles that extend partially across the chamber, creating bypass paths and ensuring that no direct line of sight exists from the entrance to the exit, thereby enhancing mixing efficiency and reducing pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional flow reactor channel designs are used, then structural simplicity is maintained, but mixing performance is insufficient and pressure drop is high
Solution Approach 1:
The channel is divided into multiple sections with different cross-sectional shapes along the flow direction. Each section has specific geometric features (rectangular, trapezoidal, triangular configurations) that create localized flow patterns, enhancing mixing while maintaining overall structural simplicity and ease of manufacture.
Solution Approach 2:
The invention transitions from a simple two-dimensional channel to a three-dimensional structure with varying cross-sectional shapes. By modifying the vertical and lateral dimensions at different channel positions, complex flow patterns are generated that improve mixing performance without significantly complicating the manufacturing process.
2Volume of stationary object
If conventional flow reactor channel designs are used, then equipment size is larger, but the device becomes less compact
Solution Approach 1:
The reactor is segmented into multiple functional zones within a compact footprint. By arranging different cross-sectional sections sequentially along the flow path, the design achieves high process intensification in a reduced volume, transforming large-scale processes into smaller, more efficient systems.
Solution Approach 2:
Multiple functional elements are nested within the channel structure. The varying cross-sections create nested flow patterns where fluid streams are repeatedly folded and mixed within the same physical space, maximizing productivity while minimizing reactor volume.
3Ease of manufacture
If simple channel geometries are used, then manufacturing is easier, but mass transfer efficiency is reduced
Solution Approach 1:
Different sections of the channel have locally optimized geometries tailored to specific functional requirements. Rectangular sections provide stable flow, trapezoidal sections enhance mixing, and triangular sections promote mass transfer. This local differentiation maximizes mass transfer efficiency while maintaining overall manufacturing simplicity through standardized fabrication methods.
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 results in improved mixing performance and lower pressure drop, leading to more energy-efficient and compact reactor systems, aligning with the goals of process intensification by optimizing mass and heat transfer coefficients.
Implementation Method 1
a cross-sectional shape which varies continually along the portion... a plurality of obstacles distributed along the portion... enhancing mixing efficiency
Implementation Method 2
successive chambers each with a nozzle-like entrance and a narrowing exit
Data Source
Figure 1~3
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Figure 7~10
AI summary
A flow reactor has a module having a process fluid passage with an interior surface, a portion of the passage including a cross section along the portion having a cross-sectional shape, and a cross-sectional area with multiple minima along the passage. The cross-sectional shape varies continually along the portion and the interior surface of the portion includes either no pairs of opposing flat parallel sides or only pairs of opposing flat parallel sides which extend for a length of no more than 4 times a distance between said opposing flat parallel sides along the portion and the portion contains a plurality of obstacles distributed along the portion.