Microfluidic Device Flow Splitting Cape Design

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Solution Overview

Problem

Microfluidic devices face challenges in efficiently mixing fluids and reducing pressure resistance within microreactors, particularly due to issues like vortices and 'dead zones' that affect mixing quality and throughput.

Innovation Solution

The microfluidic device design incorporates reactant passages with chambers, subpassages, flow-splitting, and flow-joining regions, including flow-directing capes, which diverge and converge to optimize fluid flow, and feature bends that change fluid direction by at least 90°, enhancing mixing and reducing pressure resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional microchannel designs are used, then device simplicity is maintained, but fluid mixing efficiency deteriorates due to vortices and dead zones

Engineering Contradiction:

Improvefluid mixing efficiencyVSAvoidpassage structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The microchannel is segmented into multiple functional regions including flow-splitting regions with flow-directing capes, reaction regions, and flow-joining regions. This segmentation eliminates dead zones and vortices by directing flow through distinct pathways, improving mixing efficiency while maintaining manageable structural complexity through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention introduces vertical dimensionality with flow-directing capes that extend into the channel cross-section, creating three-dimensional flow control structures. These capes manipulate flow patterns in the vertical dimension to eliminate dead zones and improve mixing without requiring complex lateral passage arrangements.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If straight microchannel passages are used, then pressure resistance is reduced, but fluid mixing efficiency deteriorates due to lack of flow direction changes

Engineering Contradiction:

Improvefluid mixing efficiencyVSAvoidpressure resistance

Core Design Contradiction:

ProductivityVSStress or pressure

Solution Approach 1:

The channel is divided into straight pressure-reducing sections and curved mixing sections. The straight sections minimize pressure loss, while the curved sections with bends (≥90°) and flow-directing capes enhance mixing. This segmentation allows the system to benefit from both straight and curved passage advantages.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sections of the microchannel have different geometric qualities optimized for their specific function: straight sections for low pressure resistance, curved sections with bends for flow direction change, and sections with flow-directing capes for enhanced mixing. Each local region has tailored properties matching its functional requirement.

Inventive Principle:

Principle #3Local quality

3Productivity

If single-passage microreactors are used, then device complexity is minimized, but throughput is limited

Engineering Contradiction:

ImprovethroughputVSAvoidnumber of passages

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The microreactor is segmented into multiple parallel passages (e.g., four passages), each with identical flow-splitting and flow-joining regions. This parallel segmentation increases throughput capacity while maintaining standardized modular units that simplify overall device design and manufacturing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple parallel passages are merged through common flow-splitting regions at the inlet and flow-joining regions at the outlet. This merging approach allows independent operation of each passage for high throughput while using shared structural elements to minimize overall device complexity.

Inventive Principle:

Principle #5Merging (Combining)

4Productivity

If microchannels without flow-directing features are used, then manufacturing precision requirements are reduced, but mixing quality deteriorates due to dead zones

Engineering Contradiction:

Improvemixing qualityVSAvoidflow-directing feature precision

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The flow-directing function is segmented into discrete flow-directing capes with defined termini positioned at specific locations in the flow-splitting and flow-joining regions. This segmentation allows precise control of flow patterns through well-defined geometric features that can be manufactured with standard precision while effectively eliminating dead zones.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Flow-directing capes are positioned in advance at critical locations to pre-direct flow patterns before mixing occurs. The capes are strategically placed to establish optimal flow trajectories that prevent dead zone formation, ensuring high mixing quality without requiring complex real-time adjustments.

Inventive Principle:

Principle #10Preliminary action

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 mixes immiscible liquids and multiphase mixtures, improving mixing quality and reducing pressure drop, thereby increasing throughput and eliminating issues like vortices and 'dead zones' within the microreactor.

Implementation Method 1

a flow-splitting region (150) disposed between the two subpassages (140, 145) and the chamber inlet (120), such that the flow-splitting region (150) divides the chamber inlet (120) into the two subpassages (140, 145)

Methodology Applied

Scientific EffectFlow splitting:

Implementation Method 2

a flow-joining region (160) disposed between the two subpassages (140, 145) and the chamber outlet (130), such that the flow-joining region (160) merges the two subpassages (140, 145)

Methodology Applied

Scientific EffectFlow joining:

Implementation Method 3

Each subpassage (140) comprises at least one bend (170). Each bend (170) may define a shape configured to change the direction of fluid flow within the subpassage (140) by at least 90°

Methodology Applied

Scientific EffectFlow direction control:

Implementation Method 4

This design effectively mixes immiscible liquids and multiphase mixtures, improving mixing quality and reducing pressure drop

Methodology Applied

Scientific EffectFluid mixing:

Data Source

PatentEP2435174B1Flow controlled microfluidic devices

Publication Date: 2014.03.12 CORNING INC

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Figure 3A~3C

AI summary

A microfluidic device (10) comprises at least one reactant passage (60) defined within a layer (50) of the microfluidic device (10) and comprising one or more chambers (70, 75) disposed along a central axis (110). Each chamber (100) is divided at a flow-splitting region (150) into two subpassages (140, 145) that diverge from the central axis (110) and then converge together at a flow-joining region (160). The flow-splitting region (150), the flow-joining region (160) or both may comprise at least one flow-directing cape (180, 185) comprising a terminus (190, 195) positioned along the central axis (110). In some embodiments, each subpassage (140) may comprise at least one bend (170). In other embodiments, each subpassage (310) may comprise at least two spaced bends (330, 335).