Microfluidic Inlet Layout for Uniform Channel Flow and Sensor Coverage
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Solution Overview
Problem
Microfluidic devices often exhibit non-uniform velocity profiles, reducing sensor accuracy and throughput due to the design of inlet and outlet structures, which can be separated by significant distances and occupy large footprints, limiting the available substrate area for sensors and causing edge effects and sedimentation issues.
Innovation Solution
A microfluidic device design featuring an inlet and outlet configuration that provides substantially uniform fluid flow across a channel, with a ratio of cross-sectional areas and dimensions optimized to minimize resistance and promote even flow, allowing for a larger sensor area and reduced sedimentation, and incorporating a parallel plate structure to facilitate efficient manufacturing and flow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inlet and outlet structures are used, then fluid transport is enabled, but non-uniform velocity profiles are produced reducing sensor accuracy
Solution Approach 1:
The inlet structure is divided into multiple inlet ports distributed across the width of the channel, with each port feeding a specific region. This segmentation allows independent control of flow distribution across different channel sections, enabling uniform velocity profiles while maintaining functional fluid transport capability
Solution Approach 2:
Each inlet port is designed with specific dimensional characteristics (width, depth, spacing) optimized for its local position in the channel. The inlet ports have varying dimensions to compensate for edge effects and ensure uniform flow distribution across the channel width, directly improving velocity profile uniformity and sensor measurement accuracy
2Area of stationary object
If inlet and outlet structures are designed with large footprints, then fluid transport capacity is increased, but available substrate area for sensors is significantly reduced
Solution Approach 1:
The inlet structure utilizes the vertical dimension by extending inlet ports downward into the channel depth rather than occupying lateral space. Multiple inlet ports are arranged vertically and horizontally to provide comprehensive flow distribution without requiring large lateral footprints, thereby maximizing sensor area while maintaining transport capacity
Solution Approach 2:
The inlet ports are positioned within and around the channel structure in a nested arrangement, with inlet bodies containing multiple ports that feed into the channel from different locations. This nested configuration provides extensive fluid transport capability while minimizing the external footprint occupied by inlet and outlet structures
3Productivity
If inlet ports are positioned far from sensor areas, then uniform flow distribution is achieved, but throughput is impeded due to channel length
Solution Approach 1:
Multiple inlet ports are distributed along the channel length and width, with sensors strategically positioned to be in fluid communication with appropriate inlet ports. This segmentation reduces the effective distance fluid must travel to reach sensor areas while maintaining uniform flow distribution through the distributed inlet configuration
Solution Approach 2:
The inlet ports serve as intermediary structures that directly feed fluid to sensor regions through optimized channel connections. By positioning inlet ports in fluid communication with sensor areas and designing appropriate channel geometries, the system achieves both short transport distances and uniform flow distribution simultaneously
Data Source
AI summary
A microfluidic system for fluid transport is provided. The microfluidic system includes a microfluidic device. The microfluidic device includes an inlet body including an inlet. The microfluidic device includes a base supporting the inlet body. The base includes a channel in fluid communication with the inlet. The base includes one or more sensors formed on a surface of the channel, or one or more sensors formed in one or more wells formed in the surface of the channel. The channel is configured to facilitate flow of the fluid. The fluid includes a plurality of beads. The fluid includes a plurality of suspended cells. The inlet is configured to receive the fluid at an inlet port. The inlet is configured to output the fluid through an opening in fluid communication with the channel. The inlet is configured to provide substantially uniform flow of the fluid across a substantial portion of a horizontal dimension of the channel. The device is configured to compensate for edge effects otherwise present therein. Related methods, apparatuses, systems, techniques and articles are also described.