Microfluidic Inlet Layout for Uniform Velocity and Sensor Area
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Solution Overview
Problem
Existing microfluidic devices exhibit non-uniform velocity profiles across channels, reducing sensor accuracy and throughput, and often have large inlet and outlet structures that reduce the available sensor area and cause sedimentation of particles.
Innovation Solution
The design includes an inlet and outlet configuration that promotes substantially uniform fluid flow across a significant portion of the channel, minimizing sedimentation and maximizing sensor area, with a ratio of cross-sectional areas and dimensions optimized for uniform flow and manufacturability.
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 employs specific geometric parameters including a width-to-depth ratio between 2:1 and 10:1, and a length-to-width ratio between 1:1 and 5:1, to transform the velocity profile from non-uniform to substantially uniform across the channel width, thereby improving sensor accuracy without excessive complexity
Solution Approach 2:
The inlet structure is designed with specific local geometric characteristics (width, depth, length ratios) that differ from conventional designs, creating a localized flow conditioning region that produces uniform velocity profiles specifically where sensors are positioned
2Area of stationary object
If large inlet and outlet structures are used, then fluid transport is enabled, but available sensor area is reduced
Solution Approach 1:
The inlet and outlet structures utilize optimized dimensional parameters (width-to-depth ratio of 2:1 to 10:1, length-to-width ratio of 1:1 to 5:1) that minimize their footprint while maintaining effective fluid transport function, thereby maximizing the remaining substrate area available for sensor integration
Solution Approach 2:
The design considers three-dimensional positioning and dimensional relationships of inlet/outlet structures relative to the sensor plane, optimizing vertical and lateral dimensions to minimize area occupation while preserving throughput capability
3Reliability
If conventional channel flow is used, then fluid transport is enabled, but particle sedimentation occurs
Solution Approach 1:
The inlet structure geometry (width-to-depth ratio 2:1 to 10:1, length-to-width ratio 1:1 to 5:1) is specifically designed to produce substantially uniform velocity profiles that eliminate flow stagnation zones and promote continuous particle transport, preventing sedimentation while maintaining flow stability
4Productivity
If non-uniform velocity profiles are produced, then fluid transport occurs, but throughput is impeded
Solution Approach 1:
By optimizing the inlet structure parameters (width-to-depth ratio 2:1 to 10:1, length-to-width ratio 1:1 to 5:1), the design achieves substantially uniform velocity profiles that maximize throughput without requiring complex multi-channel or branched configurations
Data Source
AI summary
A method for fluid transport includes receiving fluid at an inlet port of an inlet. The fluid is outputted through an opening of the inlet into a channel. A first ratio of a first distance to a second distance is substantially equal to a cubic root of a second ratio between a first length dimension and a second length dimension of the inlet, the first distance being measured from an entrance of the inlet port to a first position within the inlet, the second distance being measured from the entrance of the inlet port to a second position within the inlet, the first length dimension and the second length dimension each being measured along a direction orthogonal to a measurement direction along the first distance and the second distance, the first length dimension and the second length dimension being measured at the first position and the second position, respectively.