Microchannel Device Air Bubble Backflow Prevention
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Solution Overview
Problem
Existing microchannel devices face challenges in retaining test solutions in the collection portion after discharge, leading to potential backflow into the main channel, which can affect the independence and accuracy of microchannel operations.
Innovation Solution
A microchannel device with a collection portion that includes a pool, a connection channel, and a protrusion to generate air bubbles, preventing backflow by closing the connection channel and ensuring the test solution is retained in the collection portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the test solution is discharged from the main channel to the collection portion, then the microchannels are made independent from each other, but the test solution may flow back into the main channel
Solution Approach 1:
The patent introduces an air column as an intermediary substance between the test solution in the collection portion and the main channel. This air column acts as a barrier that prevents the test solution from flowing back into the main channel while allowing the collection portion to remain connected to the main channel structure. The air column is introduced through the protrusion that generates air bubbles in the connection channel.
Solution Approach 2:
The patent changes the physical state of the connection channel by introducing air bubbles that alter the fluid dynamics parameters. The air column changes the pressure distribution and flow characteristics in the connection channel, creating a barrier that prevents backflow while maintaining the structural connection between the collection portion and main channel.
2Reliability
If air bubbles are generated to close the connection channel, then backflow is prevented, but the device complexity increases
Solution Approach 1:
The collection portion is segmented into distinct functional zones: the pool for storing test solution, the connection channel for fluid communication, and the protrusion for air bubble generation. This segmentation allows each component to perform its specific function efficiently while keeping the overall structure manageable and understandable.
Solution Approach 2:
The protrusion structure automatically generates air bubbles when test solution flows into the collection portion, utilizing the natural flow dynamics and pressure changes. This self-service mechanism eliminates the need for external air injection systems or complex control mechanisms, thereby reducing device complexity while maintaining backflow prevention functionality.
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
The solution effectively prevents the test solution from flowing back to the main channel, maintaining the independence of microchannels and ensuring accurate results by retaining the solution in the collection portion.
Implementation Method 1
a protrusion that is arranged in the connection channel to generate air bubbles between the protrusion and an inner wall of the connection channel to close the connection channel
Implementation Method 2
generate air bubbles between the protrusion and an inner wall of the connection channel to close the connection channel, upon receiving the test solution discharged from the main channel
Data Source
AI summary
A microchannel device includes an opening that receives a test solution, a main channel that communicates with the opening, and a collection portion provided at an outlet-side end of the main channel. The collection portion includes a pool that stores the test solution, a connection channel that connects the pool with the outlet-side end, and a protrusion that is arranged in the connection channel to generate air bubbles between the protrusion and an inner wall of the connection channel to close the connection channel, upon receiving the test solution discharged from the main channel.