Co-radial Siphon Valves for Centrifugal Fluidic Systems
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Solution Overview
Problem
Centrifugal fluidic systems face challenges in reliably controlling the release of liquids due to the bursting of capillary valves under high centripetal accelerations, which limits their ability to sequentially distribute liquids without unwanted movement.
Innovation Solution
A co-radial arrangement of siphon structures separated by capillary valves in a fluidic system, where centripetal force is used to control the flow, allowing liquids to be sequentially distributed by alternating accelerations and decelerations, thereby preventing premature valve bursting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capillary valves are used to control liquid flow in centrifugal fluidic systems, then liquid distribution can be controlled by G-force, but the valves burst under high centripetal accelerations
Solution Approach 1:
The invention divides the single valve function into two separate components: a siphon valve for high-G flow control and a capillary valve for low-G flow blocking. This segmentation allows each component to be optimized for its specific function, resolving the contradiction between reliability in flow control and adaptability to high acceleration.
Solution Approach 2:
The system dynamically switches between two valve mechanisms based on the operating conditions. At high centripetal acceleration, the siphon valve becomes active while the capillary valve remains blocked. When acceleration decreases, the capillary valve takes over. This dynamic switching enables the system to adapt to varying G-forces without valve bursting.
2Reliability
If standard siphons with in-between chambers are used, then reliable liquid control is achieved, but precious radial space in the rotor is utilized
Solution Approach 1:
The invention merges the siphon valve and capillary valve into a single integrated structure where the capillary valve is positioned at the bend of the siphon. This combination eliminates the need for separate in-between chambers required by standard siphons, significantly reducing radial space while maintaining reliable liquid control through the coordinated action of both valve mechanisms.
3Measurement precision
If mechanical valves are used for liquid control, then precise control is achieved, but complicated transduction systems are required reducing reliability
Solution Approach 1:
The siphon-capillary valve system is entirely passive and self-actuating, using only the physical principles of siphoning and capillary action in response to centripetal acceleration. No external transduction systems, motors, or complex control mechanisms are required. The valves automatically respond to G-force changes, achieving precise liquid control while minimizing device complexity.
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 arrangement saves radial space, enabling more features on fluidic devices and ensuring robust, sequential distribution of liquids without valve bursting, even under high centripetal forces, by utilizing capillary forces to block and release fluids at specific G-forces.
Implementation Method 1
The inverted U-shaped channel has to be hydrophilic and small enough to provide capillary forces. When the centripetal acceleration is decreased below the capillary force, the siphon is primed.
Implementation Method 2
Centripetal force is commonly used to move small quantity of liquids into micro-channels. When the centripetal G-force is higher than the capillary force, a capillary valve cannot prevent liquid movement within the system.
Data Source
AI summary
Methods and devices using a co-radial arrangement of serial siphon structures composed of siphon valves each separated by a capillary valve to save radial space in a fluidic system. Such serial siphon valves allow to sequentially distribute liquids in a fluidic system upon application of successive centripetal accelerations and decelerations applied to a rotary platform.