Alternating Rotation Mixing in Centrifugal Microfluidic Substrates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Micro-fluidic devices using centrifugal force face challenges in rapidly mixing fluids due to laminar flow at low Reynolds numbers, with existing solutions requiring significant space or additional components like magnetic beads and magnets.
Innovation Solution
A method involving a rotating microchannel substrate with alternating clockwise and counter-clockwise rotations to create and maintain turbulence in the mixing chamber, facilitating rapid fluid mixing without the need for additional space or components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If centrifugal force is used to drive fluid flow in micro-fluidic devices, then fluid flow can be controlled, but rapid mixing of fluids cannot be achieved due to laminar flow at low Reynolds numbers
Solution Approach 1:
The patent applies periodic action by alternating the rotation direction of the micro-fluid treatment substrate between clockwise and counter-clockwise directions. This periodic reversal creates turbulent flow patterns that enhance mixing efficiency. The substrate rotation is controlled to switch directions before the vortex from one direction dissipates, maintaining continuous turbulence and rapid mixing throughout the fluid treatment process.
2Productivity
If a CD-shaped micro-fluid treatment substrate with micro-cavity and curved mixing channel is used, then fluid mixing can be performed, but the substrate occupies too large volume of space
Solution Approach 1:
The patent applies dynamics by making the substrate itself rotatable rather than using static mixing channels. The micro-fluid treatment substrate is rotated alternately in clockwise and counter-clockwise directions to create mixing action. This dynamic approach eliminates the need for large curved mixing channels and micro-cavities, reducing the overall substrate volume while maintaining effective mixing capability.
3Productivity
If magnetic beads and magnets are introduced to induce fluid mixing, then rapid mixing can be achieved, but additional components and complex arrangements are required
Solution Approach 1:
The patent applies self-service by using the substrate's own rotation to generate mixing action. The micro-fluid treatment substrate rotates alternately in clockwise and counter-clockwise directions, creating vortexes and turbulent flow patterns that mix the fluids. This eliminates the need for external magnetic beads, magnets, or other additional mixing components, simplifying the device structure while maintaining rapid mixing capability.
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 method enables efficient and rapid mixing of fluids within micro-fluidic devices, achieving homogeneous mixing in less than a second without increasing device size or requiring additional elements like magnets.
Implementation Method 1
a micro-fluidic device which uses centrifugal force
Implementation Method 2
providing an alternating rotation of the substrate in clockwise and counter-clockwise directions until the at least two kinds of fluids are mixed in the chamber
Data Source
AI summary
Provided is a method of mixing fluids including introducing at least two kinds of fluids to a chamber of a substrate including a microchannel structure; and alternately rotating the substrate clockwise and counter-clockwise until the at least two kinds of fluids are mixed, wherein the rotation is changed from one direction to the opposite direction before a vortex created in the mixing chamber by the one direction rotation disappears.