Related Experiment Video
Updated: Feb 8, 2026
12:26
Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
Published on: August 27, 2013
18.0K
Virtual vortex gear: Unique flow patterns driven by microfluidic inertia leading to pinpoint injection
Chia-Hung Dylan Tsai1, Toshio Takayama2, Yuta Shimozyo2
1Department of Mechanical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan.
Biomicrofluidics
|July 10, 2018
Summary
Virtual vortex gears (VVG) are sequentially generated vortices on microfluidic chips. This study reveals VVG
Area of Science:
- Microfluidics
- Fluid Dynamics
- Biotechnology
Background:
- Microfluidic devices enable precise control over small fluid volumes.
- Sequential vortex generation is a key phenomenon in microfluidic applications.
- Understanding vortex dynamics is crucial for optimizing microfluidic processes.
Purpose of the Study:
- To investigate the phenomenon of sequentially generated vortices, termed virtual vortex gears (VVG).
- To elucidate the underlying mechanism of VVG formation and behavior.
- To explore the application of VVG for precise control in microfluidic systems.
Main Methods:
- Experimental investigation of vortex generation on a microfluidic chip.
- Computational simulations to model and understand VVG mechanisms.
- Development of an inverse mapping technique based on VVG properties.
Main Results:
- VVG exhibits alternating vortex directions, resembling a gear system.
- Vortices are formed from a specific injection point, enabling targeted flow.
- The inverse mapping technique demonstrates pinpoint injection control over microfluidic chamber contents.
Conclusions:
- VVG is a controllable phenomenon in microfluidics.
- Pinpoint injection using VVG can precisely control microfluidic chamber contents.
- VVG offers potential for reduced chemical usage and advanced applications like mixing and valving.
Related Concept Videos
01:18Other Unique Bacteria
449
Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
449
01:16Second Uniqueness Theorem
2.7K
Consider a region consisting of several individual conductors with a definite charge density in the region between these conductors. The second uniqueness theorem states that if the total charge on each conductor and the charge density in the in-between region are known, then the electric field can be uniquely determined.
In contrast, consider that the electric field is non-unique and apply Gauss's law in divergence form in the region between the conductors and the integral form to the surface...
In contrast, consider that the electric field is non-unique and apply Gauss's law in divergence form in the region between the conductors and the integral form to the surface...
2.7K
01:14Moment of Inertia
19.6K
The comparability between linear and angular velocities, linear and angular accelerations, and the kinematic equations of translational and rotational motion can be extended to the concept of inertia.
If a rigid body is rotating about an axis but is not in translational motion, its translational kinetic energy is zero. However, since each particle undergoes rotational motion, it possesses non-zero velocity and kinetic energy. Thus, the kinetic energy of the rigid body, which is the sum of the...
If a rigid body is rotating about an axis but is not in translational motion, its translational kinetic energy is zero. However, since each particle undergoes rotational motion, it possesses non-zero velocity and kinetic energy. Thus, the kinetic energy of the rigid body, which is the sum of the...
19.6K
01:24Inertia Tensor
1.2K
The concept of the inertia tensor is employed to depict the mass distribution and rotational inertia of a solid or rigid object. This tensor is expressed through a three-by-three matrix. Each component within this matrix corresponds to varying moments of inertia about specific axes.
The diagonal components of the inertia tensor matrix represent the moments of inertia concerning the principal axes of the object. These primary axes are defined as the axes where the object experiences the least...
The diagonal components of the inertia tensor matrix represent the moments of inertia concerning the principal axes of the object. These primary axes are defined as the axes where the object experiences the least...
1.2K
01:20Virtual Work
1.4K
The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
In static equilibrium, a body can experience an imaginary or virtual movement, such as displacement or rotation. The virtual work done by a force is equal to the dot product of force and virtual displacement in the direction of the force. When it comes to virtually rotating a...
In static equilibrium, a body can experience an imaginary or virtual movement, such as displacement or rotation. The virtual work done by a force is equal to the dot product of force and virtual displacement in the direction of the force. When it comes to virtually rotating a...
1.4K
01:17Moments of Inertia for Areas
2.6K
The second moment of area, also known as the moment of inertia of an area, is a geometric property of a shape that reflects its resistance to change. The moment of inertia of an area is expressed in terms of a single number and can be calculated for both two-dimensional and three-dimensional shapes. The moment of inertia of an area is calculated by taking the sum of the product of the area and the square of its distance from a chosen axis of rotation. The moment of inertia is expressed in units...
2.6K