Inertia-enhanced pinched flow fractionation.

Area of Science:

• Microfluidics
• Biomedical Engineering
• Chemical Engineering

Background:

• Particle and cell separation is crucial for chemical and biomedical applications.
• Pinched flow fractionation (PFF) is a microfluidic method for size-based particle separation using laminar flow.
• Existing PFF methods have limitations in throughput and efficiency.

Purpose of the Study:

• To enhance pinched flow fractionation (PFF) using flow-induced inertial lift forces.
• To improve particle separation throughput and efficiency in microfluidic devices.
• To investigate the optimal microchannel geometry for enhanced PFF.

Main Methods:

• Developed inertia-enhanced PFF (iPFF) by exploiting inertial lift forces in microchannels.
• Utilized microfluidic channels with varying geometries, focusing on rectangular channels with a width-to-height aspect ratio of approximately 2.
• Tested iPFF across a range of Reynolds numbers to assess its effectiveness.

Main Results:

• iPFF demonstrated at least a one-order-of-magnitude increase in particle throughput compared to traditional PFF at the same sheath flow rate.
• The technique proved effective over a broad range of Reynolds numbers (spanning more than one order of magnitude).
• Optimal performance was observed in rectangular microchannels with a width-to-height aspect ratio around 2.

Conclusions:

• Inertia-enhanced PFF (iPFF) significantly boosts particle separation throughput in microfluidic systems.
• iPFF offers a robust and efficient method for size-dependent particle separation across various flow conditions.
• Rectangular microchannels with a specific aspect ratio are ideal for maximizing iPFF efficiency.