High-performance microfluidic rectifier based on sudden expansion channel with embedded block structure.

Area of Science:

• Fluid Dynamics
• Microfluidics
• MEMS Technology

Background:

• Microfluidic devices often require precise control of fluid flow.
• Traditional microfluidic rectifiers may involve complex structures or moving parts, limiting their applicability in high-pressure environments.

Purpose of the Study:

• To propose and evaluate a novel, high-performance microfluidic rectifier.
• To demonstrate flow rectification without the need for moving parts, suitable for micro-electro-mechanical-systems (MEMS).

Main Methods:

• A microfluidic rectifier design incorporating a microchannel and a sudden expansion channel with an embedded block structure was developed.
• Flow rectification performance was assessed using both experimental and numerical simulations.
• The rectification performance index (diodicity, Di) was calculated.

Main Results:

• The proposed device successfully induced vortex structures under reverse flow conditions, increasing flow resistance.
• Experimental and numerical diodicity values were found to be 1.54 and 1.76, respectively.
• The device demonstrated superior rectification performance compared to existing valveless rectifiers.

Conclusions:

• The developed microfluidic rectifier achieves efficient flow rectification without moving parts.
• The design is well-suited for high-pressure environments typical of MEMS devices.
• This valveless microfluidic rectifier offers enhanced performance over existing technologies.