The Performance and Fabrication of 3D Variable Cross-Section Channel for Passive Microfluidic Control

Area of Science:

• Microfluidics
• Fluid Dynamics
• Additive Manufacturing

Background:

• Passive fluid control in microfluidics relies on localized losses in channel structures.
• Calculating 3D flow fields and manufacturing complex geometries have been significant challenges.

Purpose of the Study:

• To investigate the fluid dynamics of a novel periodic nodular-like microchannel structure.
• To explore the potential of 3D printing for creating complex 3D microfluidic channels.
• To evaluate the performance of these structures in passive fluid control applications.

Main Methods:

• Finite element analysis was used to model the flow in periodic nodular-like channels.
• Experiments were conducted varying Reynolds number and periodic frequency.
• 3D printing was employed to fabricate a periodic tetrahedron channel for validation.

Main Results:

• The variable 3D cross-section structure achieved passive fluid control performance comparable to conventional methods.
• The study analyzed flow fields in complex, periodically varied cross-sections.
• Experimental validation confirmed the finite analysis results.

Conclusions:

• 3D printing enables the fabrication of complex microfluidic channels previously unachievable.
• The developed nodular-like channel structures show significant potential for enhancing passive fluid control devices.
• This research overcomes manufacturing limitations in microfluidic passive fluid control.