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Microfluidic Passive Flow Regulatory Device with an Integrated Check Valve for Enhanced Flow Control.

Xinjie Zhang1,2, Zhenyu Zhang3

  • 1College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, China. xj.zhang@hhu.edu.cn.

Micromachines
|October 2, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a passive microfluidic device for precise liquid flow control. It integrates flow regulation and check valves, ensuring stable forward flow and preventing backflow, ideal for portable Lab-on-a-Chip applications.

Keywords:
flow autoregulationflow check valveflow regulating valvemicrofluidic

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Area of Science:

  • Microfluidics
  • Fluid Dynamics
  • Mechanical Engineering

Background:

  • Passive microvalves offer cost-effective solutions for miniaturized microfluidic systems.
  • Accurate flow control is crucial for Lab-on-a-Chip (LoC) devices.

Purpose of the Study:

  • To develop and characterize a passive flow regulatory device for enhanced microfluidic flow control.
  • To integrate flow regulating and check valve functionalities into a single microfluidic device.

Main Methods:

  • 3D Fluid-Structure Interaction (FSI) simulation to analyze flow regulating valve performance.
  • Prototype fabrication using 3D printing and UV laser cutting.
  • Experimental measurement of flow rates under varied pressures in forward and reverse modes.

Main Results:

  • The device achieved a stable forward flow rate of 0.42 ± 0.02 mL/s between 70-130 kPa inlet pressure.
  • Effective on/off liquid control was demonstrated, with zero backward leakage up to 200 kPa.
  • Key parameters influencing flow rate, including channel dimensions and material properties, were identified.

Conclusions:

  • The passive microfluidic flow regulatory device provides accurate and stable flow control.
  • The device is suitable for low-cost, portable Lab-on-a-Chip (LoC) applications.
  • The integrated design enhances functionality for microfluidic systems.