Study of Passive Fluid Mixing in Microfluidic Devices

This study investigates passive fluid mixing in microfluidic devices through experimental evaluation of three geometries: straight channel, zigzag channel, and flow-splitting channel. Mixing was characterized using a custom-built syringe pump, 3D-printed devices, and ImageJ analysis. Results demonstrated that flow-splitting geometries achieved efficient mixing at lower flow rates compared to zigzag geometries. This work provides valuable insights for designing cost- effective micromixers for lab-on-a-chip applications, particularly in biomedical and chemical diagnostics.