Non-Invasive Manipulation of Two-Phase Liquid-Liquid Slug Flow Parameters Using Magnetofluidics

Area of Science:

• Fluid dynamics
• Microfluidics
• Process intensification

Background:

• Liquid-liquid slug flow in microchannels is critical for heat and mass transfer.
• Traditional microchannel pumps face challenges with mechanical wear and invasive operation.
• Controlling flow properties like phase ratio and slug length is essential for microfluidic applications.

Purpose of the Study:

• To develop a non-invasive, energy-efficient method for manipulating liquid-liquid slug flow in microchannels.
• To utilize magnetofluidics for enhanced control over microflow parameters.
• To present an alternative to conventional microfluidic pumps.

Main Methods:

• Production of a ferrofluid with reproducible properties for stable slug flow.
• Application of magnetic gradients using permanent magnets to manipulate two-phase flow.
• Development of an electromagnetic non-invasive valve for continuous operation and phase ratio regulation.
• Modification of a decanter design using electromagnetism for membrane-free phase separation.

Main Results:

• Stable liquid-liquid slug flow was generated using a ferrofluid and a second phase.
• A non-invasive pump system utilizing magnetic fields was demonstrated.
• An electromagnetic valve enabled continuous operation and phase ratio control.
• Electromagnetically modified decanter achieved phase separation without membranes.

Conclusions:

• Magnetofluidics offers a viable non-invasive approach for controlling microfluidic slug flow.
• The developed system provides energy efficiency and reduced mechanical interfacing compared to traditional pumps.
• This technology enhances controllability for process intensification in microchannels.