Suppressing Interfacial Instability of Immiscible Liquid-in-Liquid Flow Using Magnetic Forces.

Area of Science:

• Fluid dynamics
• Interface science
• Magnetohydrodynamics

Background:

• Interfacial instability limits the continuous flow of liquid jets in air or other fluids.
• Controlling these instabilities is crucial for various engineering and scientific applications.

Purpose of the Study:

• To investigate the suppression of interfacial instability in liquid jets using magnetic forces.
• To explore the stability limits and control mechanisms of magnetically stabilized liquid jets.

Main Methods:

• Experimental investigation of liquid jet stability under the influence of a magnetic ferrofluid envelope.
• Systematic variation of magnetic force strength and analysis of stability limits governed by the magnetic Bond number.

Main Results:

• Successful suppression of interfacial instability was achieved by applying a magnetic force via a ferrofluid envelope.
• Instabilities could be externally induced and reversibly controlled by adjusting magnetic force strength.
• The magnetic Bond number was identified as the key parameter governing length and time scales of stability.

Conclusions:

• Magnetic ferrofluid envelopes offer an effective method to control interfacial instability in liquid jets.
• This technique expands the operational limits of fluid systems beyond standard hydrodynamics.
• Potential applications include flow chemistry, interface engineering, and biological material transport.