Morphologic transformation of ferrofluid during micropump driving under field control

Area of Science:

• * Fluid dynamics
• * Magnetohydrodynamics
• * Materials science

Background:

• * Ferrofluid pumps show promise in biomedical, life science, energy, and power research.
• * The underlying mechanisms of ferrofluid fusion and separation during pump operation are not fully understood.
• * Bridging the gap between ferrofluid pump theory and practical application is crucial.

Purpose of the Study:

• * To investigate the dynamic morphological transformations of ferrofluids during pump driving.
• * To analyze the effects of magnetic field polarity, distribution, and ferrofluid mass fraction on ferrofluid behavior.
• * To provide insights for optimizing ferrofluid pump performance.

Main Methods:

• * Optical methods were used to record dynamic morphological transformations.
• * Experiments were conducted on rotating and fixed ferrofluids.
• * Variations in magnetic field polarity, magnetic field distributions, and ferrofluid mass fractions were applied.

Main Results:

• * Magnetic field polarity influences ferrofluid fusion-separation dynamics but not volume segmentation.
• * The ratio of magnetic field intensities dictates volume segmentation; deviations from one reduce pumping efficiency.
• * Ferrofluid mass fraction impacts morphology by causing wall-clinging (high) or bubbles (low), both reducing performance.

Conclusions:

• * Magnetic field characteristics and ferrofluid mass fraction significantly affect ferrofluid pump performance.
• * Understanding these effects is essential for optimizing ferrofluid pump design and efficiency.
• * This research offers valuable references for advancing ferrofluid pump technology.