Instability-Induced Mixing of Ferrofluids in Uniform Magnetic Fields

摘要: The advantages of ferrofluids in microfluidic lab-on-a-chip applications include remote control the fluid flow within chips, e.g., mixing species using an external uniform magnetic field. Hence, three-stream systems consisting a ferrofluid core clad by two streams diamagnetic silicone oil were studied. instability ferrofluid, subjected to field, was also When strength this field increased critical value, spread toward and transient developed at ferrofluid–silicone interface. Further increasing resulted periodic structures permanent instability. effect strength, rate, rate ratio determined. With higher ratio, observed only larger strength. Our modeling results consistent with these experimental results. work shows that few millitesla can lead mixing, thus it is relevant practical devices.