Self-similar pinch-off mechanism and scaling of ferrofluid drops

Abstract : The pinch off of heterogeneous ferrofluid drops at a nozzle in air was experimentally investigated with a magnetic field (downward or upward) and without a magnetic field. Compared to homogeneous drops, the self-similarity and universal scaling law were verified through modifying the initial conditions, such as the nozzle diameter, flow rate, and magnitude and direction of the magnetic fields. Two pinch-off points were observed, and the two consecutive pinch-off dynamics were characterized through scaling laws. Here our scaling exponent remains within the scope of (0.70-0.80) for the primary whereas it remains within the scope of (0.60-0.70) for the secondary pinch off, respectively, comparable to the classic range from 2/3 to 1 for homogeneous drops. The gravity-compensating and gravity-superimposing magnetic fields display a negligible effect on the exponent but determine the sequence of double pinch offs. The universal character of the self-similar pinch off is extended to a heterogeneous fluid.
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Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2015, 92 (6), 〈10.1103/PhysRevE.92.061003〉
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Soumis le : vendredi 12 février 2016 - 13:02:06
Dernière modification le : vendredi 15 juin 2018 - 11:22:01

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Xiao F. Jiang, Huai Z. Li. Self-similar pinch-off mechanism and scaling of ferrofluid drops. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2015, 92 (6), 〈10.1103/PhysRevE.92.061003〉. 〈hal-01273382〉

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