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Magnetic Control of Ferrofluid Droplet Adhesion in Shear Flow and on Inclined Surfaces

Cite this: Langmuir 2020, 36, 36, 10885–10891
Publication Date (Web):September 3, 2020
https://doi.org/10.1021/acs.langmuir.0c02369
Copyright © 2020 American Chemical Society

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    Abstract

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    The manipulation of ferrofluidic droplets by magnetic fields is a popular technique for controlling fluid transport in open microfluidic systems. We examine the effect of gravity and shear flow external forces on the adhesion properties of sessile ferrofluidic droplets in the presence of a uniform magnetic field. The magnetic field was found to enhance the critical Bond number at which sliding begins on a tilting substrate but suppress the critical Weber number at which sliding begins in a moderate Reynolds number channel flow. The divergent adhesion trends are explained in terms of the shape deformation induced in the ferrofluidic droplet, the substrate wettability, and the apparent contact angle variation induced by the droplet deformation.

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    Cited By

    This article is cited by 6 publications.

    1. Gudlavalleti V V S Vara Prasad, Purbarun Dhar, Devranjan Samanta. Magneto-Elastic Effect in Non-Newtonian Ferrofluid Droplets Impacting Superhydrophobic Surfaces. Langmuir 2021, 37 (32) , 9673-9682. https://doi.org/10.1021/acs.langmuir.1c00885
    2. Zixian Li, Decai Li, Yanwen Li, Shuntao Han. Influence of High Viscosity and Magnetoviscous Effect on the Washout Resistance of Magnetic Fluid. Magnetochemistry 2023, 9 (5) , 134. https://doi.org/10.3390/magnetochemistry9050134
    3. Sithara Vinod, John Philip. Thermal and rheological properties of magnetic nanofluids: Recent advances and future directions. Advances in Colloid and Interface Science 2022, 307 , 102729. https://doi.org/10.1016/j.cis.2022.102729
    4. Lukesh Kumar Mahato, Deepak Kumar Mandal. A sessile drop facing a shear flow: Surrounding flow dynamics during the deformation of the drop. International Journal of Multiphase Flow 2022, 147 , 103911. https://doi.org/10.1016/j.ijmultiphaseflow.2021.103911
    5. Mohammad Jamali, Hooman V Tafreshi. Studying droplet adhesion to fibers using the magnetic field: a review paper. Experiments in Fluids 2021, 62 (8) https://doi.org/10.1007/s00348-021-03258-9
    6. Zhaoyi Wang, Ran Tao, Jun Wu, Bing Li, Chonglei Hao. Impingement-assisted self-assembly of ferrofluid droplets under magnetic field. Applied Physics Letters 2021, 119 (4) https://doi.org/10.1063/5.0059420

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