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Title: Spreading of a ferrofluid core in three-stream micromixer channels

Abstract

Spreading of a water based ferrofluid core, cladded by a diamagnetic fluid, in three-stream micromixer channels was studied. This spreading, induced by an external magnetic field, is known as magnetofluidic spreading (MFS). MFS is useful for various novel applications where control of fluid-fluid interface is desired, such as micromixers or micro-chemical reactors. However, fundamental aspects of MFS are still unclear, and a model without correction factors is lacking. Hence, in this work, both experimental and numerical analyses were undertaken to study MFS. We show that MFS increased for higher applied magnetic fields, slower flow speed of both fluids, smaller flow rate of ferrofluid relative to cladding, and higher initial magnetic particle concentration. Spreading, mainly due to connective diffusion, was observed mostly near the channel walls. Our multi-physics model, which combines magnetic and fluidic analyses, showed, for the first time, excellent agreement between theory and experiment. These results can be useful for lab-on-a-chip devices.

Authors:
; ;  [1]; ;  [2]
  1. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)
  2. Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075 (Singapore)
Publication Date:
OSTI Identifier:
22403229
Resource Type:
Journal Article
Journal Name:
Physics of Fluids (1994)
Additional Journal Information:
Journal Volume: 27; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-6631
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABUNDANCE; CHEMICAL REACTORS; CLADDING; DIAMAGNETISM; DIFFUSION; FERROMAGNETIC MATERIALS; FLOW RATE; FLUIDS; MAGNETIC FIELDS; NUMERICAL ANALYSIS; PARTICLES; STREAMS; WALLS; WATER

Citation Formats

Wang, Zhaomeng, Varma, V. B., Ramanujan, R. V., E-mail: ramanujan@ntu.edu.sg, Xia, Huan Ming, and Wang, Z. P. Spreading of a ferrofluid core in three-stream micromixer channels. United States: N. p., 2015. Web. doi:10.1063/1.4919927.
Wang, Zhaomeng, Varma, V. B., Ramanujan, R. V., E-mail: ramanujan@ntu.edu.sg, Xia, Huan Ming, & Wang, Z. P. Spreading of a ferrofluid core in three-stream micromixer channels. United States. doi:10.1063/1.4919927.
Wang, Zhaomeng, Varma, V. B., Ramanujan, R. V., E-mail: ramanujan@ntu.edu.sg, Xia, Huan Ming, and Wang, Z. P. Fri . "Spreading of a ferrofluid core in three-stream micromixer channels". United States. doi:10.1063/1.4919927.
@article{osti_22403229,
title = {Spreading of a ferrofluid core in three-stream micromixer channels},
author = {Wang, Zhaomeng and Varma, V. B. and Ramanujan, R. V., E-mail: ramanujan@ntu.edu.sg and Xia, Huan Ming and Wang, Z. P.},
abstractNote = {Spreading of a water based ferrofluid core, cladded by a diamagnetic fluid, in three-stream micromixer channels was studied. This spreading, induced by an external magnetic field, is known as magnetofluidic spreading (MFS). MFS is useful for various novel applications where control of fluid-fluid interface is desired, such as micromixers or micro-chemical reactors. However, fundamental aspects of MFS are still unclear, and a model without correction factors is lacking. Hence, in this work, both experimental and numerical analyses were undertaken to study MFS. We show that MFS increased for higher applied magnetic fields, slower flow speed of both fluids, smaller flow rate of ferrofluid relative to cladding, and higher initial magnetic particle concentration. Spreading, mainly due to connective diffusion, was observed mostly near the channel walls. Our multi-physics model, which combines magnetic and fluidic analyses, showed, for the first time, excellent agreement between theory and experiment. These results can be useful for lab-on-a-chip devices.},
doi = {10.1063/1.4919927},
journal = {Physics of Fluids (1994)},
issn = {1070-6631},
number = 5,
volume = 27,
place = {United States},
year = {2015},
month = {5}
}