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Micromachines 2018, 9(9), 457; https://doi.org/10.3390/mi9090457

Thermal-Flow Characteristics of Ferrofluids in a Rotating Eccentric Cylinder under External Magnetic Force

1
Graduate School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea
2
Chassis-Trim Analysis Team, Hyundai Mobis, Yongin 16891, Korea
3
School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea
*
Author to whom correspondence should be addressed.
Received: 19 August 2018 / Revised: 7 September 2018 / Accepted: 10 September 2018 / Published: 12 September 2018
(This article belongs to the Special Issue NANO KOREA 2018)
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Abstract

Heat dissipation has become an important issue due to the miniaturization of various electronic devices. Various methods such as spray and nozzle coolers, heat sinks and so on are used for heat dissipation. However, the emergence of ferrofluids drastically improves the operating characteristics of electromagnetic systems and devices. A ferrofluid is a suspension containing 10-nm magnetic particles in a colloidal solution. This material exhibits paramagnetic behavior and is sensitive to magnetic field and temperature. In this study, heat transfer characteristics of ferrofluids in a rotating eccentric cylinder were investigated using the commercial code, COMSOL Multiphysics. Numerical results of the local Nusselt number, magnetophoretic force and velocity distributions were obtained from various eccentricities of the cylinder, and the results were graphically depicted with various flow conditions. View Full-Text
Keywords: ferrofluid; magnetic body force; computational fluid dynamics (CFD); finite element method (FEM); magnetic material ferrofluid; magnetic body force; computational fluid dynamics (CFD); finite element method (FEM); magnetic material
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kim, J.-H.; Seo, H.-S.; Kim, Y.-J. Thermal-Flow Characteristics of Ferrofluids in a Rotating Eccentric Cylinder under External Magnetic Force. Micromachines 2018, 9, 457.

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