Thermal conduction anisotropy of a magnetic functional fluids utilizing cluster formation of dispersed fine particles (in the case of micron-sized graphite particles)

Issue title: Selected papers from the International Symposium on Applied Electromagnetics and Mechanics - ISEM 2019

Guest editors: Jinhao Qiu, Ke Xiong and Hongli Ji

Article type: Research Article

Authors: Ido, Yasushi^a; | Iwamoto, Yuhiro^a | Inden, Takuya^a

Affiliations: [a] Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Nagoya, Japan

Correspondence: [*] Corresponding author: Yasushi Ido, Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan. E-mail: ido.yasushi@nitech.ac.jp

Abstract: The thermal conductivity of a magnetic fluid is expected to enhance by adding micron-sized particles with high thermal conductivity. The thermal conductivity of the magnetic fluid containing micron-sized graphite particles was investigated experimentally. The shapes of the graphite particles were sphere and flake-like. As the results of visualization experiments using the dark field microscope, the spherical graphite particles form chain-like clusters under applied magnetic field, while the fibrous structure is formed by the flake-like graphite particles, however, chain-like cluster formation cannot be clearly observed. The experiments using the transient hot-wire method showed that the thermal conductivity of magnetic fluid containing graphite particles is enhanced by applying magnetic field and by increasing the volume fraction of graphite particles.

Keywords: Magnetic fluid, cluster, graphite particle, thermal conductivity, dark field microscopy

DOI: 10.3233/JAE-209392

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 64, no. 1-4, pp. 799-805, 2020