Abstract
Technological advancements in thermal systems demand an innovative heat dissipation technology. Magnetorheological (MR) fluid has a huge potential to solve the problem. However, characterising thermal conductivity of the materials in magnetic fields required tailored instruments. This paper presents a concept design of the MR fluids thermal conductivity measurement instrument. The developed instrument was designed to be able to measure thermal conductivity in both parallel and perpendicular orientations with magnetic field. Magnetic fields distribution of the proposed concept design was analysed using finite element method for magnetics. Design modification then conducted to improve the magnetic fields strength. Findings of this study showed that gap thickness played a significant factor in determining the optimal design. Simulated magnetic fields strength at both parallel and perpendicular orientations were found identical, yet varied in distributions.
Highlights
Magnetorheological (MR) fluid is a suspension that possesses alterable rheological properties in magnetic field presence
Three parameters are being looked into namely polymethyl methacrylate (PMMA) diameter, PMMA height and gap thickness
It is clearly found that gap thickness played a significant factor in determining the optimal design
Summary
Magnetorheological (MR) fluid is a suspension that possesses alterable rheological properties in magnetic field presence. Due to this advantage, MR fluid is beneficial to be applied in active and semi-active devices [1]. The finding was experimentally done by Yildirim and Genc [3] in which the thermal conductivity of MR fluid increased along with increasing magnetic field. This behaviour is attributed to the formation of chain-like structures by the magnetic particles when subjected to magnetic field, which provide high conductivity heat transfer paths [4]. Reinecke et al [5] found that thermal conductivity of MR fluid increased by almost 100% when thermal gradient is parallel with magnetic field
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