Boiling Heat Transfer Enhancement in Nanofluid

Purpose

Recently, heat flux of electronic devices has been increasing with decreasing the size. Therefore, there is a demand to increase the boiling heat transfer, and many techniques have been developed for the heat transfer enhancement. Nanofluid is a fluid suspended with nano-order particles. It is known that boiling heat transfer increases using nanofluid in comparison to that in the pure fluid. This may be occurred because of the change of the fluid properties, and/or the particle depositions. However, the mechanisms and the optimizations of the nanoparticle condition have not been fully understood.
Aim of this study is clarification of mechanism of the boiling heat transfer enhancement using nanofluid and development of passively controlling the heat transfer enhancement using a magnetic field.

　

Research content

　

In this study, pool boiling experiments using Fe3O4/water nanofluids have been conducted with changing of the volume concentration. The boiling heat transfers are compared with pure water and the nanofluids. A schematic diagram of the experimental setup and the boiling behavior in pure-water are shown in figures. The nanoparticles are mixed with pure water using an ultrasound bath. The volume concentration is ranging between 0.01 and 0.2%. Furthermore, a method for passively controlling the heat transfer enhancement using a magnetic field has been developed. The neodymium magnets are used for applying the magnetic filed with changing the distance between the magnets.

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