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Abstract
In this work, directionally distributed Multi-walled Carbon Nanotube (MWCNT) were applied for supercooling suppression and improving the thermal conductivity of deionized water during the solidification. Specifically, Fe3O4 nanoparticles coated MWCNT are magnetized which would be directionally arranged along with the direction of extra magnetic field. A comparative study of solidification characteristics of the water based MWCNT nanofluids was carried out. The results indicated that 0.1% magnetic MWCNT nanofluid shows 31% enhancement in the thermal conductivity under the magnetic field intensity of 150 mT for fully display their axial thermal conductivity, and it exhibits ignorable reduction in the latent heat compared to the pure water. As a result, the magnetic MWCNT nanofluid has the optimal solidification characteristics under the magnetic field with 68% reduction in supercooling and 36% advance in the total solidification time. Moreover, the dynamic characteristics of solid/liquid interface were discussed, and then the growing velocity of ice crystal is obtained.
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