Temperature dependent thermal conductivity increase of aqueous nanofluid with single walled carbon nanotube inclusion

Sivasankaran Harish, Kei Ishikawa, Erik Einarsson, Shinya Aikawa, Taiki Inoue, Pei Zhao, Makoto Watanabe, Shohei Chiashi, Junichiro Shiomi, Shigeo Maruyama

    Research output: Contribution to journalArticlepeer-review

    50 Citations (Scopus)

    Abstract

    We investigated the thermal and electrical conductivity of water seeded with single-walled carbon nanotubes (SWCNT) synthesized using the alcohol catalytic chemical vapour deposition method. Sodium deoxycholate was used as the surfactant to prepare stable nanofluids, which we then thoroughly characterized by microscopic and spectroscopic methods. Electrical conductivity measurements showed power law dependence with respect to SWCNT loading, while the thermal conductivity increase showed a linear dependence on loading. The effective thermal conductivity of the nanofluid was also found to increase with increasing temperature. Viscosity of the nanofluids showed a threefold increase compared to the thermal conductivity increase, which may play a crucial role in utilizing this fluid for practical applications. We compare experimental results with existing analytical models and discuss the critical role of thermal boundary resistance, which limits the improvement in thermal conductivity. Influence of SWCNT aggregation in the increase of effective thermal conductivity is also discussed.

    Original languageEnglish
    Pages (from-to)213-223
    Number of pages11
    JournalMaterials Express
    Volume2
    Issue number3
    DOIs
    Publication statusPublished - Sep 2012

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)

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