Volume 6, Issue 3 (March 2009)

    Severity of Quenching and Kinetics of Wetting of Nanofluids and Vegetable Oils

    (Received 15 April 2008; accepted 4 February 2009)

    Published Online: 2009

    CODEN: JAIOAD

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    Abstract

    In the present work, the suitability of vegetable oil blends with mineral oil and alumina based nanofluids as quench media for industrial heat treatment was investigated. Sunflower oil, palm oil, and mineral oil were used for preparing the blends. Alumina based nanofluids of varying concentrations ranging from 0.01–4 % were used. The size of alumina particles was about 50 nm. The severity of quenching and heat transfer coefficients were estimated during quenching of copper probes. Heat transfer coefficients were estimated using a lumped heat capacitance model. The static contact angle was measured on copper substrates having a surface texture similar to the probes used for estimation of heat transfer coefficients. A dynamic contact angle analyzer was used for this purpose. The measured contact angles of nanofluids on copper were high compared to oils, indicating poor wetting by quench media that are polar in nature. Wetting characteristics had a significant effect on heat transfer coefficients estimated during quenching.


    Author Information:

    Jagannath, Vaishali
    National Institute of Technology Karnataka, Mangalore, Karnataka State

    Prabhu, K. Narayan
    National Institute of Technology Karnataka, Mangalore, Karnataka State


    Stock #: JAI101800

    ISSN: 1546-962X

    DOI: 10.1520/JAI101800

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    Title Severity of Quenching and Kinetics of Wetting of Nanofluids and Vegetable Oils
    Symposium , 0000-00-00
    Committee A01