Acoustically-controlled Leidenfrost droplets

Boon T. Ng, Yew Mun Hung, Ming K. Tan

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    13 Citations (Scopus)

    Abstract

    Suppressing the Leidenfrost effect can significantly improve heat transfer from a heated substrate to a droplet above it. In this work, we demonstrate that by generating high frequency acoustic wave in the droplet, at sufficient vibration displacement amplitudes, the Leidenfrost effect can be suppressed due to the acoustic radiation pressure exerted on the liquid-vapor interface; strong capillary waves are observed at the liquid-vapor interface and subsequently leads to contact between the liquid and the heated substrate. Using this technique, with 105Hz vibration frequency and 10-6m displacement amplitude of the acoustic transducer, a maximum of 45% reduction of the initial temperature (T0~200-300°C) of the heated substrate can be achieved with a single droplet of volume 10-5l.

    Original languageEnglish
    Pages (from-to)26-32
    Number of pages7
    JournalJournal of Colloid and Interface Science
    Volume465
    DOIs
    Publication statusPublished - 1 Mar 2016

    Keywords

    • Acoustic streaming
    • Capillary wave
    • Heat transfer
    • Leidenfrost droplets
    • Thin film
    • Ultrasound

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