Acoustically-controlled Leidenfrost droplets

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• 作者：Boon T. Ng ; Yew Mun Hung ; Ming K. Tan ; ^{tan.ming.kwang@monash.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Leidenfrost droplets ; Ultrasound ; Acoustic streaming ; Capillary wave ; Thin film ; Heat transfer
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：1 March 2016
• 年：2016
• 卷：465
• 期：Complete
• 页码：26-32
• 全文大小：1740 K

文摘

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 10⁵${10}^5$ Hz vibration frequency and 10^-6${10}^{-6}$ m 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^-5${10}^{-5}$ l.