Contact
    Start Publications Experimental study on the evaporation of sessile droplets ...
    ←  Publication Finder
    Attension

    Experimental study on the evaporation of sessile droplets excited by vertical and horizontal ultrasonic vibration

    Year: 2017

    Journal: Int. J. Heat Mass Transf., Volume 114, NOV, page 786–795

    Authors: Rahimzadeh, Amin; Eslamian, Morteza

    Organizations: Shanghai Municipal Education Commission; National Natural Science Foundation of China (NSFC)

    Keywords: Sessile droplet; Ultrasonic vibration; Droplet evaporation; Droplet oscillation; Contact angle; Stick-slip

    Interaction between sessile droplets and solid surfaces is a fundamental science and engineering problem, with ubiquitous presence in various applications. In this paper, we study the effect of imposing vertical and horizontal ultrasonic vibration (40 kHz) on dynamics (oscillations) and evaporation of sessile droplets of difnethylformamide (DMF), isopropyl alcohol (IPA) and water on Teflon and glass substrates. There is no or very few works considering dynamics and evaporation aspects of excited droplets, simultaneously. The theory concerning the force balance and pinning/depinning in pristine and excited sessile droplet systems is elucidated. Time varying left and right contact angles and contact radius are measured for the duration of the droplet lifetime, where the stick-slip phenomena are observed and interpreted for various liquids. Imposing substrate vibration results in significant decrease in droplet lifetime and affects the behavior of the stick-slip mechanism. Droplets excited by horizontal vibration have,the shortest lifetime. It is also experimentally shown that in the case of vertical vibration, the left and right contact angles oscillate in-phase, whereas in the case of horizontal vibration, there is 180 degrees phase difference between left and right contact angles. (C) 2017 Elsevier Ltd. All rights reserved.
    View publication