Contact line friction of electrowetting actuated viscous droplets

We examine the contact line friction coefficient of viscous droplets spreading and retracting on solid surfaces immersed in ambient oil. By using the electrowetting effect, we generate a surface tension imbalance to drive the spreading and the retracting motion of the three-phase contact line (TCL)....

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ग्रंथसूची विवरण
मुख्य लेखकों: Vo, Quoc, Tran, Tuan
अन्य लेखक: School of Mechanical and Aerospace Engineering
स्वरूप: Journal Article
भाषा:English
प्रकाशित: 2018
विषय:
ऑनलाइन पहुंच:https://hdl.handle.net/10356/84743
http://hdl.handle.net/10220/45092
विवरण
सारांश:We examine the contact line friction coefficient of viscous droplets spreading and retracting on solid surfaces immersed in ambient oil. By using the electrowetting effect, we generate a surface tension imbalance to drive the spreading and the retracting motion of the three-phase contact line (TCL). We show that neither the driving force intensity nor TCL direction significantly influences the friction coefficient. Instead, the friction coefficient depends equivalently on the viscosity of liquid droplets and the surrounding oil. We derive and experimentally verify a transient timescale that can be used to characterize both the spreading and retracting dynamics.