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contributor authorLu, Yi
contributor authorFang, Hui
contributor authorBao, Jiming
contributor authorLiu, Dong
date accessioned2017-11-25T07:16:54Z
date available2017-11-25T07:16:54Z
date copyright2017/5/6
date issued2017
identifier issn0022-1481
identifier otherht_139_08_080902.pdf
identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4234285
description abstractLeidenfrost phenomenon is closely related to film boiling and the critical heat flux (CHF) limit of boiling heat transfer. Understanding the mechanisms of Leidenfrost phenomenon and devising effective ways to suppress it is of great interest to the heat transfer enhancement community. In this work, a synchronized high-speed optical imaging and infrared (IR) thermography approach was employed to investigate the dynamics of a Leidenfrost droplet under the influence of electrowetting (EW). The Leidenfrost droplet was produced by dispensing a water drop on a Teflon-coated silicon wafer maintained at a wall temperature of Twall = 200 °C. Both direct-current (DC) and alternating-current (AC) electric fields were applied to induce EW effect to suppress the Leidenfrost state. The interfacial instabilities of the Leidenfrost droplet were observed, and the instantaneous temperature and heat flux distributions on the heating surface were measured. The results suggest that the electrical forces destabilize the liquid-vapor interface and cause the vapor film that insulates the heating surface from the droplet to collapse. Re-establishment of the liquid-solid contact helps to drastically improve the heat transfer, as evidenced by the reduced surface temperature and the enhanced heat flux.
publisherThe American Society of Mechanical Engineers (ASME)
titleDynamics of a Leidenfrost Droplet Modulated by Electrowetting
typeJournal Paper
journal volume139
journal issue8
journal titleJournal of Heat Transfer
identifier doi10.1115/1.4036876
journal fristpage80902
journal lastpage080902-6
treeJournal of Heat Transfer:;2017:;volume( 139 ):;issue: 008
contenttypeFulltext


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