Induced liquid-solid contact via micronano multiscale texture on a surface and its effect on the Leidenfrost temperature.pdfVIP

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Induced liquid-solid contact via micronano multiscale texture on a surface and its effect on the Leidenfrost temperature.pdf

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Induced liquid-solid contact via micronano multiscale texture on a surface and its effect on the Leidenfrost temperature.pdf

Experimental Thermal and Fluid Science 84 (2017) 156–164 Contents lists available at ScienceDirect Experimental Thermal and Fluid Science journal homepage: /locate/etfs Induced liquid-solid contact via micro/nano multiscale texture on a surface and its effect on the Leidenfrost temperature Gi Cheol Lee a, Jun-young Kang b, Hyun Sun Park b,?, Kiyofumi Moriyama b, Seol Ha Kim c, Moo Hwan Kim a,b a Department of Mechanical Engineering, POSTECH, Pohang 790-784, Republic of Korea b Division of Advanced Nuclear Engineering, POSTECH, Pohang 790-784, Republic of Korea c Institute of Engineering Thermophysics, Chinese Academy of Science, Beijing 100190, China article info Article history: Received 8 July 2016 Received in revised form 22 November 2016 Accepted 29 January 2017 Available online 1 February 2017 Keywords: Leidenfrost temperature (LFT) Micro/nano multiscale texture Liquid precursor Micro roughness Induced liquid-solid contact Droplet rebound abstract A signi?cant increase in the Leidenfrost temperature (LFT) was observed on a micro/nano multiscale textured surface (MTS) compared with a polished surface (PS) and a micro rough surface (MRS). MTS was fabricated by anodic oxidation and has nano-scaled needles with micro roughness. It showed improved surface wetting characteristics (0° contact angle with liquid spreading). On the other hand, MRS was fabricated by mechanical polishing and it only has micro roughness. LFT on MTS and MRS increased by approximately 150 °C and 30 °C, respectively, compared with one for PS. The textures on each surface in?uenced the water droplet dynamics. The relationship between LFT and the dynamics of water droplet were studied by high-speed photography. The key phenomenon determining LFT was the rebound process of the droplet during a few milliseconds. On MRS and MTS, the rebound phenomenon of the droplet was disturbed by the surface-texture-induced liquid-solid contact even when the surface was initially at a high temperature over 300 °