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Effect of static contact angle on the droplet dynamics during the evaporation of a water droplet on the hot walls

机译:在热壁上蒸发水滴期间,静态接触角对液滴动力学的影响

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摘要

The effect of surface wettability on the collision dynamics and heat transfer phenomena of a single water droplet impacting upon a heated solid surface has been studied experimentally. To modify the surface wettability, two modules of stainless steel coated by TiO_2 were employed. The first module was induced by ultraviolet irradiation to produce the hydrophilic surface, while the second one was not. The diameter and the depth of coating surface were 30 mm and 200 nm, respectively. The droplet size was varied from 1.90 to 2.90 mm and substrate temperature raised up to 340 ℃. The interaction of an impact water droplet with a heated solid surface was investigated using a high-speed video camera. As a result, it was found that; (1) in the lower surface temperature region the evaporation time decreases as the static contact angle decreases, (2) the wetting limit temperature decreases with the increase of static contact angle, (3) the ultraviolet irradiation on the TiO_2 surface does not change the qualitative behavior of the evolution of wetting diameters, and (4) the maximum wetting diameter increases with the decrease of static contact angle below the wetting limit temperatures.
机译:实验研究了表面润湿性对单个水滴撞击加热的固体表面的碰撞动力学和传热现象的影响。为了改变表面润湿性,使用了两个用TiO_2涂层的不锈钢组件。通过紫外线照射诱导第一个模块产生亲水表面,而第二个模块则没有。涂层表面的直径和深度分别为30 mm和200 nm。液滴尺寸从1.90毫米到2.90毫米不等,基板温度升至340℃。使用高速摄像机研究了冲击水滴与加热的固体表面的相互作用。结果发现: (1)在较低的表面温度区域,蒸发时间随着静态接触角的减小而减少;(2)润湿极限温度随着静态接触角的增加而减小;(3)TiO_2表面上的紫外线照射不会改变(4)最大润湿直径随静态接触角在润湿极限温度以下的减小而增加。

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  • 作者单位

    Department of Mechanical & Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jalan Grafika No. 2, Yogyakarta 55281, Indonesia ,Centre for Energy Studies, Gadjah Mada University, Sekip K-1A Kampus UGM, Yogyakarta 55281, Indonesia;

    International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;

    International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;

    Department of Mechanical & Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jalan Grafika No. 2, Yogyakarta 55281, Indonesia ,Centre for Energy Studies, Gadjah Mada University, Sekip K-1A Kampus UGM, Yogyakarta 55281, Indonesia;

    Department of Mechanical & Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jalan Grafika No. 2, Yogyakarta 55281, Indonesia ,Centre for Energy Studies, Gadjah Mada University, Sekip K-1A Kampus UGM, Yogyakarta 55281, Indonesia;

    Department of Mechanical & Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jalan Grafika No. 2, Yogyakarta 55281, Indonesia ,Centre for Energy Studies, Gadjah Mada University, Sekip K-1A Kampus UGM, Yogyakarta 55281, Indonesia;

    Department of Mechanical & Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jalan Grafika No. 2, Yogyakarta 55281, Indonesia ,Centre for Energy Studies, Gadjah Mada University, Sekip K-1A Kampus UGM, Yogyakarta 55281, Indonesia;

    International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Wettability; Spray cooling; Wetting limit temperature; Ultraviolet irradiation; Droplet;

    机译:润湿性喷雾冷却;润湿极限温度;紫外线照射;水滴;

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