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Development of Heat Transfer Surface using Superhydrophilic Photocatalyst

使用超亲水光催化剂开发传热表面

基本信息

批准号：
12555059
负责人：
TAKATA Yasuyuki
金额：
$ 6.08万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555059/
关键词：
Titanium dioxide Superhydrophilic Phase change Contact angle Boiling and evaporation UV Sputtering

项目摘要

The purpose of this research project is to develop an enhanced heat transfer surface making use of photo-induced superhydrophilicity of titanium dioxide. This heat transfer surface is expected to have excellent characteristics in liquid-vapor phase change heat transfer process because of extremely high wettability.We have examined the heat transfer characteristics of TiO_2-coated surfaces by the following experiments;(1) falling film evaporation around the horizontal cylinder(2) pool boiling: effect of wettability on critical heat flux (CHF) and minimum heat flux (MHF)(3) evaporation of water drop on hot surface irradiated by plasma(4) change in contact angle of plasma-re formed aluminum surfaceHigh wettability of surface enhances heat transfer in above all experiments. In experiment of water drop evaporation, the lifetime of water drop on hot surface decreases as the contact angle of the surface decreases. This indicates that the heat transfer can be enhanced significantly in spray cooling process. In addition, the wetting limit temperature and the Leidenfrost temperature increase by about 20K compared with the normal surface.The plasma-reformed surfaces have a surface structure of fractal configuration. It initially gives the nature of spreading wetting, but the contact angle gradually increases with time and finally reaches more than 150°, a super-water-repellent state. When the surface is irradiated by plasma at a certain contact angle, the surface returns to spreading wetting state. This phenomenon is unusual and the mechanism has not yet been clear.

本研究项目的目的是利用二氧化钛的光致超亲水性开发一种强化传热表面。该换热表面具有极高的润湿性，有望在液-气相变换热过程中具有优异的性能。我们通过以下实验研究了tio_2涂层表面的传热特性：(1)水平圆筒周围降膜蒸发(2)池沸腾：润湿性对临界热流密度（CHF）和最小热流密度（MHF）的影响(3)等离子体辐照热表面水滴的蒸发(4)等离子体重构铝表面接触角的变化。在水滴蒸发实验中，水滴在热表面上的寿命随着表面接触角的减小而减小。这表明喷淋冷却过程可以显著增强传热。润湿极限温度和莱顿弗罗斯特温度较正常表面提高了约20K。等离子体改造表面具有分形的表面结构。它最初具有扩散润湿的性质，但随着时间的推移，接触角逐渐增加，最终达到150°以上，达到超级拒水状态。当等离子体以一定的接触角照射表面时，表面恢复到扩散润湿状态。这种现象是不寻常的，其机制尚不清楚。

项目成果

期刊论文数量（84）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Yasuyuki Takata, et al.: "Effect of Surface Wettability on Boiling and Evaporation"Proceedings of the first Taiwan-Japan Workshop on Mechanical and Aerospace Engineering. 2. 623-634 (2001)

Yasuyuki Takata 等：“表面润湿性对沸腾和蒸发的影响”首届台日机械与航空航天工程研讨会论文集。

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Y.Takata, S.Hidaka, et al.: "Boiling and Evaporation from a Superhydrophilic Surface"Proceedings of the International Workshop on Current Status and Future Direction in Boiling Heat Transfer and Two-phase flow. 23-29 (2000)

Y.Takata、S.Hidaka 等人：“超亲水表面的沸腾和蒸发”沸腾传热和两相流的现状和未来方向国际研讨会论文集。

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高田保之,日高澄具,曹建明,増田正孝,伊藤猛宏,渡部俊也,下吹越光秀: "超親水表面の沸騰熱伝達"第37回日本伝熱シンポジウム. 445-446 (2000)

Yasuyuki Takada、Sumitomo Hidaka、Kenmei Cao、Masataka Masuda、Takehiro Ito、Toshiya Watanabe、Mitsuhide Shimofukikoshi：“超亲水表面上的沸腾传热”第 37 届日本传热研讨会 445-446（2000 年）。