Effect of surface wettability on boiling and evaporation
Effect of surface wettability on boiling and evaporation
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DOI：
10.1016/j.energy.2004.05.004
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发表时间：
2005-02-01
期刊：
影响因子：
9
通讯作者：
Ito, T
中科院分区：
文献类型：
--
作者：
Takata, Y;Hidaka, S;Ito, T
二氧化钛（TiO 2）是具有非常独特特性的光催化剂之一。涂覆有TiO 2的表面通过将表面暴露于UV光而对水表现出极高的亲和力，并且接触角几乎减小到零。恰恰相反。当表面被屏蔽UV光时，接触角增加。我们将这种超亲水性应用于强化沸腾和蒸发传热。通过单水滴的池沸腾和蒸发实验研究了高润湿性对换热特性的影响。在每个实验中，使用TiO 2涂层和未涂层表面进行比较。结果表明：（1）表面涂覆TiO 2后的临界热流密度（CHF）是未涂覆表面的2倍左右; Leidenfrost温度随接触角的减小而升高。超亲水表面可以是理想的传热表面。(C)2004 Elsevier Ltd.保留所有权利。
Titanium dioxide, TiO2, is one of the photocatalysts that has a very unique characteristic. The surface coated with TiO2 exhibits extremely high affinity for water by exposing the surface to UV light and the contact angle decreases nearly to zero. On the contrary. the contact angle increases when the surface is shielded from UV light. We applied this superhydrophilic nature to enhancement of boiling and evaporation heat transfer. Experiments of pool boiling and evaporation of single water droplet have been performed to manifest the effect of high wettability on heat transfer characteristics. Both of TiO2-coated and non-coated surfaces were used for comparison in each experiment. It is found that (1) the critical heat flux (CHF) of TiO2-coated surface is about two times larger than that of non-coated one. and (2) Leidenfrost temperature increases as the contact angle decreases. The superhydrophilic surface can be an ideal heat transfer surface. (C) 2004 Elsevier Ltd. All rights reserved.